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Back firing?[900/1995] posted by Jim Wilson on
Saturday, 18 September 1999, at 8:24 p.m.
I was unable to respond to your message earlier because of an unclear e:mail address.
The car is a 945T and, after fully warmed up 30-45 minutes on the highway), makes a "pupp pupp pupp" sound when on the highway and backing off the accelerator. The sound seems to be eminating inside a "tin can" and is not loud at all. If I had to guess, I would say that unburned fuel/air mixture is getting into the exhaust system. Your help will be appreciated. Please indicate your e:mail address if you need further input from me. Thanks for your help.
--JIm Wilson
Re: Back firing?[900/1995] posted by abe crombie on
Saturday, 18 September 1999, at 10:01 p.m.
The injectors should go off on coast. This is controlled by the fuel control unit being able to see closed throttle via the throttle switch. If that isn't adjusted properly or has a faulty internal switch then the injectors may not be off on coast and you may very well be hearing a weak backfire in exhaust.