Re: Only boosting to 8psi. (A little long). - Saab 900 Bulletin Board - Saabnet.com
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Re: Only boosting to 8psi. (A little long).
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Posted by Rose quartz 87 [Email] (#2119) [Profile/Gallery] (more from Rose quartz 87) on Mon, 15 Jun 2020 20:53:39 Share Post by Email
In Reply to: Re: Only boosting to 8psi. (A little long)., Landjet [Profile/Gallery] , Mon, 15 Jun 2020 19:31:11
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Thanks for the response.
I'll take a look at the plugs. When I last checked the piston tops were clean, not water blasted as I mentioned before, but no visible hot spots.

I'll check for any missing bolts underneath the manifold and throttle body.

I found a hardened end on one of the solenoid hoses. Had a spare so swapped it in. I'll test again tomorrow to see if there's any difference now it appears nice and tight on there. There was a little oil in the hose coming from the turbo up to the apc solenoid.

The only other thing I can think of now is a vacuum leak, bad timing due to the slight compression change or heat in the cylinders caused by rusty water jackets causing the spark knock. Think I'm going to try a thermocure cleaning. I've read good things. Maybe they were paid for editorial good things, but worth a shot if it doesn't do any harm.

So thankful that the knock sensor is doing its job. At least that works!

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