Re: Idle at start-up stumbles badly... - Saab 9000 Bulletin Board - Saabnet.com
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Re: Idle at start-up stumbles badly...
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Posted by sully (more from sully) on Tue, 8 Jun 2004 09:56:22 Share Post by Email
In Reply to: Idle at start-up stumbles badly..., Joe98, Tue, 8 Jun 2004 09:02:56
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When my HG went out, the car basically ran fine. Compression was good across all 4 cylinders. What happens is that the cylinder will leak exhaust gas into the coolant passage. This pressurizes the cooling system, causing lots of other issues. At first I blew the top radiator hose coming off the t-stat. Then the coolant tank started to overflow a few weeks later. The coolant wasn't boiling, just pressurized from the exhaust gas. Look at the front of the expansion tank when you first start the car. When my HG got real bad, I could see air bubbles rising out of the hose that came from the water pump. Also pull your plugs and shine a bright light down into each cylinder. My final clue was that each piston looked flat black like charcoal. Except piston #1, it was sludgy and glistening in the light. This was the coolant cleaning the carbon off the piston top. I actually had a shop diagnose my HG before I tore into the job. Have your coolant system pressurized and a leak down test. HG was actually not a hard job, just lots of time. Post back if it's the HG, lots of info here and a Haynes manual was all I had to do it.

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