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If you know that the changeover valve is broken then you need to replace it. As for the fault, check for a broken vacuum hose, or leak and if so repair and retest . If vacuum hoses are fine and no vacuum leaks check to see if your combi valve is bad and leaking, it is very easy to tell there will be a loud hissing noise under the intake manifold when the engine is running. if that is ok check the mass air flow sensor, and the oxygen sensors.
What else can I help you with?
Manifold fitting should be repaired by?
replacing the fittings
Do you need to remove the intake manifold when replacing the exhaust manifold on jeep Cherokee Laredo 4.0?
Yes.
How do you fix a oil leak from intake manifold gasket?
By replacing the whole gasket.
How do you change the thermostat on a 2000 Chevy Lumina?
do i need to change the manifold when replacing thermostat
Is there a gasket on the intake manifold for 1995 aurora olds?
i am replacing the starter on olds 1995 aurora
How come you keep replacing the same fuel injector it keeps leaking?
Cracked intake manifold...
What is a bistellar flip?
A bistellar flip is another term for a Pachner move, any of a set of ways of replacing a triangulation of a piecewise linear manifold by a different triangulation of a homeomorphic manifold.
What is the cost of replacing an intake manifold gasket for a 1999 Chevy S-10 4.3 liter?
About 450.00
What is the labor cost of replacing the manifold gasket on a 1998 Chevy Malibu?
Intake manifold or exhaust? The complete job (parts and labor) is between $700-$900. depending on labor rates.
Why is there noticeable suction into the crankcase when the dipstick is pulled with the engine running after replacing the intake manifold gasket?
It's supposed to do that.
Is replacing a radiator normal procedure when replacing a intake manifold gasket?
Absolutely not. The two are not related in any way. If this was just a personal concern, just replace the intake manifold gasket. If this was what a repair station has quoted or already charged you for, Id go somewhere else or talk to a lawyer respectively.
How do you know the heater hose needs replacing?
You know the heater hose on a vehicle needs replacing when it beings to swell and soften. The heater hose runs from the intake manifold to the heater core.
