i literally just commented on your spark plug vid. man ihave the same hard shift and its so bad. thought the trans was bad and the truck wasnt worth putting another dollar into. this is a game changer
Lol yeah main reason I had bought the truck with a good deal was because it had a bad trans supposedly an sat for 20 years an didn't run Either . which the videos are on the channel of me bringing it home you'll havw to check out! Long story short was told trans slipped bad in 2nd-3rd gear but what happened it ended up being 3 or so quarts low an after that it was good again besides the jerking an slaming that started . An come find out ecm was bad
Hi! I want to thank you for this video, it solved my transmission hard shift problems. I installed a new ECM in 15 minutes. The mechanic who installed the transmission didn't know what was wrong. Thank you so much!!!!!
Hey man, my 93 s10 tahoe, 4.3 v6 does the same exact thing when shifting from 1st to 2nd. Every once in a while, when I start down the road early in the morning, the engine light comes on and...I don't know the best way to describe it, but it revs up really really high before kicking like a mule into 2nd. What I do is park it and unhook the battery for about 5 minutes and then hook it back up and it works fine. It only does it if I drive to my mother in laws the afternoon before which is about 80 ish miles extra on my regular commute. After I let the battery sit unhooked and head to work, I notice the hard shift isn't near as bad. I know this is a long ass post lol but I was wondering if you had any idea.
Yeah probably same issues then as I had . However cause u drove 80 some miles the computer does a drive has every vehicle does after it's reset and it takes at least 50 miles to complete . so whenever you have driven that far it's done went and completed everything that it checks and that's usally when u start to see the issues happen and usually it will detect it and throw the light on giving the code for whatever it finds wrong. But if your not getting codes then not sure could be a bad shift solenoid
My truck is a 91 4.3 v6 Tahoe and has the rough first to second shift I’m gonna buy an ecm off rock auto and swap it hoping this fixes shifting aswell as other dash gauge problems.
@@KnuckleHeadGarage27 lol if only I knew the trouble I was getting into. I bough this truck off it’s second owner papers to prove it. Haven’t don’t a lot of mechanical work in the past but this truck is pretty good too learn on. The guy used an oil filter relocation kit and now it’s right behind the driver headlight aswell. All sorts of random shit he made my life a struggle lol
When you asked or said you're not sure what that brown wire with the plug was. It's almost in a location where it would be for setting the ignition timing. My trucks and 93 and there's a brown wire tucked up underneath that wire bundle and when you set the ignition timing you unplug that wire first and then after setting the ignition timing where it's supposed to be you plug that wire back in so it can communicate with the computer. Then of course would have to be the other end of that wire very close by. Maybe the 94s are different?
That prom chip is made for that Pacific vehicle like has all the data an info an emissions stuff . I don't know how that would react with a different chip in it
Maybe post this video again with a new title fixing hard shift Chevy S10? Thanks for the awesome video my hard shifting Chevy is shifting smooth as silk again 👍
Any help you could offer in getting the new ECM back in place would be appreciated as I have spent hours trying to find the spot where it should sit. How hard do you have to push on the ECM to get seated. I should have felt the location before dropping it but I didn't and no matter where I try to position the ECM, it won't go. I thought I would just pull the glove box to be able to position the ECM, only to find that the glove box is molded to the rest of the dash. Thanks for any help.
Okay there is two little black studs that are rubber on the end of that computer at least most of them for the S10 they have to pop into the little inserts up under the dash you should see it or you should feel it with your hand as you put the computer up in there you may have to lay down and look under the dash because that's the way I had to do it.
affter trying 2 junkyard computers and getting no results what made you keep thinking it was the computer and not the trans? What exactly goes wrong in the computer that causes shifting problems?
