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Re: Idle problem (miss or small backfire) with 95 (archive)

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Posted by Melby on March 09, 1999 at 17:33:11:

In Reply to: Re: Idle problem (miss or small backfire) with 95 posted by Tom on March 09, 1999 at 17:16:12:

: : I recently had a service done on my 95 M3 at the local dealer. Along with the service, the valve cover gasket was replaced. After I got the car back, there was miss, or small backfire that started to occur at Idle. The car would drive fine, but at Idle it would miss. So I took the car back to the dealer and after numerous test, they concluded it was a problem with the air fuel sensor, and it was replaced. So I get the car back again, but it still has the same problem. I think they may have just increased the idle to compensate for the miss. Has anyone else experienced this problem, and if so, what was the cause? Thanks for any valuable information.

: i would think if it was a miss it would just be the way the engine is retarded. How high does the rpm's run when it missess do the rpms go up or down? write back but it might be a fuel sesnsor and maybe just the engine has a bad calculation when the processess r happening

There doesn't seem to be a move either way in the rpm's, or if it is, it is very slight. To describe it more, it is most noticeable out the exhaust, and you can even feel it when sitting in the car. Before the dealer replaced the air fuel sensor, it was considerably worst, but the problem has not been fixed totally. One way to decrease the problem was to apply some sort of load to the motor with the AC or just bring the rpm's up to 1000+. Hopefully this helps shed some more light. Thanks for the input.

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