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View Full Version : over reving


longhorn
03-31-2011, 07:54 PM
2000 Chev with a 454
Its overevving like a automatic choke sticking but seeing how it doesnt have a auto choke anyone know what might cause it.

pumpkin
03-31-2011, 07:59 PM
Vacume leak is the most common problem. On a FI engine this is called false air. You can check by hooking up a scanner and looking at the iac count.



BoBs Auto opening soon















Maybee[36]

longhorn
03-31-2011, 08:42 PM
Vacume leak is the most common problem. On a FI engine this is called false air. You can check by hooking up a scanner and looking at the iac count.

Thank you ..................



BoBs Auto opening soon















Maybee[36]

ottoman
03-31-2011, 11:23 PM
or maybe dead coolant sensor or thermostat may be stuck open

longhorn
04-08-2011, 08:45 AM
I put in a new coolant sensor.
It almost seems to have made a diffrence but not on every start?

epic3
04-08-2011, 11:21 AM
or maybe dead coolant sensor or thermostat may be stuck open

dead coolant sensor would lead to it running real rich all the time and in the extreme that I've seen actually flood out