Re: After insp. II mpg down 7 check engine at idle (archive)

Sorry to sound pessimistic, but the guy sounds like a little bit of a cowboy, in intentions if not always actions - I'd think he'd be sesnitive to the expectations of the owners of these kinds of cars - most of us seem to be enamoured of these "high calibre" cars, and if he intends to keep his customers, he'd be wise to keep those expectaions up by taking on that attitude too...

Best guess would be to pull the codes first and see what the DME thinks is wrong; the speed-up could be a self-diagnostic thing, and the reduction in MPG would suggest to me the DME is in fail-safe mode with MAF-determined mixture - without the O2 sensors (if you can safely assume he's only affected what he's said he's touched!)

I'd get the codes ASAP... if your MPG is down, then if the car runs rich too long you're going to be damaging the cat convertors (unburnt fuel going into them & burning there will damage/slag them).

Good luck.

Max F

Sorry long post. I took my beloved 1994 740il to a self proclaimed BMW guru for an inspection II service in June. Also had him change the 2 O2 sensors per bentley recommendation as well as change the brake fluid and coolant. After the service I noticed my mpg went from 21-22 to 15-16. I also developed a rough idle in park and every once in a while the engine would rev to about 2200 rpm when placing the transmission into park. Now every once in a while if I let it idle for 5 to 10 minutes the check engine light will come on and stay on till I drive it for 1 to 3 minutes. Haven't read the codes yet, I will try to get them today. Any ideas? could this self proclaimed "guru" have done something wrong while doing the inspection service. Is it possible that he charged me for O2 sensors that he didn"t replace. I ask this because 2 weeks after the service my battery died. (he had to go to the bentley to figure out how to remove the non powered rear seat) The battery had no water in it. Checking the water in the battery was part of the inspection II service. Could the battery went dry in 2 weeks? the charging system checked out fine when tested. ideas?

Larry
1994 740il

Follow Ups:

Thanks Max, can I get the codes with the key on- Larry 04:56 1/21/2002 (2)
- Re: Thanks Max, can I get the codes with the key o GBaugh 13:29 1/21/2002 (1)
  - Re: Thanks Larry 16:58 1/21/2002 (0)

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