I love the way my '84 Crossfire runs. I find it easy to work on; all you have to do is change out some old parts to breathe new life into them. You're right about the vacuum; I changed all my vacuum hoses, which made a huge difference. I then swapped out the fuel pump to one from an '85 to get more pressure. I got an MSD HE ignition system, which made it come to life. I keep it tuned, and it runs well. I don't need the '84 to have loads of HPs; I just need it to run nice and crisp, which it does.
My dad had a 1984 and it was my first car I got to drive. I liked it. I opened up the hood and I read crossfire injection I thought it was the shit myself. I had a blast driving it at 14...
Just bought an 84 with the factory crossfire still on it. The car has managed to not only go 218k miles with it, but it also got me from Baltimore, MD all the way back home on the Western side of West Virginia. A 6 hour trip one way! It did spit and sputter, but with some crossfire adjustments and a tune up, I'm sure it'll be back to business as usual!
The only thing wrong with the crossfire was people that never owned one talking bad about them. And don't forget the coolant temp sensor on the front of the intake was one of the biggest problems
Agree'd! I have always lovex this engine! People talk shit about a lot of stuff they don't understand just because they hear other people talking bad about it.
Good morning Anthony. Great video ! I have also heard folks cry and whine about the Crossfire system. I had a 1982 Corvette and for the years I had it I never had an issue. Mine ran great. I hope one day to have another '82. Thanks again my friend.
I had a 83 ta with the 305 cross fire. It ran really well, the other tbi engines just felt like it was starving for fuel, the cross fire ran way better
C3 Covette is the coolest looking Vette of all, and since they were caught in the low performance era they are relatively inexpensive. I am no mechanic, So I'm going to find a mechanic to help me track down a cream puff that I could bring to car shows and take out on weekends.
Nice video. I've been looking for a c3 or a c4 for awhile, but theres so much criteria to narrow down. I like these early cars more, because they're the cheapest and most hated.
Hey Like you video. Glad some one Really interested on the C4 '84 vette. Question; One of the injector terminal flashes the other don't through noid test. Anything I should look into. Also a easy tool to check the fuel pressure?
Hey what is wrong if you get it to start after using some engine starter and it starts but when you let off gas it dies if you know that would be awesome
What kind of vacuum pump do you use? If there is a leak in the vacuum lines that control the lights could that cause problems? My 1982 stalls out when I come to complete full stops I was told it might be my timing chain what do you think? Thanks for your video
84 was a whole different animal there is no vacuum that controls the headlights,as far as you're stalling it could be a lot of things EGR valve, timing and maybe a vacuum leak,I would definitely check the vacuum and the timing..
Headlights have Motors doesn't rely on vacuum on the C4 Corvettes,doesn't sound like a timing chain to me it sounds like a vacuum leak you have somewhere,is it possible somebody put a cam in that car and it's Robin your vacuum that's a possibility also..or it may just need a very good tune-up ignition wires so on and so on,if that all is good the first thing I would check is the EGR valve that's a strong possibility.........
I have an ‘84 and my car won’t run because one of the injectors will not fire. Changed the injector itself and the ECM driver is good. Not sure what else to go to. Put a noid light on it and it seems like it should be fine. Any tips?
Anthony I noticed in the video that above your Fan that you have a hole in the shroud did you cut that hole yourself and if so is it helping the car to get more cooler air circulating
i cut a hole in mine also. the 84 vette has a functioning cowl type hood. the hood has a hole in it also and the "bumps" in the hood are air ducts that go into the 2 holes on the air cleaner
yes I cut that out and it made a tremendous difference in the performance in the car,instead of sucking in hot air from the engine compartment it's breathing in nice fresh air from the front underneath,and I must say you are very observant......I don't think General Motors wanted to take a chance and doing that and taking a chance and clogging up the the ductwork that goes through the hood,you can't see it but on the hood I have a screen so nothing can fly in........if you look at 85 and up the tuned port engines they all bring in fresh air from the front.......
@@anthony84vette My thinking is they didn't want a problem with the EPA, which was a very anal retentive institution back during that time frame. It's easy to prevent clogging by putting in a screen between the radiator air box and the intake of the hood. Best to install on the bottom of the hood inlet.
