Date: Thu, 03 Aug 2000 11:11:51 +0200
From: Robert Brown <>
Subject: Re: engine running rough on acceleration

Hi, A quick story about my 1983 99 car from a few years back: Had a similar problem that I cured by replacing the capacitor that sits between the ignition coil and the distributor cap. This capacitor is screwed onto the left side of the distributor (from the driver's perspective). Another symptom cured by the same fix was that the rev counter hopped about under hard acceleration. Weird. Now - for non-turbos at least, the 1983 cars use points for controlling ignition; the 1985's use a Hall effect transducer I believe, which mean that there may be no capacitor as I described (best you check this). In which case pls ignore this mail ;-) If you're wondering about fuel mix, check the colour of the residue on the *old* spark plug electrodes. Should be a greyish brown colour. Whiter than that, it's a sign that you may have been running too lean. Regards, Robert Gothenburg 1983 900 8v carb 1999 9-3 16v tons of electronic shit 1983 99 8v carb (r.i.p.) chris ault wrote: > 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.

Return to Main Index

The content on this site may not be republished without permission. Copyright © 1988-2020 - The Saab Network -
For usage guidelines, see the Mission and Purpose Page.
[Contact | Site Map | on Facebook | on Twitter | Shop Amazon via TSN | Site Donations]