iananderson02
01-05-2008, 12:39 AM
Hello all,
Have read similar threads but haven't found my answer. Car is a 97 sport, M44. Problem is:
POOR cold starts, very low rough idle. I am able to rev the car and keep the engine going but sometimes it will die anyway. After about 30 seconds the idle is perfect and the car runs great. When the idle is low and rough the CEL will come on (and stay on), pulled the codes: All related to misfiring (random unknown cyl and cyl #4). I cleared the codes and can drive all day long with no issues and no CEL. As soon as the car sits long enough to get cold again the same problem will resurface. Same CEL codes and all.
I have cleaned the ICV, it was dirty, almost completely seized. This smoothed out the idle at all temps (somewhat) but did not fix the problem. The Crankcase vent valve is new and so is the hose from the valve cover to the CVV. The airboot has a few surface cracks, the cracks do not go trough to the inside (I inspected the inside and sprayed carb cleaner on the cracks, has no affect on the idle). I sealed the surface cracks with silicone anyway, just for a temporary aid. I also see a few cracks on the vacuum lines that go to the fuel injectors, also minor but I will be replacing these and the air boot as soon as the stealer gets them in stock for me. I don't feel confident this will fix the problem. Plugs are new, not platinum's, gas tank is 1/2 full (i will drain this down and refill in hopes that this may be caused by bad gas).
I know i've pretty much covered my basic's, What else should i check. Any wild ideas. I'm hoping t get this on the front end before I get stranded. Thanks in advance....
-ian
Have read similar threads but haven't found my answer. Car is a 97 sport, M44. Problem is:
POOR cold starts, very low rough idle. I am able to rev the car and keep the engine going but sometimes it will die anyway. After about 30 seconds the idle is perfect and the car runs great. When the idle is low and rough the CEL will come on (and stay on), pulled the codes: All related to misfiring (random unknown cyl and cyl #4). I cleared the codes and can drive all day long with no issues and no CEL. As soon as the car sits long enough to get cold again the same problem will resurface. Same CEL codes and all.
I have cleaned the ICV, it was dirty, almost completely seized. This smoothed out the idle at all temps (somewhat) but did not fix the problem. The Crankcase vent valve is new and so is the hose from the valve cover to the CVV. The airboot has a few surface cracks, the cracks do not go trough to the inside (I inspected the inside and sprayed carb cleaner on the cracks, has no affect on the idle). I sealed the surface cracks with silicone anyway, just for a temporary aid. I also see a few cracks on the vacuum lines that go to the fuel injectors, also minor but I will be replacing these and the air boot as soon as the stealer gets them in stock for me. I don't feel confident this will fix the problem. Plugs are new, not platinum's, gas tank is 1/2 full (i will drain this down and refill in hopes that this may be caused by bad gas).
I know i've pretty much covered my basic's, What else should i check. Any wild ideas. I'm hoping t get this on the front end before I get stranded. Thanks in advance....
-ian