Rough idle until engine is up to temp - Ambient air temp doesn't matter Hello Group, I just completed swapping a new (used) M44 engine into my '98 318i. Seems this is the best place to go for M44 questions. The car has a "lumpy" idle and "stumbles" coming off idle when the engine is cold. As soon as the engine is up to full temperature, the idle is perfect and it accelerates/revs perfectly. Before the car gets to full temp, it bogs/hesitates/stumbles when accelerating or reving while standing still. This issue is present regardless of ambient air temp. For example it was there today with 70* ambient air temps. I have not yet tried to pull any fault codes, but there is no Check Engine light on. It appeared all the other rough idle topics pertained specifically to when the air temps were much colder. Has anyone run into this issue before? Thanks, Chris |
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As soon as the car gets to full operating temp, it is 100% perfect. I have not yet pulled codes or hooked it up up to the GT1 to find out if there are other stored codes. |
First thing I would do is check the plugs. |
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my car was running pretty rough a little while ago and i thought for sure i was misfiring and had a vacuum hose leak, changed the plugs and everything was fine |
Being new to this motor, do you prefer the Bosch FR7LDC plugs or the FGR7DQP? FR7LDC = 2 prong FGR7DQP = 4 prong Thank you for the feedback, -Chris |
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Thank you, Chris |
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As for plugs, I run the 2-prong NGK's, OE for the M42, not sure about the M44. |
Bosch FR7LDC or NGK BKR6EK. I've used both; they're both good plugs and both work fine. Go with whatever is cheaper and/or available in your area. Anything more (4-prong, platinum, iridium, etc.) is unnecessary and probably a waste of money if your change your plugs regularly. Quote:
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