Question about BMW X3 Series
Hi got a bmw e46 318ci 2000 it cut out on the motorway and only fires on two cylinders 1/4 i have changed the crankshaft and camshaft sensor and ecu coil pack leads wireing loom and plugs all have been changed maf sensor is fine fuel pump working compression is perfect timings been checked turns over on 1/4 runs poorly gases just getting a backfire into the engine faults only read misfire on 2/3 any ideas.
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Posted on Jan 02, 2017
It could be carbon deposits on valve seats keeping valves from totally closing. You can try getting you a can of motorcraft PM3 top end engine cleaner and get engine up to operating temp then remove one of the small vacuum lines from the intake and draw the contents of the can slowly into the engine.After you have drawn in the contents shut engine off and let it soak for about 45 minutes then crank it back up and let it run until it clears. Now it will smoke like a forrest fire while you are doing this so don't be alarmed,just tell the neighbors you are spraying for mosqitos.This may cure the problem. If not you may be looking at a valve job.
This can be verified with a compression test if this is what is causing it.
Posted on Feb 05, 2009
SOURCE: BMW 318 si 2002 engine cuts out
solution 1 -fuel related
change fuel filter & add techron gas additive to tank.
solution 2 - exhaust back pressure too high (cat. convertor stopped up.
Posted on Feb 27, 2009
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