1979-1993 & 94 Conv [Subscribe to Daily Digest] |
 | [Main C900 Bulletin Board | BBFAQ |
Prev by Date | Next by Date | Post Followup ]
Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
Re: Poor acceleration Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Thu, 9 Nov 2006 09:23:49
In Reply to: Poor acceleration, twells  [Profile/Gallery]
, Thu, 9 Nov 2006 03:49:32
Members do not see ads below this line. - Help Keep This Site Online - Signup
|
The hose coming off the throttle body isn't that unusual. It's a big hose, and over time an oil film gets into the system and coats everything. On my '86, the hose clamp just wasn't enough - I ended up adding a piece of rope (high-tech, I know) to hold the hose in place.
At first blush, it sounds like there are a lot of unknowns with the car. Step one is to reduce them. I'll bet you don't have any maintenance records. So step one, do a complete tune-up. Replace the spark plugs with a good set of NGKs or Bosch. Gap them per the spec on the decal in the engine compartment. Replace the spark plug wires, cap and rotor. Set the timing per the decal in the engine compartment. Replace the air and fuel filter. Inspect all hoses, especially the thin vacuum hoses. Look for cracking, especially where they meet nipples.
How did the spark plugs you pulled out look? Were they black, indicating rich running? White, indicating lean? Good information to know.
Fill the tank with high octane (92 or 93, US) fuel. Yeah, it costs more, but you're trying to get a baseline on an otherwise unknown car. The APC system adjusts performance to fuel octane; poor gas can mean poor performance. Every engine is different, and they become more different as they age. Some cars can get by with lower octane gas (lower compression due to wear). Some need higher octane with age (carbon buildup increasing compression, hot spots in the cylinders). Usually it's a combination. But to get an idea, run the best gas you can. After the car is fully sorted, then you can start cutting down on the octane. When you see a performance hit you find objectionable, you know what octane this particular car needs.
It sounds like a problem at boost. Bad wires, too big a spark plug gap, incorrect timing can all cause misfiring under boost. If the APC is detecting knock, it will cut back on boost, giving you the feeling of surging followed by lack of power. Knock would be wrong plugs, poor fuel, incorrect timing.
posted by 192.249....
, Thu, 9 Nov 2006 03:49:32, Thu, 9 Nov 2006 09:23:49 <-- Viewing This Message, Sat, 11 Nov 2006 12:20:51
No Site Registration is Required to Post - Site Membership is optional (Member Features List), but helps to keep the site online
for all Saabers. If the site helps you, please consider helping the site by becoming a member.
 |
 |
 |
 |
 |
