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Old 05-23-2020, 01:26 PM   #1
Demkine
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Help Engine idling problems

My 2002 325ci convertible at first drives great then I ran in to a problem where I ran the car on low fuel then the car stop on the highway with me. Placed fuel in she started up and made it home . Got a misfire code on cyclinder 3 replace all coils and spark plugs Also got temperature sensor code and replaced the 2 sensors front and back also replace the thermostat housing and the upper radiator hose and expansion tank and valve cover gasket . Car started idle fine then the car started overheated Slowly,I don't think I bleed it right but the main problem is the car is starting up and shutting off so I Change the fuel filter and fuel pump, I also cleaned the map senor.Started up and idle fine THEN now the rpm is going up and down and now multiple misfires coming on diiffent cyclinders on my scanner I'm going crazy. Does It sound like and vacuum leaks or injectors? Any help will be much appreciate
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Old 05-23-2020, 06:00 PM   #2
NZ00Z3
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Time to check your fuel trims with the scanner. With a hot engine at idle, look at the short term and long term fuel trims. If any are >8% then you likely have a vacuum leak. Rev the engine to 3,000 rpm for 30 seconds. If the short term fuel trims reduce then its confirmed that you have a vacuum leak.
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Old 05-24-2020, 06:43 AM   #3
markusmarkus
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The first step in diagnosing a problem is to scan the engine computer (DME in BMWspeak) for codes.
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Old 05-25-2020, 07:59 AM   #4
Demkine
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Thanks for the reply I'll check and let
You guys know
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Old 05-25-2020, 08:30 AM   #5
BaliDawg
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Check out these links.
OBD Fusion: https://forum.e46fanatics.com/showthread.php?t=1240733
Cold weather misfires and CEL: https://forum.e46fanatics.com/showthread.php?t=897616
How to smoke test: https://forum.e46fanatics.com/showthread.php?t=1261077
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