This actually had more issues than just trans shifting hard and codes for it . The coolant temperature sensor and 2 knock sensors kept throwing codes for them which after replacing them it still kepg throwing codes and the truck ran terribly. So after all of that and replaced the computer it was fixed and also fixed the transmission codes and issues
Thank you for the reply. After asking for your help, I was able to get the ECM back in place. I did finally feel the bracket and gain some understanding how it works. I did not feel any rubber tipped supports on my truck. One problem on my truck was an HVAC control cable was partially blocking the location and catching the ECM when trying to seat it. Another thing that may have been helpful was to remove the two 10 mm bolts on the bottom of the dash, one by the passenger side door and one over to the left about 18 inches to allow the dash to come slightly forward. I have removed these bolts to replace the heater core before and now I see that it is leaking again during this ECM drop and reinstall process. Thanks again.
Yes it did I complety went threw the throttle body an rebuilt it an also new pcv hose an pcv valve an it's fixed . Before it had so much carbon built up inside the throttle body an the pcv valve cause a vacuum leak an had a rattling sound
@@KnuckleHeadGarage27 yeah im on the same boat right now. Ill probably end up having to dismantle the whole motor assembly. Seems my pcv grommet from the manifold gasket is allowing the valve to lock in place. So im kinda stumped. Plus my vapor canister is a complete mess.
No it was connected. The truck had transmission codes and engine codes for coolant temp sensor and the knock sensor. But as shown in video after I replaced the ecm computer an the truck was prefect and fixed all issues gone
@@KnuckleHeadGarage27 I'm having an issue with my gauges not working. I've changed all the sensors, checked continuity on the pcb to gauges, applied power directly to the stock gauges to make sure they work and checked the wiring harness (with multimeter) that goes in to the pcb and i still cant get my gauges to work. Any advice?
@@sjinvicta sounds like a bad cluster then if u can make them actually move at all when you ground them at the connector on the engine . Is the key on an engine off correct when you do these test ?
Yeah that was tricky I actually thought it was a bad shift solenoid or a real dirty valve body inside the trans . But I remembered before the engine gave me problems that the trans shifted fine but engine ran like ooo an then I put a computer in it from junkyard an it fixed the engine problems just gave me transmission problems lol .
Hi I have a 93 s10 could the Ecu make my blinkers stop flashing … still working but won’t flash ..Also I’ve had to replace the Transmission because I couldn’t go past 30mph at one point.. The new transmission has 100k on it and still shifts hard in first gear … Could that be a possible default from faulty Ecu? This is my first Chevy every so I’m kind of new to this Any advice is Appreciated Ty.
Okay alot been done so hard to narrow it down . Is the fluid full an clean an not burnt an if it checks out then could be the shift solenoid . But could be the ecm that's hard ti say
@@KnuckleHeadGarage27 The only reason I’m questioning that it could be the ECM is because the new transmission at one point started to not switch gears like the old one did before I changed it. And the blinker issue seems to me to be a red flag as well
@@KnuckleHeadGarage27 yeah I have to go through the wires more thoroughly .I was working on it today discounted the firewall box and noticed the electric connectors and terminals were full of gunk so I cleaned it with some CRC QD Electronic Cleaner.still reading at 8.9v crank no start
This one doesn't have a kickdown cable or TV cable for the transmission and I thought I had mentioned that . But this being a 93 it has a 4l60E trans so it doesn't use one to shift the gears that's all Computer controlled an using the TPS to get readings from to tell the computer how far open the throttle or closed . Kept throwing codes for bad shift solenoids and I was about to commit replacing those however that was never the issue after all it was only just a computer of course the truck had other issues besides transmission and it fixed it all after replacing the Bad ECM
I have a 95 astro van vin#W. No codes but the thing runs like hell. In drive it wants to die (idles like a dragster)and if the air is on. Low power on low end then all of a sudden it takes off like a new engine. It aldo has a hard shift into second. It throws your head back. Ive replaced most sensors and now im pulling my hair out without answers. The only difference between your truck symptoms and mine are the codes. Im not getting codes but ot sure seems like i should be. Thanks for the video. This is a real help for people with limited resources. Great job buddy.