Hello Anthony! Love my 84 corvette and everything you said is very true about the crossfire engine in the 84. I have one myself. I had some wiring replaced because of age. Have you ever had an issue we’re your digital dash and your headlights when on do a very small flicking at the same time? Not sure if it’s a wiring issue or maybe it’s time to check out the alternator.
I had the same issue with mine and what I did was I took the instrument panel apart it's kind of like a laptop and it's in two sections where it connect's there's a few pins clean the pins and put it back together,that's the most common issue,but again it could be the circuit board .....a lot of variables but flickering usually is those pins getting slightly corroded......
My 1984 crossfire Corvette won't accelerate when fully warmed up. Stalls out when I accelerate. Any solutions. I already changed fuel pump and sending unit plus fuel filter, spark plugs and wires and oil change
I’m about to buy an 84 vette with the CFI engine in it anything I should check for since it has a high mileage? It’s at 145k. I want to do an LS swap and add a turbo to it eventually but I need to fix it up cosmetically first it’s missing the toga and the right headlight.
@@gevara454 how many miles does yours have? My friend is selling it to me for $3,000 also but it has a lot of fucking miles!! A small price to pay to have this car in my garage when I’m old if I don’t die.
Hey Anthony i got my 84 for a year now and it was running fine until recently when i changed the idle air control valves and the idle went too high (1500-1700) i tried to adjust by driving (believing ecm will auto adjust but no luck) i then put the old iac valves back in ( which are a bit longer than new ones) and the idle went down a bit but still running high at 1200 especially after engine warmed up. I thought the coolant temp sensor was the problem and i changed it but still idle goes high when engine warmed up and now throws code 14 and 15. The wiring at the cts seemed a bit messed up so maybe that’s why the codes..? I also don’t have o2 sensor and no cats (in dubai i registered it as classic car) and my fuel economy is terrible. Although it’s a crossfire engine My set up is a bit different as there is no air box, but each tbi has its own air filter. (You can have a look on my channel) I think most vacuum lines are sorted or capped off so don’t think the vacuum is a problem. I rebuilt both TBIs, new fuel pump new fuel filter and new coolant temp sensor. What do you think the high idle is caused by? any suggestions?
@@georgehill99 well kinda, the car idles alright at the beginning starts at 1200 the drops to about 800, but then after some driving it goes back to 1200. I cleaned the idle control valves and tried adjusting throttle positioning sensor and it is still the same. I almost got used to it by now and almost forgot about it tbh. I do have a new throttle positioning sensor and maybe i should replace the old one, although i am thinking if my existing throttle positioning sensor is toast it would have even worse idle.? Anyway i might change it and see what happens..it’s weird that it really runs great for the first 10min then the idle goes up, but then again goes down after say 20min of driving..so some traffic stops i would have it at 1200 and some at 800. I tried playing with the throttle lever and when i push it down it does reduce the idle so almost as if it’s sticking somewhere. I also put a lot of lubricant in most throttle moving parts, but still the same.. go figure..
Most problem with the cross fire engine is balance the carbs with a manometer the two carb must be balance to run right and the throttle senor must be at reading at .035 volts every that it.
I had 84.5 with this motor, and guys would call it "cross-f*cked" injection, but I had 0 problems with it. Now, the electrical and cooling were sh*t, but nothing with the injection.
GM for what ever reason thought it was a good idea to have the fans come on around 235 to 240 degrees. I changed the t.stat and replaced the fan temp sensor in the passenger side head so the fan came on at 195 degrees. The big reason was because of the 624 heads they used were the lite casting and would crack if over heated.
I have a c 4 84 and it won't run but a quarter of a mile real good then it will die restart and runs like crap any suggestions I would love to drive hee
Imo the best thing you can do with a crossfire injection system is remove and swap it for a truck tbi system. All the wiring and connectors are the same. You just don't use one of the idle air controllers. The original system was a cobbled together mess.
I run a modded TBI on my 350 Monte Carlo and it does pretty well. I heard with the original design of the Crossfire it was too tall to fit under the Corvette hood, so they chopped in the intake manifold down. That probably went against every design and engineering concept and crippled it's potential.
