Boat Won't Start Again After Running and/or Two Beeps Every Minute - How to Change the IAC Valve
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- Опубліковано 6 сер 2024
- In this video, I share my recent experience with my boat, a Tahoe 234 with the Mercruiser 350 MAG MPI Engine. The boat would start great at the beginning of the day when cold, but after running for a while, it would not start without disengaging the transmission and starting the boat in wide-open-throttle position. One of our last trips out prior to performing this fix, we experienced two beeps every minute until we returned safely to the marina. Some research on the internet led me to believe that the culprit was a faulty Idle Air Control (IAC) Valve. This simple fix was quick, easy, and fixed our problem!
Other similar engines that this fix should work on, as well, are the 5.0L and MX 6.2L MPI sterndrive engines.
Since the 350 MAG MPI Engine has been produced over a number of years, there are some variations in the engine model numbers, with respect to the necessary parts. The video attempts to detail those differences and provides the necessary OEM part numbers.
The engine on this Tahoe 234 has a model number that falls into the range of 0W650000 thru 1A299999. Parts needed for these models are as follows:
35-8M2001030 - IAC Muffler
862998 - IAC Valve
Similar engines that were produced previous to mine, falling into the range of 0M300000 thru 0W6499999, would need the following parts:
35-863829 - IAC Muffler
862998 - IAC Valve
27-8M0119616 - IAC Gasket
I am not a licensed mechanic and do not pretend to be. I'm just a fellow boat-owner trying to share my experience and hopefully save you a little cash. Anything that you do to your boat is your responsibility and, as always, if you're not comfortable doing this, consult with a real mechanic.
Please feel free to share your thoughts and ideas in the comments! - Навчання та стиль
I watch a LOT of Mercruiser repair/service videos. This is one of the best I've ever seen! Thanks!
Wow! That’s so nice of you to say. Thank you!
You my friend ae a life saver. We went to pull out our boat yesterday, it started we gave it some juice then it stopped. We could not restart to save our lives. Happen to be researching videos came across yours about bypassing IAC. I did it and viola it started. Thank you....
Great job! Glad to help!
Thanks for such a good explanation and part numbers!
Thanks, I hope the fix works for you! Please let us know if it works for you.
@@budgetprojectsbydavid5263 yes it worked for me, I think the muffler came out because I found it on top of the throttle plate. I didn’t want to take any chances on troubleshooting the iac valve so I put a new one in along with a new muffler. Smooth and quiet now. Thanks!
That’s great! I’m curious to know if you used OEM parts or if you got the Ford Windstar IAC valve from your local parts store?
@@budgetprojectsbydavid5263 I used the oem “quicksilver” parts, my local boat store luckily had them in stock.
Great info! Thanks..
Great video,that happens to me yesterday at the lake😅
It usually happens to me when we have guests out! I need a good audience to witness the calamity! Thanks for taking the time to comment.
thank you for that Video
Hi from New Zealand.
Thanks for your video. I had the dreaded 2 beeps not long after we purchased or 2010 mercruiser 5.7 Horizon. I found the drive oil to be low and toped it up. Problem solved. I'll be checking my IAC valve and muffler before summer. Cheers
Seems like my drive oil was different. It has been a few years since I got that one, but i thought it was like a longer and more frequent (angry!) beep. Thanks for stopping by! Enjoy your summer!
@@budgetprojectsbydavid5263 sorry, yes you are correct! It was a longgg high pitched beep!! . Where I live 99.9 % of boats have Outboards. Thanks for a sharing your knowledge
Thanks. Excellent video.
I have the same issues described in this video and plan on replacing the IAC this week.
Will this clear the double beep warning sound once I’ve completed the repair?
It did for us. Once you replace it, please come back by and let us know your experience. Thanks!
Hello David! Great video! I have a 2011 6.2 L. engine in my boat that is having idle problems (low idle) and have been looking for a video that shows how to replace the IAC. All the previous videos show the procedure on the older models that use the 35-863829 muffler. Yours is the first video that showed the replacement on a newer model. When you took off the IAC on your boat the gasket remained in place without tearing and you just installed the new IAC without replacing the gasket. My mechanic told me to buy a new IAC and the adaptor that the muffler sits in because the gasket is not sold separately. I am hoping that my old IAC comes off without tearing the gasket. Could you tell me the year of your boat and how many hours you have on your engine. I am hoping that I can install a new IAC only. The new adaptor looks to be an additional $100.00. Again, thank you for the help!!
Hi Robert, thanks for reaching out! Glad to help! I hope your gasket comes off easy. I don’t remember mine being an issue. The boat is a 2007 that we purchased in 2015. No hour meter, though, and i have never connected it to the device that tells you the hours.
I’m hoping this is the fix I need for mine. Starts up cold just fine but once it’s warmed up I have to put it in neutral and pump the throttle to get it started back up.
I hope so too. I had an impeller go out on me this weekend. So glad i had barely made it out of the marina when the long single beep of death shut me down. My temp usually runs at 140 and it was at 200. So, don’t be a dummy like me and make sure to change your impeller often!
Hi there - did this fix the problem for you? I seem to be having the same problem with my 3.0L Thanks in advance.
It completely fixed the problem for me.
Great video! I have the same motor with a Bravo 3 and I'm having an issue where it drops RPM and then catches when going into forward or reverse. The dealer is telling me it's normal and the computer is controlling it like a shift interrupt switch would on an alpha. Do you happen to have any video of yours going into forward and reverse to see if it's normal?
Eeeeee, i’m trying to think. I don’t believe i do, but that doesn’t sound like something mine does.
