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Not normal Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Tue, 14 Jun 2005 10:29:29
In Reply to: 89 C900 TC warm up, Rencey, Mon, 13 Jun 2005 21:56:19 Members do not see ads below this line. - Help Keep This Site Online - Signup |
If the gas pedal seems to ignore you when the car is cold, I would suspect the AMM (air mass meter). Hesitation at part throttle is classic bad AMM. When the car is cold, the O2 sensor is not in the circuit, and the engine control relies soley on the AMM for scheduling fuel. It could be other issues, but AMM comes to mind. You can buy rebuilt units from the various vendors on the BB (see the bottom of the page) for MUCH less than the dealer. You can install it yourself very easily.
The knock is not good. The engine should never knock. What grade of fuel are you using? You may need to be running higher octane. The APC system in the turbo system should be preventing knock, but it can do that only by reducing boost. Knock in a turbo engine can damage it. The question would be, is it really knock? Are you hearing a rattle from the engine when cold, and assuming it is knock? If you hear the noise at idle, then it isn't knock, but rattle. If you hear it at speed with the engine loaded (like going up a hill at low RPM), that would be knock.
The Saab engine can be pretty rattly cold. It could be the timing chain. Most likely it is a sticky hydraulic valve lifter that is taking it's time pumping up. That's not a problem.
posted by 192.249....
, Tue, 14 Jun 2005 10:29:29 <-- Viewing This Message
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