@@intermissionbuffalo All I can say is every other successful tbi system has small plenums and short runners. In the case of GMs and some Fords they added swirl ports at the intake valve ports. Crossfire has none of that.
I am having all sorts of issues with my crossfire. I love my vette but I wish I could actually drive it. I’ve pulled the engine and trans and currently have an LS in it I snatched from a junkyard but I would love to put the original engine back at some point
I have 1984 corvette 4+3 transmission, my knock sensor wire melted, I fixed that, now engine will turn, but won’t start. Car has been sitting for 4-5 months. Any idea on what to check for? I replaced spark module in distributor, and spark control module. Any help would be good. Thank you.
will a vacuum leak cause a misfire when cold and it to steam out of the tail pipe smart idea on letting someone else take the hit on the price drop on the c8 lol
hello! Anthony I have a question I got my 84 running after changing the fuel pump and assembly twice the second time for some reason water got in to the fuel tank anyway I was changing the driver side window felt I forgot to disconnect the battery when I was removing the connectors around the door I heard clicking by the engine bay I replace the fuel relay and check the fuse it cranks the engine but it wont idle no fuel delivery I disconnect the battery overnight several times hoping that it will reboot the computer still the same there is a "check engine" sign "security" the vette starts and runs before that clicking.
Cease fire? Ah, you must not know a thing about it, much less probably never driven one, worked on one, or seen under the hood of one. Thanks for making it public! 👍
Hey man I have a red 1984 Corvette it's pretty old and I've started to work on it but I'm having a issue starting up and when it starts up it idles really high and when I got to adjust it the idle gets very low and then turns off any ideas on what I need or might haft to do
I would say 95% change the idle control valve on each throttle body to start..especially if it settles down after a while I would say 99% is the idle control valve...f you don't want to spend a lot of money you can go on eBay and get the cheap ones for $10 each and if it works out later you can buy the better ones..Good luck....by the way on these Crossfire injections you cannot adjust the idle,if something is slightly out the ECM will try to correct it with the fuel management and try to get the idol correctly 6 to 800 RPM
@@jeremyquinlan336 If you were “rebuilding” the injectors every oil change, it is no fault of the Crossfire Injection system. I have put well over 100k miles on my Crossfire cars and daily drive an 83 LU5. Any problem I have ever had with any of my 16 thirdgen F-bodies, none of them were related to CFI.
@LosCadaver Based on what? Your inability to keep one running flawlessly? Did that ridiculously simple 40 year old ECM and Injection system outsmart you?
I love the way my '84 Crossfire runs. I find it easy to work on; all you have to do is change out some old parts to breathe new life into them. You're right about the vacuum; I changed all my vacuum hoses, which made a huge difference. I then swapped out the fuel pump to one from an '85 to get more pressure. I got an MSD HE ignition system, which made it come to life. I keep it tuned, and it runs well. I don't need the '84 to have loads of HPs; I just need it to run nice and crisp, which it does.
My dad had a 1984 and it was my first car I got to drive. I liked it. I opened up the hood and I read crossfire injection I thought it was the shit myself. I had a blast driving it at 14...
Thats sick man, my dad had an 87 foxbody and man i wish he kept that for me to have :( had to get rid of it when i was like 2
Just made me feel great about my purchase. Thank you, sir.
Just bought an 84 with the factory crossfire still on it. The car has managed to not only go 218k miles with it, but it also got me from Baltimore, MD all the way back home on the Western side of West Virginia. A 6 hour trip one way! It did spit and sputter, but with some crossfire adjustments and a tune up, I'm sure it'll be back to business as usual!
The only thing wrong with the crossfire was people that never owned one talking bad about them. And don't forget the coolant temp sensor on the front of the intake was one of the biggest problems
Agree'd! I have always lovex this engine! People talk shit about a lot of stuff they don't understand just because they hear other people talking bad about it.
@@silverwings11035 The same thing go for ecoboost engines. My 2016 has 80k miles and my turbos are both good.
@@blackericdenice what stuff do they say about it?
Never have a problem with the coolant temp sensor. 365k miles.