Here is a link to a video of what mine is doing when going into gear. The dealer swears this is normal but I've never had one do this, but mostly have been a Volvo guy. Also not sure why it came from a different account on my PC, so sorry about that! Also thanks for your time!
ua-cam.com/users/shortsf-0JnqBha18?feature=shared
The belly of the beast is where all of the world’s 10mm sockets eventually go.
Isn’t that the dang truth?!
Hello thanks for this video. Would this change the rpms of the engine. My engine looks the same as yours 5.0 mpi. And is running at really low rpms at idle. Around 500. Can't see where to adjust idle. But I'm going to check these filters thanks
I think it should smooth out a rough idle. If it’s electronically fuel injected, I don’t think you have any control over the idle rpm. The computer manages that for you based on sensors such as the IAC valve/sensor.
@@budgetprojectsbydavid5263 yea I found that out too. Ordered new IAC to install
Good deal! Let us know if it works!
@@budgetprojectsbydavid5263 to start, I put 2 new foam “muffler” in both engines. These are the little foam air filters that sit in the back of the flame arrestor/air filter. The old ones were really bad. Put new ones in rpms went from 450-500 to right on 600. So I think this worked. I did not change the ICV but I have it if needed
Very nice! Did you clean the flame arrester at the same time or was it ok?
oh hell ya
I have problem in my mercury mercruiser 350 mag, alarm ( overspeed) whats the problem ?
Do some google searches and research. It could be many things. I might consider enlisting the services of a mechanic.
Would this cause reduced power? I have the hard start issue. My beeps seem to be about 2 minutes apart. Is the length between beeps a different fault? After warming up my boat actually starts fine. My vessel view is showing no fault?
I think it could cause the system to intentionally reduce power to 80% or something like that. Two beeps per minute is a soft engine error and is the exact error i was getting when the rectangular iac muffler (foam filter) on the base of the iac valve’s mount was clogged. I changed that filter and my problems went away immediately. It’s just a small rectangular piece of foam, but it set me back $20 on Amazon. I’ll see if i can find the link.
www.ebay.com/itm/185351930550?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=lvVhobzhTp-&sssrc=2349624&ssuid=yGjsdGtBQlS&var=&widget_ver=artemis&media=COPY
Check the oil pressure switch. I had that issue and replaced the iac valve which improved but every now and then I had a hard start issue and turned to be the oil pressure switch that giving wrong readings to the ecu which was turning off the fuel pump.
Good to know! Thanks for the advice! Fortunately, we haven’t had the issue come back, but will keep that in mind if/when we do!
@@budgetprojectsbydavid5263 if you still have original oil pressure sender, replace it it is a kind of party buster and costs peanuts. You can replace it by yourself
Are you telling me a bad IAC will cause a no crank condition if its in a Marine application? I used to be an automotive tech and never had a IAC cause a no crank condition or did I misunderstand you?
That is exactly what I’m telling you. You could crank the engine, but only by pushing the button to disengage transmission. The double beep could happen at any time and once I changed the IAC, the problem went away.
@@budgetprojectsbydavid5263 I wish these engineers had this shoved up their a##. Good God who thinks up this shit anyway. Dude out in BFE boat take a shit wont crank because of a bad IAC and he is stranded. I would never know about this I would be stranded . That is up there with the newer Dodge trucks if the voltage drops bellow 12 volts the engine wont crank / I saw that on a recovery video they went out and it would not crank he put a jump pack on it got the voltage up and it cranked over and started and he was out in the boonies miles from civilization Give me a 650 CFM Holley and points and condenser they can take all this new sh %% and shove it @ Go Old school all the way !
Preach, brother! I have a ‘53 Willys M38A1 that was built with simple systems and redundancies like double serpentine belts. I like the points, condenser, and 1 barrel Carter carburetor. The fuel pump is mechanical, but it seems to work just fine even though it’s 70 years old. If it’s not running, you can usually figure out why rather quickly.
Contrast that with my daily driver 2007 LX470. One knock sensor starts acting up and the car goes into limp mode. To test and replace the sensor, you have to remove the intake manifold. Not something you would want to deal with on the trail or out in BFE. Crazy!
@@budgetprojectsbydavid5263 Love the old willys # Did you see the dude with the new F 150 got a crack in one of the tail lens got moisture in there took out all the modules in the tail lights set a bunch of codes truck went to shit real quick . When he got done it was $5800 for tail lights but did not include the modules show him with a scanner going through the process of finding the codes and diagnostics. And I used to be as Ford Tech . This is way above my head There is no pulling the lens off and putting in a 1157 Ford stepped up their game they werent happy with a 4 foot dry one they went with a 10 footer no kiss no for play just shove it in and enjoy the ride # I will stick with my Uncles 85 GMC 2500 series he bought it new I can pop the hood and got gobs of room to work on the engine . Take these new cars and trucks and shove it hahahahahahaha
I DID see that! Absolutely mind-blowing! I’m not a mechanic by trade (accountant), and I don’t know anything about the new electric vehicle technology, but i wonder if the technology behind them is much simpler than what the big three have come to with gasoline powered automobiles.
My boat have to put it in gear so we can start. Then I can rave it but it won't stay started when I put it in neutral just Dies and won't state idol unless it's in gear
Sounds familiar. Fuel injected or carburetor?
@budgetprojectsbydavid5263 It was the idle control valve This video saved me $1200 just for a $40 part 3 boat mechanic guys told me. I had bad fuel and couldn't figure it out either Set for a year, ran down to autozone and grabbed the part. Bad boy started working awesome
Awesome! Did the Ford Windstar (i think that’s the model) iac valve work for you? I’d love to get confirmation on that!
@budgetprojectsbydavid5263 Yes sir fired, right up Thank you a lot brother I had 3 mechanics that I couldn't figure it out Thank God i run into your video 🤘🏼🤘🏼
I’m so glad it worked for you! I bet i know what you’re doing this weekend! 🚤🚤
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