Date: Sat, 05 Aug 2000 14:31:24 GMT
From: "Ask The MasterTech" <>
Subject: Re: engine running rough on acceleration

Sounds like fuel pressure or a possible reluctor in the distributor failing. Hopefully this will help. TW <> wrote in message news:8m9jqf$23g$ > Been having a problem with my 900. It's an '85, 8 valve no turbo. > Engine running rough at high(er) RPMs. > > For the most part it runs smoothly, but on acceleration (toward > 4000+ RPM) there is an all-of-a-sudden significant power loss and > it sounds like one of the cylinders is firing out of sync. When > this starts, it doesn't stop without letting off of the gas > pedal. At worst case this has started as low as 2500 RPM and can > make the whole engine really shudder. > > Also, about this time, there seems to be a lot of backfiring if I > downshift toward a stop. I think this is why I've now got a new > hole in the front exhaust pipe. (or is it the other way around?) > > I've replaced ignition plugs & wires, distributor cap & rotor, and > set the timing. It was high (25 deg.), I brought it back to 22, > then 17. Still no change. Next I'll check the fuel filter and the > ignition coil, but I'm fast running out of ideas. > > Could a soon-to-be-failing fuel pump cause this? What about fuel > mix? (haven't noticed discouloured exhaust...). > > Aside from the rumble from the new hole in the front pipe, at > lower RPM ranges, you wouldn't know there was a problem (except > for the backfiring). > > Suggestions as to what else I can check would be greatly > appreciated! > > Regards, > -chris > > > Sent via > Before you buy.

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