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Re: startup knock Posted by Goblin [Email] (#2224) [Profile/Gallery] (more from Goblin) on Mon, 15 May 2023 15:26:25 In Reply to: startup knock, calvin, Mon, 15 May 2023 10:53:20 Members do not see ads below this line. - Help Keep This Site Online - Signup |
So I have a 1988 Saab 900 turbo that I've had for 20 years and probably 10 or 15 years ago I started noticing a slight knocking noise but the car drove great boosted just fine but I always thought it was the thrust bearing starting to go out because the car has 240,000 miles on it. So I just took the car put it in the shop pull the motor apart lo and behold sticky valve. So the knocking was the piston pushing the valve back closed and doing that repeatedly for the last 15 years. There was an Ever So slight mark on the Piston nothing major so I did a valve job cleaned everything up put the motor back together probably have a couple of hundred miles on the freshly rebuilt motor sounds great runs great. And it sounded like a little man inside with a hammer. Just my experience hopefully you figure it out. Does it still boost?
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