And if it does light up when you turn the key on then more than likely it could be the computer. If it was me I would go to the junkyard find another van exactly like yours same setup it has to be exactly like yours. Like auto trans an if it's 4×4 or not an at least the same date when made like urs is a 95 so at least make sure to have a 95 computer an if it has cruise control or not . Cause all of the different things goes into play but if u can find one at junkyard an everything is the same . I try it an see how it acts it wouldn't hurt an if nothing changes then could be just another bad ECM or something else
@@KnuckleHeadGarage27 yes when the key is on the service engine soon light comes on constant. When started it turns off. I have replaced many sensors including TPS, IAC, EGR, O2 SENSOR, FUEL PRESSURE REGULATOR,FUEL FILTER, PCV VALVE AND GROMIT, AIR FILTER, FUEL RELAYS, CARBON CLEANED PLENUM, INTAKE PLENUM GASKET MAP(twice, the first MAP from auto zone had a vacuum leak brand new🤦) and now im thinking of testing the new IAC VAVLE, because auto zone has broken new parts too often🤷. After that im thinking new computer. After that im gonna put a grenade in it and watch it burn lol.
I’ve been having this problem where it’ll idle up and down I’ve changed iac map tps punched out the cat, it ran perfectly fine yesterday today it’s up down and up and down sounds like it’s idling poorly
Sounds like you have a vacuum leak or something somewhere also one thing to remember new part isn't always the fix. An sometimes new parts are bad when they're brand-new out of the box .
It’s ran great for a week , started this morning it didn’t have the problem start it up again to go to lunch it’s idling up and down and acting like a dead pedal when you move from a stop
So this is what it does, takes about 3 reps of the motor spinning then it’ll fire over, then it’ll decline idle , then stop hood idle for about 3 seconds then it’ll dip down and up with idle like a surge. Then you put it in gear it still will do the surge you press on the gas a little and it’ll act like it’s gonna die then wake up and fry the tires off cause you gave it more pedal afraid it was gonna stall, if you give it the whole pedal it’ll pull of it. Seems like it lost power and you can feel just sitting in gear it’s not running right
i literally just commented on your spark plug vid. man ihave the same hard shift and its so bad. thought the trans was bad and the truck wasnt worth putting another dollar into. this is a game changer
Lol yeah main reason I had bought the truck with a good deal was because it had a bad trans supposedly an sat for 20 years an didn't run Either . which the videos are on the channel of me bringing it home you'll havw to check out!
Long story short was told trans slipped bad in 2nd-3rd gear but what happened it ended up being 3 or so quarts low an after that it was good again besides the jerking an slaming that started . An come find out ecm was bad
Hi! I want to thank you for this video, it solved my transmission hard shift problems. I installed a new ECM in 15 minutes. The mechanic who installed the transmission didn't know what was wrong. Thank you so much!!!!!
You are very welcome glad I helped out!
Hey man, my 93 s10 tahoe, 4.3 v6 does the same exact thing when shifting from 1st to 2nd. Every once in a while, when I start down the road early in the morning, the engine light comes on and...I don't know the best way to describe it, but it revs up really really high before kicking like a mule into 2nd. What I do is park it and unhook the battery for about 5 minutes and then hook it back up and it works fine. It only does it if I drive to my mother in laws the afternoon before which is about 80 ish miles extra on my regular commute. After I let the battery sit unhooked and head to work, I notice the hard shift isn't near as bad. I know this is a long ass post lol but I was wondering if you had any idea.
Yeah probably same issues then as I had . However cause u drove 80 some miles the computer does a drive has every vehicle does after it's reset and it takes at least 50 miles to complete . so whenever you have driven that far it's done went and completed everything that it checks and that's usally when u start to see the issues happen and usually it will detect it and throw the light on giving the code for whatever it finds wrong.
