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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Sat, May-12-2018, 05:54:49 PM   #1
nholmes
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Thumbs down New Plugs + New Coilpacks = Rough Cold Idle?

Hey collective wisdom, I'm trying to find out what's up with my car and I wanted to see if the community might have some insight that can help.

I don't know if it's the plugs, the coilpacks or the ASC silicone elbow I installed all at the same time. I verified each plug was gapped to 0.32 prior to installation.

Car is a stock S52 motor, no tune with an intake, ASC silicone elbow, Dinan TB and Bimmerworld catless race exhaust.

Prior to installing new plugs and coilpacks, the car never had any issues with these mods and idling while cold. Now when I start the car it almost wants to die, the motor really shudders until I blip the throttle once or twice. It eventually recovers after a minute and then starts to equalize. I also can confirm with INPA that there is no knock. I connected my laptop to the car while starting and idling and everything looks good. No codes and the car has seen four drive cycles now since installation. I also did reset the DME adaptations following the installation of the parts.

At the advice of a friend, I opted to remove the OEM Bosch coilpacks and keep them as back-ups since I've been told they are known to fail on these cars. Because I didn't know the history of the plugs I decided to change them since I was going to be "in there anyway."

Here's what was in there prior, I have no idea is these are the right plugs or what for this car:





My engine knowledge is fairly limited since this is a hobby, but white is typically a leaner a/f mixture - right? Not that I'm worried.

After poking around, I found these NGK plugs to be a suitable OEM replacement. BKR6EGP

Does anyone have any comments on these? I don't think my car warrants a colder plug or anything or even fancy plugs. Stock photo because I don't have any pictures of them but this is what I purchased:



For the coil packs I went with the Delphi brands as it was reasonably priced, included boots and had a history of reliability.



So, I'm not sure what to do next.

I guess I could re-install the ASC throttle body and see if that makes a difference. I could also put the Bosch coilpacks back in. The old plugs are done, I tossed them not thinking there was a chance I might need them again.

Any help/tips/advice is appreciated!
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Old Sat, May-12-2018, 06:08:32 PM   #2
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Default Re: New Plugs + New Coilpacks = Rough Cold Idle?

I am leaning towards the hose from the idle control valve to the elbow...I bet there's a crack by the elbow.
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Old Sat, May-12-2018, 06:08:42 PM   #3
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Default Re: New Plugs + New Coilpacks = Rough Cold Idle?

One thing Iím going to investigate is if air is getting past the clamps holding the ASC elbow to the back of the MAF and the TB. Air getting in there might mess with the air/fuel mixture since the DME canít account for that additional airflow coming in behind the MAF.
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Old Sat, May-12-2018, 06:09:27 PM   #4
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Default Re: New Plugs + New Coilpacks = Rough Cold Idle?

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I am leaning towards the hose from the idle control valve to the elbow...I bet there's a crack by the elbow.
I will check that, thank you.
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Old Sat, May-12-2018, 07:06:48 PM   #5
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Default Re: New Plugs + New Coilpacks = Rough Cold Idle?

I would try the original coil packs.
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Old Sat, May-12-2018, 07:54:48 PM   #6
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Default Re: New Plugs + New Coilpacks = Rough Cold Idle?

check the plugs for any cracks in the porcelin,
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Old Sat, May-12-2018, 09:48:41 PM   #7
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Default Re: New Plugs + New Coilpacks = Rough Cold Idle?

Thanks for the ideas, I’ll try these
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Old Sat, May-12-2018, 09:59:51 PM   #8
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Default Re: New Plugs + New Coilpacks = Rough Cold Idle?

I would look for cracks in the IAC tube as they’re known to crack and cause this exact issue. Mine didn’t have idle issues by when I pulled the tube it was severely cracked. Maybe yours was the same and installing the elbow opened the cracks up to leak. After that I’d install old coils. Delphi is a decent company but they also have bad coils and sensors out of the box sometimes
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Old Sun, May-13-2018, 10:11:52 PM   #9
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Default Re: New Plugs + New Coilpacks = Rough Cold Idle?

Cool. I’ll have to follow-up this evening
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Old Tue, May-15-2018, 06:33:16 AM   #10
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Default Re: New Plugs + New Coilpacks = Rough Cold Idle?

Looks like it's the ACS delete elbow.



I put the ASC throttle body back in and the cold idle issues went away.

Probably air getting in behind the MAF somewhere.

Stay tuned
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Discussing New Plugs + New Coilpacks = Rough Cold Idle? in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)