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Engine Backfire


MattCern

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Hi,

First time in this forum. I purchased a 95 S4s about 3 months ago and so far so good, but I do get a small backfire or pop when I upshift through the gears. If I keep the rpm's below 3000 it usually doesn't happen, but my grandma drives faster than that. I've tried blipping the throttle between shifts and that some times works, and not letting off of the throttle and speed shifting works, but way to hard on the car. Any ideas on what is causing this problem? The car starts great, idles smooth, runs nice and cool, and has plenty of power.

Hollis

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Hi,

First time in this forum. I purchased a 95 S4s about 3 months ago and so far so good, but I do get a small backfire or pop when I upshift through the gears. If I keep the rpm's below 3000 it usually doesn't happen, but my grandma drives faster than that. I've tried blipping the throttle between shifts and that some times works, and not letting off of the throttle and speed shifting works, but way to hard on the car. Any ideas on what is causing this problem? The car starts great, idles smooth, runs nice and cool, and has plenty of power.

Hollis

Artie,

I'll tell you what I know. The car does have a catalytic convertor but it does have the EBPV wired open and disconnected. I had a new Stebro dual exhaust installed when I purchased the car . As far as I know from the service receipts I have, there were no other modifications done to the engine. Let me know if anyone has any ideas.

Hollis

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