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Discussion Starter · #1 ·
I'm new to this forum but I've found such great advice here in the past that I needed to post some questions. I have a 2002 325i and about 2 weeks ago, upon start up, there was a very rough, cough, idle and sluggish acceleration. Felt like a vacuum leak or coil misfire. I looked under the hood and did find a bunch of holes and cracks in the lower intake boot, especially around the smaller diameter tube that goes into the engine. Replaced this lower boot and was hoping that would completely fix the problem. It fixed about 80% of the problem, but my check engine light remains. Codes read P0313 - misfire, P1619 - cooling system (thermostat), and P0102 - MAF, vacuum leak.
The symptoms that remain are a slightly rough idle. It is consistent and steady, very rhythmical. It doesn't sputter and die like I've read on some other posts. The acceleration is still sluggish, but not nearly as much as before, and only seems to be sluggish up to about 3000 RPM, after 3000 RPM it feels like it pulls better.
I should also mention that the car uses oil, so that I have to add at least 4-5 quarts between 3000-4000 mile oil changes
I've watched videos and read multiple posts. Where should I go next? I would like some direction rather than just pulling things out and guessing. DISA valve, CCV, ICV, thermostat, MAF????
Thank you for reading.
 

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Discussion Starter · #3 ·
Thank you very much for the help and information Fast Bob. Yes, the car has some years and some miles on it, appox 161,000. I will start this weekend with cleaning and checking the ICV and DISA valve since they are close together. The CCV, from what I've read is a pretty big job, I'll have to have a little more time for that. I'll have to watch some youtube videos and read some more forums on the O2 sensors as I haven't done that before. If no luck, I think I'll go into the coil packs and spark plugs. What exactly is involved with a cooling system rebuild?
 

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Discussion Starter · #5 ·
Other than the code that my car threw for the MAP cooling, what are the symptoms associated with a thermostat or cooling system problems? Would that cause my rough idle and sluggish acceleration? More importantly, would replacing those things fix my issues?
 
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