@@blackericdenice Talked to a gentleman yesterday who had 165k on his original ecoboost turbos.
Good morning Anthony. Great video ! I have also heard folks cry and whine about the Crossfire system. I had a 1982 Corvette and for the years I had it I never had an issue. Mine ran great. I hope one day to have another '82. Thanks again my friend.
I had a 83 ta with the 305 cross fire. It ran really well, the other tbi engines just felt like it was starving for fuel, the cross fire ran way better
Thank you! Straight changed my mind about mine. Valid video
C3 Covette is the coolest looking Vette of all, and since they were caught in the low performance era they are relatively inexpensive. I am no mechanic, So I'm going to find a mechanic to help me track down a cream puff that I could bring to car shows and take out on weekends.
I don't know about you, but my first C3 was a 427 4spd roadster....no "low performance" at all.
C3s are hideous. Buy a real vette
Thank you for this vid man 🙏
I am partial to the crossfire
Air cleaner
Great video!
Nice video. I've been looking for a c3 or a c4 for awhile, but theres so much criteria to narrow down. I like these early cars more, because they're the cheapest and most hated.
“...Most hated”
I love it!
My 84 c4 corvette “works perfectly “ & still get 23 miles to the gallon!!!!
Is it beneficial to cutting a hole in the fan shroud to allow more air to get into the engine department
Hey Like you video. Glad some one Really interested on the C4 '84 vette. Question; One of the injector terminal flashes the other don't through noid test. Anything I should look into. Also a easy tool to check the fuel pressure?
thank you I will try the position sensor and I C valve
Hey what is wrong if you get it to start after using some engine starter and it starts but when you let off gas it dies if you know that would be awesome
Thanks
What kind of vacuum pump do you use? If there is a leak in the vacuum lines that control the lights could that cause problems? My 1982 stalls out when I come to complete full stops I was told it might be my timing chain what do you think? Thanks for your video
84 was a whole different animal there is no vacuum that controls the headlights,as far as you're stalling it could be a lot of things EGR valve, timing and maybe a vacuum leak,I would definitely check the vacuum and the timing..
Anthony thank you for replying 👍🙏
I'm having trouble rough italling 84cross fire injection Tony h
Headlights have Motors doesn't rely on vacuum on the C4 Corvettes,doesn't sound like a timing chain to me it sounds like a vacuum leak you have somewhere,is it possible somebody put a cam in that car and it's Robin your vacuum that's a possibility also..or it may just need a very good tune-up ignition wires so on and so on,if that all is good the first thing I would check is the EGR valve that's a strong possibility.........
I have an ‘84 and my car won’t run because one of the injectors will not fire. Changed the injector itself and the ECM driver is good. Not sure what else to go to. Put a noid light on it and it seems like it should be fine. Any tips?
Anthony I noticed in the video that above your Fan that you have a hole in the shroud did you cut that hole yourself and if so is it helping the car to get more cooler air circulating
i cut a hole in mine also. the 84 vette has a functioning cowl type hood. the hood has a hole in it also and the "bumps" in the hood are air ducts that go into the 2 holes on the air cleaner
yes I cut that out and it made a tremendous difference in the performance in the car,instead of sucking in hot air from the engine compartment it's breathing in nice fresh air from the front underneath,and I must say you are very observant......I don't think General Motors wanted to take a chance and doing that and taking a chance and clogging up the the ductwork that goes through the hood,you can't see it but on the hood I have a screen so nothing can fly in........if you look at 85 and up the tuned port engines they all bring in fresh air from the front.......
@@anthony84vette nice call on the screen idea might have to use that
@@anthony84vette My thinking is they didn't want a problem with the EPA, which was a very anal retentive institution back during that time frame. It's easy to prevent clogging by putting in a screen between the radiator air box and the intake of the hood. Best to install on the bottom of the hood inlet.
Hello Anthony! Love my 84 corvette and everything you said is very true about the crossfire engine in the 84. I have one myself. I had some wiring replaced because of age. Have you ever had an issue we’re your digital dash and your headlights when on do a very small flicking at the same time? Not sure if it’s a wiring issue or maybe it’s time to check out the alternator.
Check the throttle position sensor it should read voltage of .525 to idle properly.
