Random Misfire no codes
#1
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My 2000 X308 (NA) is occasionally misfiring while at idle only when in drive with the AC on. It is not showing any codes(yet), restricted performance or check engine light. I have inspected and do not hear or see an obvious break to the vacuum lines but have not smoke tested. Should I just drive until it throws some codes? I will also note that the car sometimes experiences longer than normal crank times when cold perhaps they are related. I would love some ideas.
#2
#3
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Misfiring under load at low rpm points to a spark plug or coil issue. John's suggestion
of watching the live data is good as it may allow you to identify the cylinder/s that
is/are not behaving as they should. It's not always coils or spark plugs but that would
seem to be the best starting point.
of watching the live data is good as it may allow you to identify the cylinder/s that
is/are not behaving as they should. It's not always coils or spark plugs but that would
seem to be the best starting point.
#4
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Thanks for the replies in the past when I had a coil go bad it was a much worse misfire and it showed the cylinder code. All the plugs have been replaced although about 25,000 miles ago now maybe it is time... The coils have only been replaced as they have gone bad. John I do have P1000 but no other codes showing. Unfortunately, I just have a cheap scanner so will need to borrow a friends. I will let you know what I find out.
#5
![Default](/forum/images/icons/icon1.gif)
My 2000 X308 (NA) is occasionally misfiring while at idle only when in drive with the AC on. It is not showing any codes(yet), restricted performance or check engine light. I have inspected and do not hear or see an obvious break to the vacuum lines but have not smoke tested. Should I just drive until it throws some codes? I will also note that the car sometimes experiences longer than normal crank times when cold perhaps they are related. I would love some ideas.
#6
#7
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Interesting, I have almost the identical issue on my 01. Runs ruff at Idle for about a minute then returns to normal but only does this after sitting for a few days. I’ll check a few of the items mentioned but honestly I’ve been putting up with it. Took her on a 1800 mile trip last summer and no issues other than me complaining about high fuel prices.
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