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1997 BONNEVILLE SE FUEL INJECTED RPM HIGHER THAN EXPECTED…

Customer Question
1997 BONNEVILLE SE FUEL INJECTED...
1997 BONNEVILLE SE FUEL INJECTED
RPM HIGHER THAN EXPECTED
Submitted: 8 years ago.Category: Pontiac
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Answered in 5 hours by:
6/15/2010
Pontiac Mechanic: FIXITMAN, Mater Technician replied 8 years ago
FIXITMAN
FIXITMAN, Mater Technician
Category: Pontiac
Satisfied Customers: 17,611
Experience: ASE MASTER CERTIFIED, AA DEGREE AUTO/DIESEL TECH
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Hello JACUSTOMER, does it have a higher than normal idle?
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Customer reply replied 8 years ago
THE OBD SAYS IT DOES. WE BOUGHT THE CAR USED ,AND I DON'T KNOW HOW THIS ENGINE NORMALY IDLES
Pontiac Mechanic: FIXITMAN, Mater Technician replied 8 years ago
The engine should idle around 600 rpm. What is it idling at?
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Customer reply replied 8 years ago
ITS IDLING BETWEEN 1000 AND 1200 RPM
Pontiac Mechanic: FIXITMAN, Mater Technician replied 8 years ago
Okay. This is too high. Most of the time this is due to a vacuum leak. It may be a bad vacuum hose or intake manifold gasket. It is common for this gasket to fail. Check all of the hoses on the engine for cracking as this will cause this. You can also try cleaning out the throttle body. If it has a lot of build up in it then this will happen. Remove the air intake hose and spray it out with throttle body cleaner.
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Customer reply replied 8 years ago
thank you when i take off the engine oil cap the car idles down does this pinpoint any particular vacuum problem
Pontiac Mechanic: FIXITMAN, Mater Technician replied 8 years ago
This does point to a bad intake manifold gasket.
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