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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Before I go tearing my new lpfp out, any other options? Car dying constantly.



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      05-01-2013, 06:43 PM   #1
Tronner
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Before I go tearing my new lpfp out, any other options? Car dying constantly.

I had a Walbro installed about 3 weeks ago at a reputable local shop. Ran about 1 tank of 91, then 1 1/2 tanks of e85 through it. A week ago I came home from a trip and the car had been sitting outside for 5 days and it was very cold. With the e85 not liking cold weather it took about 10 minutes and several cranks for it to start, but it finally did. However once it did start it stumbled and sputtered for a minute or two. Two days ago after running the e85 low I switched back over to the 91 octane map (done by Jake at PTF) and it stumbled and quit the first time I started it up. I chalked that up to the little bit of e85 still in there causing something funny.

Today, I was stuck in traffic for an accident and the car was idling for about 10 minutes until it died. Now it will start up, idle for about 15 seconds (I watch lpfp on the COBB go from 18psi or so drops to 9-10) and it dies. Sometimes it throws a cylinder injection shutdown code. Mostly just low fuel pump plausibility and low pressure.

Is there anything it could possibly be other than the lpfp? I'm probably going to have to have it towed back home or to the shop. It won't run long enough to get on the highway right now.

Thanks!
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      05-01-2013, 08:34 PM   #2
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One of our members here had a similar problem of the car just dying, I believe it turned out to be a kinked line from the LPFP or something about the return line disconnected. Eitherway it was a simple fix.

Last edited by Jeff@TopGearSolutions; 05-02-2013 at 10:18 AM.
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      05-01-2013, 09:25 PM   #3
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It should be holding a steady 72psi at idle so you def have an issue open it up
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      05-01-2013, 09:38 PM   #4
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Sounds like a kink in the line
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      05-01-2013, 09:41 PM   #5
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Or....

Fuel Pressure sensor... 100 dollar part.
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      05-01-2013, 11:02 PM   #6
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Quote:
Originally Posted by Jeff@TopGearSolutions View Post
One of our members here had a similar problem of the are just dying, I believe it turned out to be a kinked line from the LPFP or something about the return line disconnected. Eitherway it was a simple fix.
I am one of those 4, it is either a kinked supply line or loose venturi line.I now use the smaller regulator line from my old regulator for the venturi. I ran 60% E85 in -15 degree weather all winter long...no issues.

http://www.e90post.com/forums/showthread.php?t=821304

http://www.e90post.com/forums/showthread.php?t=826645
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      05-02-2013, 05:58 AM   #7
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Does it happen on low fuel tank or always. You should monitor lpfp pressure
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      05-02-2013, 08:09 AM   #8
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What are the exact codes you are getting? These: 2AAF 29F2 AND 29F3?

If so it's what BASELINE said.
Low pressure sensor: 13537614317
http://www.realoem.com/bmw/showphoto.do?id=13537614317
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      05-02-2013, 08:49 AM   #9
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Could be the sensor to . Easy to check with inpa.
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      05-02-2013, 09:13 AM   #10
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Quote:
Originally Posted by BoostedE90 View Post
What are the exact codes you are getting? These: 2AAF 29F2 AND 29F3?

If so it's what BASELINE said.
Low pressure sensor: 13537614317
http://www.realoem.com/bmw/showphoto.do?id=13537614317
2aaf - Fuel pump plausibility
2a2d - Fuel low pressure system
29dc - cylinder injection shutdown
29f2 - high pressure fuel system, fuel pressure
29e1 and e0 - mixture control

I was able to limp the car back to the shop. It was about 50 miles from where this started happening up in the mountains. At one point it died and I literally coasted downhill 4 MILES to Georgetown!! I've passed this info on to the shop and I'm sure they can fix it easily. I have to assume the pump isn't dead if it would work for a while sometimes, and fuel pressure was pretty constantly 9-10psi sometimes a bit higher. I assume that would also explain why it died after idling for so long. Hopefully it's just the line. Thanks for the responses!
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      05-02-2013, 10:01 AM   #11
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I would definitely have your shop replace the low pressure sensor. When mine went out my car behaved just like yours. I was driving from Tampa to Orlando and as soon as I got off the highway and stopped at a light the car stalled. Started it back up and stalled again after a few seconds of idling. To get the car to my friend's house I had to keep the RPMs above 1k/1.5k so it wouldn't stall. When it got dropped off at the dealership the tech told me that it wouldn't even start and they had to push it into the bay.

GL and keep us posted.
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      05-02-2013, 10:20 AM   #12
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Quote:
Originally Posted by BASELINE View Post
Or....

Fuel Pressure sensor... 100 dollar part.
This might be worth replacing anyway just for piece of mind if the car has some good mileage on it. (50,000 +).

Quote:
Originally Posted by robc1976 View Post
I am one of those 4, it is either a kinked supply line or loose venturi line.I now use the smaller regulator line from my old regulator for the venturi. I ran 60% E85 in -15 degree weather all winter long...no issues.

http://www.e90post.com/forums/showthread.php?t=821304

http://www.e90post.com/forums/showthread.php?t=826645
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      05-02-2013, 01:46 PM   #13
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I would not trust a shop to do a Walbro in tank DIY. If you are going to use a shop the $100 inline DIY is probably a better bet as it's harder to mess up. It should work fine for cars up to 500rw.

Mike
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      05-02-2013, 02:43 PM   #14
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Quote:
Originally Posted by Mike@N54Tuning.com View Post
I would not trust a shop to do a Walbro in tank DIY. If you are going to use a shop the $100 inline DIY is probably a better bet as it's harder to mess up. It should work fine for cars up to 500rw.

Mike
I would go that route if I were to do it again, but this is a reputable shop in the area (and on this board), they've done them before, and they already did this one once so I'd rather not have them completely remove it and start over. I think they just need to fix this issue. I can order another low pressure sensor as well. How easy it that to replace if I do it myself?
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      05-02-2013, 03:33 PM   #15
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or ripped line... I had the issue before. same exact codes. and a lot of backfireing.
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      05-02-2013, 07:31 PM   #16
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It was a torn hose. Going to pick it up now. Then some e50 tuning with Jake at PTF tomorrow!
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