I had the same issue with mine and what I did was I took the instrument panel apart it's kind of like a laptop and it's in two sections where it connect's there's a few pins clean the pins and put it back together,that's the most common issue,but again it could be the circuit board .....a lot of variables but flickering usually is those pins getting slightly corroded......
Hits blunt every time he said you know and is it just me or dose he sound like tony from purgatony
My 1984 crossfire Corvette won't accelerate when fully warmed up. Stalls out when I accelerate. Any solutions. I already changed fuel pump and sending unit plus fuel filter, spark plugs and wires and oil change
I’m about to buy an 84 vette with the CFI engine in it anything I should check for since it has a high mileage? It’s at 145k. I want to do an LS swap and add a turbo to it eventually but I need to fix it up cosmetically first it’s missing the toga and the right headlight.
I am also about to buy one how much are they asking for yours for mine is 3000 and it looks in good shape I just drove it today
@@gevara454 how many miles does yours have? My friend is selling it to me for $3,000 also but it has a lot of fucking miles!! A small price to pay to have this car in my garage when I’m old if I don’t die.
Hey Anthony i got my 84 for a year now and it was running fine until recently when i changed the idle air control valves and the idle went too high (1500-1700) i tried to adjust by driving (believing ecm will auto adjust but no luck) i then put the old iac valves back in ( which are a bit longer than new ones) and the idle went down a bit but still running high at 1200 especially after engine warmed up. I thought the coolant temp sensor was the problem and i changed it but still idle goes high when engine warmed up and now throws code 14 and 15. The wiring at the cts seemed a bit messed up so maybe that’s why the codes..? I also don’t have o2 sensor and no cats (in dubai i registered it as classic car) and my fuel economy is terrible. Although it’s a crossfire engine My set up is a bit different as there is no air box, but each tbi has its own air filter. (You can have a look on my channel) I think most vacuum lines are sorted or capped off so don’t think the vacuum is a problem.
I rebuilt both TBIs, new fuel pump new fuel filter and new coolant temp sensor. What do you think the high idle is caused by? any suggestions?
Did you figure it out?
@@georgehill99 well kinda, the car idles alright at the beginning starts at 1200 the drops to about 800, but then after some driving it goes back to 1200. I cleaned the idle control valves and tried adjusting throttle positioning sensor and it is still the same. I almost got used to it by now and almost forgot about it tbh. I do have a new throttle positioning sensor and maybe i should replace the old one, although i am thinking if my existing throttle positioning sensor is toast it would have even worse idle.? Anyway i might change it and see what happens..it’s weird that it really runs great for the first 10min then the idle goes up, but then again goes down after say 20min of driving..so some traffic stops i would have it at 1200 and some at 800. I tried playing with the throttle lever and when i push it down it does reduce the idle so almost as if it’s sticking somewhere. I also put a lot of lubricant in most throttle moving parts, but still the same.. go figure..
@@georgehill99 i have a last video on the idling issue so i would appreciate if you have a look and see if you can figure it out..
Vacuum leak
Most problem with the cross fire engine is balance the carbs with a manometer the two carb must be balance to run right and the throttle senor must be at reading at .035 volts every that it.
I had 84.5 with this motor, and guys would call it "cross-f*cked" injection, but I had 0 problems with it. Now, the electrical and cooling were sh*t, but nothing with the injection.
GM for what ever reason thought it was a good idea to have the fans come on around 235 to 240 degrees. I changed the t.stat and replaced the fan temp sensor in the passenger side head so the fan came on at 195 degrees. The big reason was because of the 624 heads they used were the lite casting and would crack if over heated.
Putting an Edelbrock cam, intake manifold, and sniper EFI on mine
I have a c 4 84 and it won't run but a quarter of a mile real good then it will die restart and runs like crap any suggestions I would love to drive hee
Imo the best thing you can do with a crossfire injection system is remove and swap it for a truck tbi system. All the wiring and connectors are the same. You just don't use one of the idle air controllers. The original system was a cobbled together mess.
I run a modded TBI on my 350 Monte Carlo and it does pretty well. I heard with the original design of the Crossfire it was too tall to fit under the Corvette hood, so they chopped in the intake manifold down. That probably went against every design and engineering concept and crippled it's potential.
