Lumina L4-151 2.5L (1991)
Throttle Body: Service and Repair
Throttle Body Cleaning
CAUTION: The throttle bore and valve deposits may be cleaned on the vehicle, using carburetor cleaner and a parts cleaning brush. Do Not use a
cleaner that contains Methyl Ethyl Ketone. It is an extremely strong solvent, and not necessary for this type of deposit.
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The throttle body parts may be cleaned following disassembly, in a cold immersion type cleaner such as GM X-55 or equivalent.
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The Throttle Position Sensor (TPS) and Idle Air Control (IAC) valve should not come in contact with solvent or cleaner, as they are electrical
components and may be damaged.
Idle air control valves (new and used) have a special factory applied coating to the threads. If the valve is removed and is being reinstalled, avoid
removing any of the thread locking compound that may be remaining on the threads. Clean IAC pintle valve seat, air passage and gasket sealing surface.
Do not use cleaners that contain Methyl Ethyl Ketone. It is too strong of a solvent to be used on throttle body components. No further cleaning of throttle
body components should be necessary.
