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I might had this done last week. (archive)

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Posted by FredR on September 29, 1998 at 13:49:11:

In Reply to: Rough running 1.9 - (Possible Fix) posted by Robert on September 29, 1998 at 09:40:29:

Last week my 96 1.9 was in for its 30,000 mile service. They performed a recall, the number of which is on invoice at home. It replaced two o2 sensors and a DME reprogram. The idle is a little more smooth. Performance unchanged, and mileage up 1.2 mpg after two tanks, 31.2 mpg commuting in Houston. Take that you M owners! Just funnin! Overall its been a plus.

: BMW has put out another service bulletin in an attempt to smooth out some of the rough running 1.9 engines. The fix involves retarding the timing 6 degrees which requires a special tool (part number is on the bulletin)

: I've heard that BMW has used this "fix" on other models in the past with only moderate success. The bulletin claims that the "fix" does not affect performance but I would like to hear Mr. Sliderule's explaination on the effects of timing and performance (since I have very little understanding on what these terms mean).

: BMW has already issued a programming update that was labeled with the claim "fixes rough running 1.9 engines", but at least one owner thought if anything his Z3 got worse after the upgrade.




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