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Cold Start Oscillation Posted by Larry Daggert [Email] (#654) [Profile/Gallery] (more from Larry Daggert) on Thu, 23 Feb 2012 13:22:22 Members do not see ads below this line. - Help Keep This Site Online - Signup |
I have a 2003 SAAB 9-5 Aero With 107,000 miles on it. I have a cold idle problem. The car starts rough, revs oscillate to 1500 RPM and back to 700 after a few minutes as the car warms the problem clears and once the car is hot It can be restarted all day long without noticing any problem. Codes that it throws are P0455 and P044. and random misfire. I tested the Evacuation Pipe Purge Valve and it works fine. It acts like a massive vacuum leak but in a smoke test nothing was found.
Recent repairs are all new vacuum hoses, new throttle body, new Mass air flow, new manifold absolute pressure sensor, new gas cap, replaced the intake manifold gasket. New DI cassette.
Where do I go next? what additional tests can I perform?
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