@@intermissionbuffalo All I can say is every other successful tbi system has small plenums and short runners. In the case of GMs and some Fords they added swirl ports at the intake valve ports. Crossfire has none of that.
my crossfire has been extremely reliable
My 84 c4 corvette works perfectly & still get 23 miles to the gallon & with only 74,453.4 miles no it
I am having all sorts of issues with my crossfire. I love my vette but I wish I could actually drive it. I’ve pulled the engine and trans and currently have an LS in it I snatched from a junkyard but I would love to put the original engine back at some point
I have 1984 corvette 4+3 transmission, my knock sensor wire melted, I fixed that, now engine will turn, but won’t start. Car has been sitting for 4-5 months. Any idea on what to check for? I replaced spark module in distributor, and spark control module. Any help would be good. Thank you.
Check to see if you even have fuel pump pressure
Also see if you have any spark
Is there a possible way we could get in contact I really would need help with my engine.
Chrysler made their CrossRam work. This is still a wet intake, just computer controlled. Should work.
Very Good!... #89 ✝ {9-7-2023}
Where are you getting the nomenclature for testing everything.
New York dialect
Eckler's Corvettes has a lot of tests for all these sensors and relays
will a vacuum leak cause a misfire when cold and it to steam out of the tail pipe smart idea on letting someone else take the hit on the price drop on the c8 lol
hello! Anthony I have a question I got my 84 running after changing the fuel pump and assembly twice the second time for some reason water got in to the fuel tank anyway I was changing the driver side window felt I forgot to disconnect the battery when I was removing the connectors around the door I heard clicking by the engine bay I replace the fuel relay and check the fuse it cranks the engine but it wont idle no fuel delivery I disconnect the battery overnight several times hoping that it will reboot the computer still the same there is a "check engine" sign "security" the vette starts and runs before that clicking.
Lets discuss image stabilization :-)
Good old Cease Fire Injection 🔥
Cease fire? Ah, you must not know a thing about it, much less probably never driven one, worked on one, or seen under the hood of one. Thanks for making it public! 👍
@@Joesmusclecargarage uh-huh 🙄
You thought you ate with that shit huh
Can someone tell me how much horsepower this engine makes?
205hp
The computer was the main problem with CFI. I know this because TBI had the same problem but less of the time.
Hey man I have a red 1984 Corvette it's pretty old and I've started to work on it but I'm having a issue starting up and when it starts up it idles really high and when I got to adjust it the idle gets very low and then turns off any ideas on what I need or might haft to do
I would say 95% change the idle control valve on each throttle body to start..especially if it settles down after a while I would say 99% is the idle control valve...f you don't want to spend a lot of money you can go on eBay and get the cheap ones for $10 each and if it works out later you can buy the better ones..Good luck....by the way on these Crossfire injections you cannot adjust the idle,if something is slightly out the ECM will try to correct it with the fuel management and try to get the idol correctly 6 to 800 RPM
Great stuff and information but so Shakey it made me dizzy
30hp is significant just saying.
Problem is you can’t get higher than 4000rpm from it if you have a modified engine you won’t get top performance
Plus they are worth far less then tune port
I’m only 14 but I think I can manage it just need some help
This guy definitely sounds like a used car salesman from the 80s in New York....😅
It’s not that we don’t understand it… if it made any power we’d all have been experts on it. It’s a dog, a wet stinky dog
4 minutes in waiting for you to get to the point holy shit man
They really are junk, you can’t compare it to tune port that never breaks
Zero information here
Its a terrible system
I just bought a spreadbore edelbrock and a Qjet carb for my 83 z28, tired of rebuilding the injectors every oil change
@@jeremyquinlan336 If you were “rebuilding” the injectors every oil change, it is no fault of the Crossfire Injection system. I have put well over 100k miles on my Crossfire cars and daily drive an 83 LU5. Any problem I have ever had with any of my 16 thirdgen F-bodies, none of them were related to CFI.
@LosCadaver Based on what? Your inability to keep one running flawlessly? Did that ridiculously simple 40 year old ECM and Injection system outsmart you?