But if your not getting codes then not sure could be a bad shift solenoid
My truck is a 91 4.3 v6 Tahoe and has the rough first to second shift I’m gonna buy an ecm off rock auto and swap it hoping this fixes shifting aswell as other dash gauge problems.
May not fix the other gauge problems those are mechanical it's either a sensors or the cluster or the wiring to them
@@KnuckleHeadGarage27 lol if only I knew the trouble I was getting into. I bough this truck off it’s second owner papers to prove it. Haven’t don’t a lot of mechanical work in the past but this truck is pretty good too learn on. The guy used an oil filter relocation kit and now it’s right behind the driver headlight aswell. All sorts of random shit he made my life a struggle lol
@@codysimmonds2944 Goodness yeah the 4×4 s10s had that oil filter relocation behind the driver side headlight . So probably where he got it from
When you asked or said you're not sure what that brown wire with the plug was. It's almost in a location where it would be for setting the ignition timing.
My trucks and 93 and there's a brown wire tucked up underneath that wire bundle and when you set the ignition timing you unplug that wire first and then after setting the ignition timing where it's supposed to be you plug that wire back in so it can communicate with the computer. Then of course would have to be the other end of that wire very close by.
Maybe the 94s are different?
Yeah I know about the wire under the dash my 92 S10 2.8 had it in my 85 S10 has it
How do you get a new prom? Can you use the prom from the same make and model?
That prom chip is made for that Pacific vehicle like has all the data an info an emissions stuff .
I don't know how that would react with a different chip in it
Maybe post this video again with a new title fixing hard shift Chevy S10? Thanks for the awesome video my hard shifting Chevy is shifting smooth as silk again 👍
Any help you could offer in getting the new ECM back in place would be appreciated as I have spent hours trying to find the spot where it should sit. How hard do you have to push on the ECM to get seated. I should have felt the location before dropping it but I didn't and no matter where I try to position the ECM, it won't go. I thought I would just pull the glove box to be able to position the ECM, only to find that the glove box is molded to the rest of the dash. Thanks for any help.
Okay there is two little black studs that are rubber on the end of that computer at least most of them for the S10 they have to pop into the little inserts up under the dash you should see it or you should feel it with your hand as you put the computer up in there you may have to lay down and look under the dash because that's the way I had to do it.
affter trying 2 junkyard computers and getting no results what made you keep thinking it was the computer and not the trans? What exactly goes wrong in the computer that causes shifting problems?
This actually had more issues than just trans shifting hard and codes for it . The coolant temperature sensor and 2 knock sensors kept throwing codes for them which after replacing them it still kepg throwing codes and the truck ran terribly.
So after all of that and replaced the computer it was fixed and also fixed the transmission codes and issues
Thank you for the reply. After asking for your help, I was able to get the ECM back in place. I did finally feel the bracket and gain some understanding how it works. I did not feel any rubber tipped supports on my truck. One problem on my truck was an HVAC control cable was partially blocking the location and catching the ECM when trying to seat it. Another thing that may have been helpful was to remove the two 10 mm bolts on the bottom of the dash, one by the passenger side door and one over to the left about 18 inches to allow the dash to come slightly forward. I have removed these bolts to replace the heater core before and now I see that it is leaking again during this ECM drop and reinstall process. Thanks again.
Yeah some S10s had a lower black plastic piece that bolts to bottom part of the dash that you have to remove and some don't
Hey man good vid. I got a 93 s10 4.3L. Has your pcv valve given you any problems?
Yes it did I complety went threw the throttle body an rebuilt it an also new pcv hose an pcv valve an it's fixed .
Before it had so much carbon built up inside the throttle body an the pcv valve cause a vacuum leak an had a rattling sound
@@KnuckleHeadGarage27 yeah im on the same boat right now. Ill probably end up having to dismantle the whole motor assembly. Seems my pcv grommet from the manifold gasket is allowing the valve to lock in place. So im kinda stumped. Plus my vapor canister is a complete mess.
