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09-22-2009 01:51 PM #1
26 and 27 multiple fuel trim 1 and 2 limit reached
Hello all, I have a 2001 with 45k miles, yes I know, I do drive it, and I love the car.
I have had intermittent CEL coming on for about a year or so, each time I reset the code by unplugging the battery and it takes about 5 months to come back on.
The engine does NOT idle rough, it runs perfectly. I went to a shop today because even after battery reset the light was coming on after a few hours of driving so I figured the problem was getting a lot more severe.
He used a snap-on reader and saw 27 multiple fuel trim 2 limit reached and 26 multiple fuel trim 1 limit reached. All other readings were perfect from his reader.
He said I should get a tune up and it may cure it, spark plugs, perhaps coils, etc..
I don't want to blindly change things, especially the MAF which I believe would cause the car to idle very rough if it was bad, and the car idles perfectly and drives beautifully. He reset the code but it came back after 2 minutes of driving.
I have read so many postings and people have many opinions of what to change, ranging from plugs to gaskets to MAF and MAF sensors.
Any thoughts other than a massive overhaul and blind changing of things from this small independent shop here in Massachusetts?
Very much appreciated!
09-23-2009 09:17 AM #2
09-23-2009 09:31 PM #3
- Ft. Worth, TX, United StatesMember No: 13623
- Join Date
- Sep 2001
- Rep Power
Unless you want to throw parts at it you need to
get it diagnosed properly. This could be items that include spark plugs, air filter, fuel filter etc but more than likely you have a vacumme leak. This is best found with a smoke test....smoke is forced into the motor via the intake boot at low pressure which comes out where there are vacumme leaks. Additionally you could have a bad MAS but that is a lot of money on a guess. If you don't have a shop and need one, try www.bimrs.org for a reputable BMW specializing indy. Trent Cole, Tech Advisor, Lone Star Chapter, BMW CCA
President, Lone Star Bavarian, Inc.
FT. Worth Tx, 76132
09-23-2009 11:22 PM #4
- PFLUGERVILLE, TX, United StatesMember No: 78269
- Join Date
- Jun 2003
- Rep Power
Re: 26 and 27 multiple fuel trim 1 and 2 limit reached
09-24-2009 12:25 AM #5
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