92 735il rough running on Idle - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 02-05-2009, 06:54 AM
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92 735il rough running on Idle

The car really runs rough when it is sitting and idling. but when reved up it smooths out
I have changed and cleaned almost everything. "all sensor's and plugs and wires" the car has the 3.5 straight 6 I'm lost
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#2 (permalink) Old 02-05-2009, 09:42 AM
OMFG another one!?
 
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I'd have a look at the intake boot for cracks; this was the issue for my E30.

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#3 (permalink) Old 02-05-2009, 10:27 AM
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Could be the MAF.

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#4 (permalink) Old 02-06-2009, 05:46 AM
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It does seem like there is a massive vacum leak around the intake manifold. I will know more today when I tear into it.. but I did pull codes and the O2 sensor is saying it's bad
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#5 (permalink) Old 02-06-2009, 06:23 AM
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Go with the air leak 1st, the o2 is probably picking up incorrect mixture values due to vaccum leak.

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#6 (permalink) Old 02-06-2009, 06:52 PM
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do you have a vacuum guage?? if not, get one. it's fairly self explanitary. needle in the green is good. if it is bouncy, then there is a dead cylinder. WHY the cylinder is dead could be a few things, but one that comes to mind is a intake manifold gasket. a propane tank (like for camping lanterns) and a torch fitting with a rubber hose can be used (unlit) to 'sniff' along the intake where the 'miss' is. if the idle changes, you have found a leak. a can of carb cleaner could also do the trick, but can be tough to control in tight quarters.

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