That was your electronic timing unpluged and needs to be pluged in to get better perfomance
No it was connected. The truck had transmission codes and engine codes for coolant temp sensor and the knock sensor. But as shown in video after I replaced the ecm computer an the truck was prefect and fixed all issues gone
Thank you so much for doing a fantastic video.
Ive been looking for that dam ecm for a week. Thank you again outstanding!!!
No problem glad I could help out
Try finding one for a 1988 S10 2.5L Iron Duke. I found one…but took a while!
03 Silverado cranks, no start. Could it be the ECM? Where is mine located? Tried lots other parts
That could be anything .
However the ecm should be under the hood on those if not mistaken
@@johnscreekmarkyep trying to find one for my ‘86 2.5
could a bad ecm make the guages not work properly?
Mmm I would say no that it would be a sensor on engine or the cluster or an wireing to it . That would cause the gauges to not work
@@KnuckleHeadGarage27 I'm having an issue with my gauges not working. I've changed all the sensors, checked continuity on the pcb to gauges, applied power directly to the stock gauges to make sure they work and checked the wiring harness (with multimeter) that goes in to the pcb and i still cant get my gauges to work. Any advice?
@@sjinvicta sounds like a bad cluster then if u can make them actually move at all when you ground them at the connector on the engine . Is the key on an engine off correct when you do these test ?
clean the connectors for your dimmer switch if its the lights not working
Awesome Repair To Think a computer was the issue, The S10 is one fie truck I think the blazer uhas the same motor as the 1993
Yeah that was tricky I actually thought it was a bad shift solenoid or a real dirty valve body inside the trans . But I remembered before the engine gave me problems that the trans shifted fine but engine ran like ooo an then I put a computer in it from junkyard an it fixed the engine problems just gave me transmission problems lol .
Clean looking motor
Thanks definitely has came a long way since the day I bought it .
I need my changed. Where can I go get it programmed?
The ECM comes pre-programded when you buy it from parts store
Hi I have a 93 s10 could the Ecu make my blinkers stop flashing … still working but won’t flash ..Also I’ve had to replace the Transmission because I couldn’t go past 30mph at one point.. The new transmission has 100k on it and still shifts hard in first gear … Could that be a possible default from faulty Ecu? This is my first Chevy every so I’m kind of new to this Any advice is Appreciated Ty.
Okay alot been done so hard to narrow it down . Is the fluid full an clean an not burnt an if it checks out then could be the shift solenoid . But could be the ecm that's hard ti say
@@KnuckleHeadGarage27 The only reason I’m questioning that it could be the ECM is because the new transmission at one point started to not switch gears like the old one did before I changed it. And the blinker issue seems to me to be a red flag as well
Hmm interesting coukd be the ECM then not sure on that .
I’m getting low voltage to my fuel pump .I wonder if this would fix it?
Maybe but could be a break or some bad place in the wireing from the front to rear that has rubbed somewhere causing u to drop voltage like that
@@KnuckleHeadGarage27 yeah I have to go through the wires more thoroughly .I was working on it today discounted the firewall box and noticed the electric connectors and terminals were full of gunk so I cleaned it with some CRC QD Electronic Cleaner.still reading at 8.9v crank no start
Adjust the TV cable for the transmission
This one doesn't have a kickdown cable or TV cable for the transmission and I thought I had mentioned that . But this being a 93 it has a 4l60E trans so it doesn't use one to shift the gears that's all Computer controlled an using the TPS to get readings from to tell the computer how far open the throttle or closed .
Kept throwing codes for bad shift solenoids and I was about to commit replacing those however that was never the issue after all it was only just a computer of course the truck had other issues besides transmission and it fixed it all after replacing the Bad ECM
Not a kickdown cable the TV cable that goes into the transmission
Thanks!
En español no lo pueden hacer este documental
? What
QUESTION< I have a 1993 sonoma with the 4.3 tbi engine, can i install a vortec 4.3 directly in in? with out extra stuff, its just i cant find a tbi
Not sure what you are meaning ?
