90 SPG backfire when high boost - Saab Performance Bulletin Board - Saabnet.com
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90 SPG backfire when high boost
Posted by Dave [Email] (more from Dave) on Sun, 18 Sep 2005 05:58:53
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I tried this on the C900 board and tried to replace plugs as suggested butI still have the problem. 90 SPG modified APC- RRFP, 160K,
boosts 1/3 red- at least it used to. Now, when boost goes top of yellow I get exhaust backfire, of course no power either, until I back off slightly -can't put it to the floor with out backfire when boost rises. I replaced the headgasket and put a "sporty" exhaust on it a while ago. I'm not certain if the backfire coincided with the h/g and new muffler.
Any ideas? Could it be not enough back pressure from muffler or...?
Thanks- this has been going on too long.
Dave
90 SPG
99 Viggen
posted by 209.23.169...
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