Quote:
Originally Posted by JCO2185
I too was having the same cold start issues and was throwing a P0300 and P0301 code (engine misfire, and cylinder 1 misfire)
Checked the plug on cylinder 1 and it was good. Thought maybe it was an injector so we swapped out a new injector this morning. Tomorrow morning will be the real test when I start it up
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So you been having this issue too?
from looking at other peoples solved problems where cold start was the only issue, it look like injector was the main culprit after doing some extensive online research today. Look like it has something to do with leaky injectors. The only misfire code I got from CEL illumination was for cy2 and cy5. However, I don't know if is because of the warmer weather or it's because of techron fuel system cleaner but I have not been getting any CEL so far, when I check for fault codes right after the choke mode I usually have a pending code which is usually cy2 but I guess the problem is not bad enough to come through as a CEL and usually just go away. I also wonder if we normally get pending misfire code on choke mode and we just don't know about it... I know there is some peoples on this forum that have checked their misfire history and seen that they been getting misfires and didn't even know about it. Please post up your result tomorrow as I will post my result for plug check and compression check.
catman, thanks for the info
on choke mode when it's cold outside the car does usually vibrate alot and most peoples would say it's very rough, so maybe that's why there is a TSB for cold start misfire? do you happen to have any more info on that BTW? anybody? I know mach is supposed to be looking up on that TSB for me since he had his ecm reflashed by the dealer just for this same cold start misfire reason.
kmorph, I don't think the isolator play a part in this since it's not a moving object and I don't see any sensor on or under. I think the injectors are under the rubbers in between the cylinder head's inlet.