STILL dying on decel... plus more performance issues - Saab 900 Bulletin Board - Saabnet.com
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STILL dying on decel... plus more performance issues
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Posted by RadioFlyer [Email] (more from RadioFlyer) on Mon, 18 Mar 2013 07:23:56 Share Post by Email
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So I've been trying to figure this one out for the last month or so and its getting pretty frustrating. '90 SPG, 222k miles, red top injectors, modified red box, 3.0bar fpr, jak stoll EPROM. Before putting in the EPROM, she idled terribly and jerked around on acceleration. EPROM leveled things out and made her run healthy, but as soon as I would hit the turbo, every time i pushed the clutch in after that, the RPMS would drop off and the engine would stall. Now I have tried replacing almost everything (see list below), and still the same problem. So after startup in the morning, she runs great! Until I hit boost. Then the idle goes funky, CEL comes on, engine dies on decel, and the brake fluid light comes on for the rest of the day.

Have replaced: all vacuum hoses, charcoal canister, BOV (put in a Viggen BOV), MAF (replaced and cleaned), IAC (replaced and cleaned), ECU (tried different chips too), intercooler, all intercooler hoses and couplers, checked TPS (seems good - clicks as soon as the throttle is touched), cleaned major grounds, cleaned throttle body, replaced rubber grommets on the intercooler and PCV, replaced APC selinoid, spark plugs (NGK), cap, rotor, and a ton of other stuff.

Anyone have any other ideas to try?
I was thinking that maybe because the brake fluid light comes on when the problems start that it could be a ground issue. If it is, I still have not been able to find it. Cleaned major grounds under the fuel rail and radiator. If I can't figure it out soon, I'm considering bringing totally back to stock and diagnosing from there. Any help would be appreciated.

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