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Old 06-04-2019, 05:10 PM   #1
PreludeGuy
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330i starts but immediately dies. Will running if I keep revs 1500+

Please note: NO SES codes!

Hi all,

I am hoping someone might be able to help me narrow down the cause of my issue.

I have a 2004 ZHP sedan. I am restoring it so it doesn't get driven much. It has sat for a while now. The car ran fine 8+ months ago.

I don't know how old the gas is. I am pretty sure the gas came with the car when I got it. 3 years ago. I added 5 new gallons a few days ago though.

So when I start it, it starts, but immediately dies. If I start it and feather the throttle to get the RPMS over 1250-1500 it will stay running.

Here's the weird thing about my issue. The car's exhaust gets hot really fast when I feather the throttle and keep it running. I kept the car running this way for around 45 seconds and could hear the exhaust getting hot. When I shut the car off, the engine fan came on.

1.) I already tried unplugging the MAFS to see if the MAFS or an intake leak. No change

2.) I also replaced the fuel pump. I wanted to change it anyway, whether it was the issue or not. Seems to be a common fail item. Figured I would replace it now.

3.) Cleaned the DISA valve. It was working fine.

4.) Filled up the gas tank with new gas.

Based on my research, the Idle Air Control Valve could be the issue. Cam sensor ( my other E46 has had both the intake and exhaust cam sensor fail and it still ran fine. Just bad gas mileage). Could the gas be bad and the new gas I added have not reached the fuel pump? I hope nothing crawled into the exhaust.

Any other ideas?
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Last edited by PreludeGuy; 06-04-2019 at 05:12 PM.
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Old 06-04-2019, 05:19 PM   #2
KING_TAGS.E46
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Fuel filter or clogged cat and possibly a maf no matter if there is a change in Rpms when it’s unplugged I had the same problem on an e36 m3 I had it running cane back to work after the weekend wouldn’t start, cleaned the maf and it now starts right up. Try cleaning maf see if it changes, then change fuel filter and remove downpipes and check cats


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Old 06-04-2019, 05:27 PM   #3
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IT could be a bad vacuum leak. Check your short term fuel trims to see if they are >8%. Most likely cause is a hole in the small rubber hose off the rubber boot going to the idle control valve.
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Old 06-04-2019, 05:47 PM   #4
PreludeGuy
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Quote:
Originally Posted by KING_TAGS.E46 View Post
Fuel filter or clogged cat and possibly a maf no matter if there is a change in Rpms when it’s unplugged I had the same problem on an e36 m3 I had it running cane back to work after the weekend wouldn’t start, cleaned the maf and it now starts right up. Try cleaning maf see if it changes, then change fuel filter and remove downpipes and check cats


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I have another MAFS from a 330ci. I'll swap that one in. I don't think it will help, but worth a shot. I will even swap out the coil packs from that car.

I don't mind replacing the fuel filter either. I will put that on my list of parts to buy.

Quote:
Originally Posted by NZ00Z3 View Post
IT could be a bad vacuum leak. Check your short term fuel trims to see if they are >8%. Most likely cause is a hole in the small rubber hose off the rubber boot going to the idle control valve.
I'll check the hose as well.

I am almost positive a vacuum leak there would be remedied by unplugging the MAFS electrical connector. 3 months ago I replaced the crank case ventilation system on my 2001 325ci. (Yeah, I have a a few E46s. lol). I missed tightening the MAFS boot to the boot that connects to the throttle body. Huge vacuum leak. It was late at night and I wasn't at home. I unplugged the MAFS electrical connector and the car ran fine so I could get it home.
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Old 06-04-2019, 06:00 PM   #5
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you have a plastic or rubber vacuum hose popped off somewhere. time to break out the flashlight
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Old 06-04-2019, 06:05 PM   #6
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Could also be a stuck idle air control valve.

t
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Old 06-04-2019, 06:48 PM   #7
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this will sound dumb, but I would also disconnect the battery for 10 minutes and reconnect.
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Old 06-04-2019, 07:13 PM   #8
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Could also be a stuck idle air control valve.

t
This would be my guess, though no codes is odd
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Old 06-07-2019, 03:56 PM   #9
PreludeGuy
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Thanks for the help, guys! It turned out to be the IACV. Not only was it dirty, it was stuck! I had to use a butter knife to free it up. I turned that flap with the knife. I didnt think it would work. Turned it and it was still tight. Then it all of a sudden let go and was freely moving.

Just installed it and the car runs again!!

Thanks again!
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Old 06-07-2019, 04:21 PM   #10
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did you try cleaning it. you just stabbed it and put it back?
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Old 06-07-2019, 04:43 PM   #11
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Cleaned it thoroughly. The flap still would not move. I figured it was bad anyway, so I used the butter knife to rotate the flap. That fixed it.
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Old 06-07-2019, 05:21 PM   #12
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yeah you have to open the gear/flap to let the cleaner get in and dissolve. though there is school of thought that that flap is not supposed to be manually moved. but i never really followed up on it.
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