hope for bad AMM...may be the headgasket - Saab 900 Bulletin Board - Saabnet.com
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hope for bad AMM...may be the headgasket
Posted by JohnK (more from JohnK) on Wed, 16 Jan 2002 14:07:20
In Reply to: Rough rider -- warmup problems?, Tim B., Wed, 16 Jan 2002 08:26:56
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An AMM on the way out will start with wide swings at idle when cold that diminish as the engine warms up and the O2 sensor takes over. This progresses to hesitation problems and flat spots under acceleration regardless of temperature, and finally to chugging, coughing and black smoke. At the final stage, you may not want to run the engine long enough to warm up.
Try the AMM swap out method, but also look for air bubbles in the coolant expansion tank that become a steady stream when the engine is revved up. This would be a sure sign that you have a partially blown headgasket that is allowing coolant to get into a cylinder or two after the engine sits for awhile. This coolant burns off after a few minutes of very rough running. Also look for an oily film on the coolant surface and a frothy/cheesy goop on the oil dipstick. Finally check the spark plugs for one(two) that is extremely clean from the coolant being burned in its cylinder(the rest have a yellowish brown residue. A compression check or coolant pressure leakdown test will also show leaks.
posted by 216.75....
Posts in this Thread:
- Rough rider -- warmup problems?, Tim B., Wed, 16 Jan 2002 08:26:56
- warmup problems=BAD CTS., RJ, Wed, 16 Jan 2002 18:34:06
- hope for bad AMM...may be the headgasket, JohnK, Wed, 16 Jan 2002 14:07:20 <-- Viewing This Message
- Re: Rough rider -- warmup problems?, Jason Y, Wed, 16 Jan 2002 12:13:26
- Re: Rough rider -- warmup problems?, Jake
, Wed, 16 Jan 2002 09:58:09 - Probably AMM..n/m, Tyler A, Wed, 16 Jan 2002 09:15:55
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