I have a vw gti code p0507 & p0171 rpm varies from 800-1500 I'm told it doesn't have an Idle air control valve. what could be the fix
SOURCE: HIGH IDLE, 1500rpm
No, its the intake manifold gasket. This is a very common problem with the SL/SL1 engine. There are only three bolts around the #1 cylinder and no bridge in the block between #1 and #2 cylinders. The flexible factory gasket tends to pull out in this area.
A confirmation of this is to spray some carburetor cleaner, fuel injector cleaner or even WD40 on the gasket around the #1 cylinder and if it affects the idle in any way, its because its leaking.
Felpro makes a good replacement gasket.
SOURCE: Can you have the idle air control valve checked to see if good?
I had a similar problem all it was a the rubber boot after the sensor was sightly disconnected and produced the same code. I would even take it as far if there is a decent rip in the boot would also cause the problem.
and yes you can test it
SOURCE: 98 Chevy 5.0 fast idle
try cleaning the throttle plate with the right cleaner . from a auto parts store.
SOURCE: engine codes p1133 p0171 p0507 p0131 all at once
Per your description, it sounds like you have a vacuum leak.
Check all vacuum hoses at the engine, make sure no hoses are disconnected, cracked or damaged.
Disconnect each hose at the source on the engine and see if the engine idle stabilizes.
Let me know what you find and we can go from there.
Regards.
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