Re: 91 9000t with high speed shutter under load on hill - Saab 9000 Bulletin Board - Saabnet.com
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Re: 91 9000t with high speed shutter under load on hill
Posted by JK (more from JK) on Sun, 3 Jul 2005 11:06:15
In Reply to: 91 9000t with high speed shutter under load on hills, Tony, Fri, 1 Jul 2005 22:20:00
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Tony, a few things to check:
Boost pressure - around 13 psi max (if it's up near 17 or 18 you might be hitting fuel cutout) cause>> turbo wastegate stuck or leaky hose from APC or APC valve stuck)
Intake hose leak - check all hoses and fittings from airbox to intake manifold. Leaks will cause mass airflow sensor to lose track of how much air is getting into the system.
Spark plug gap - this is critical on a turbocharged vehicle. Make sure it is as close to reccomended as possible.
Turbo bypass valve - a leaky BPV can do funky things. Check the quasimotors website for a quick test.
Fuel pressure regulator - on occasion the fuel pressure regulator's diaphragm can split, causing raw fuel to be pushed directly into the intake through the attatched vacuum hose. This usually worsens to the point where the car will no longer start. (This happened to me and took me almost 2 months to diagnose on my old '86) Additional symptoms will include backfiring, black smoke and foul language.
Expensive solutions could include replacing DI casseste, or Mass Air sensor. Lets hope this isn't the case.
Let me know what happens, or if I can offer any more help.
- Joe
posted by 68.23.79...
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