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Posted by Outfielder on September 29, 1998 at 10:31:47:

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

I am also considering upgrading to an ///M what kind of bath can I expect to take on my 1.9? Do you have a breakdown of the costs to complete this deal from your experience?

Thanks for any help. Please e-mail it to me if you don't want to post it.

: 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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