FUEL SYSTEM AND THROTTLE BODY 5-15
THROTTLE BODY CLEANING
• Use a swab moistened with a carburetor cleaner (petroleum
solvent) to clean the passageways, throttle valve, and main
bore and then dry the cleaned surfaces with compressed air.
INSPECTION
Check following items for any damage or clogging.
Replace the damaged part if necessary.
* O-rings
* Throttle valves
* ISC valve hose
* Fuel delivery pipe
* Cushion seals
* Fuel injectors
Some carburetor cleaning chemicals, especially
dip-type soaking solutions, are very corrosive and
must be handled carefully. Always follow the chemical
manufacturer’s instructions on proper use, handling
and storage.
Do not use wire to clean passageways. Wire can dam-
age passageways.
Never spray a cleaner (petroleum solvent) directly to
the throttle valve and ISC bypass passage.
The cleaner, if splayed, would work its way into the
inside of the ISC valve and attack the insulation film of
the coil there, causing a short circuit and eventual
malfunction of the ISC valve. In addition, if a short cir-
cuit occurs in the coil, an over current would flow
through the ISC valve drive circuit causing the ECM to
break down.
When the throttle valve is molybdenum-coated, avoid
applying the cleaner to the coated surfaces.
The cleaner will peel off the coating and this will
impair the air-tightness of the throttle valve.
If the components cannot be cleaned with a spray
cleaner it may be necessary to use a dip-type cleaning
solution and allow them to soak. Always follow the
chemical manufacturer’s instructions for proper use
and cleaning of the throttle body components. Do not
apply carburetor cleaning chemicals to the upper and
plastic materials.