@@KnuckleHeadGarage27 will the vortex fit in my truck straight bolt in. Or do I need the ecu or other parts to make the vortex work.
Yes if your doin what I think which is going from the tbi 2 injector 4.3 to a spider 4.3 Vortec you would need the wiring harness ecm and everything
@@KnuckleHeadGarage27 ok thanks. Appreciate your help
@@KnuckleHeadGarage27 I just can’t find a tbi all I see out there are vortec. The tbi are all super high mileages.
How much is the ecw
I beleve it was around $52.00 or so
I have a 95 astro van vin#W. No codes but the thing runs like hell. In drive it wants to die (idles like a dragster)and if the air is on. Low power on low end then all of a sudden it takes off like a new engine. It aldo has a hard shift into second. It throws your head back. Ive replaced most sensors and now im pulling my hair out without answers. The only difference between your truck symptoms and mine are the codes. Im not getting codes but ot sure seems like i should be. Thanks for the video. This is a real help for people with limited resources. Great job buddy.
Hmm interesting. Does the light come on when u turn the key it should light up an if not the bulb could be burned out .
And if it does light up when you turn the key on then more than likely it could be the computer.
If it was me I would go to the junkyard find another van exactly like yours same setup it has to be exactly like yours. Like auto trans an if it's 4×4 or not an at least the same date when made like urs is a 95 so at least make sure to have a 95 computer an if it has cruise control or not . Cause all of the different things goes into play but if u can find one at junkyard an everything is the same .
I try it an see how it acts it wouldn't hurt an if nothing changes then could be just another bad ECM or something else
@@KnuckleHeadGarage27 yes when the key is on the service engine soon light comes on constant. When started it turns off. I have replaced many sensors including TPS, IAC, EGR, O2 SENSOR, FUEL PRESSURE REGULATOR,FUEL FILTER, PCV VALVE AND GROMIT, AIR FILTER, FUEL RELAYS, CARBON CLEANED PLENUM, INTAKE PLENUM GASKET MAP(twice, the first MAP from auto zone had a vacuum leak brand new🤦) and now im thinking of testing the new IAC VAVLE, because auto zone has broken new parts too often🤷. After that im thinking new computer. After that im gonna put a grenade in it and watch it burn lol.
Has the timing been checked ?
@@nicholashubbard2239 did you calibrate the iac when replaced? Sounds like a vacuum leak fs. What engine/intake does it have?
Who did you source your new computer from ?
I bought it from O'Reilly's if I'm not mistaken . But either way autozone had it too but I believe it was O'Reilly's
@@KnuckleHeadGarage27 thanks so much. I appreciate you.
Thanks
Your welcome glad I could help!
I’ve been having this problem where it’ll idle up and down I’ve changed iac map tps punched out the cat, it ran perfectly fine yesterday today it’s up down and up and down sounds like it’s idling poorly
Sounds like you have a vacuum leak or something somewhere also one thing to remember new part isn't always the fix. An sometimes new parts are bad when they're brand-new out of the box .
It’s ran great for a week , started this morning it didn’t have the problem start it up again to go to lunch it’s idling up and down and acting like a dead pedal when you move from a stop
What do you think it’s had plugs and wires an cap done, I’ve chased vacuum lines and fixed a lot of hole
Hmm dead pedal like what ?
No power to move , an how does it act if you really get on it will the truck take off hard an go
So this is what it does, takes about 3 reps of the motor spinning then it’ll fire over, then it’ll decline idle , then stop hood idle for about 3 seconds then it’ll dip down and up with idle like a surge. Then you put it in gear it still will do the surge you press on the gas a little and it’ll act like it’s gonna die then wake up and fry the tires off cause you gave it more pedal afraid it was gonna stall, if you give it the whole pedal it’ll pull of it. Seems like it lost power and you can feel just sitting in gear it’s not running right