I changed the thermostat. To do that, I had to remove and replace the throttle body. Now the van won't idle at all. The only way it will stay running is if I keep a foot on the gas pedal, which has resulted in a racing motor[4500rpm] when not in gear
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Re: throttle body removed and replaced
I'm not a chevy guy, but I think you need to reset the throttle position sensor (TPS) once it's disconnected.
For idle, the throttle plate is almost closed with just a little air getting through. For more air, an IAC idle air control valve lets more air in to maintain an ilde speed. The TPS tells the engine computer when the throttle plate is closed and then the computer tells the IAC to let more or less air in to maintain idle.
So, as long as you reconnected all the connectors you took off, I'm guessing you just need to make some readjustments. Calling your Chevy dealer service department, they can tell you if that's true.
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clean throtle body and idle air control motor with air and indution cleaner use old tooth brush on throttle body having helper to hold throttle open helps alot. and remove i.a.c. fill with cleaner let soak blow out and replace if does not fix you have vacume leak on engine
first you need drain engine coolant down below thermostat. what engine type 3.8 or 3.4 need to know.the 3.8 engine thermostat housing on top intake follow top radiator hose to thermostat housing.the 3.4 engine you have to remove air filter housing with air inlet duct with mass air flow sensor.you have to remove throttle body with coolant hoses.go to auto parts store buy new throttle body hoses old ones will be hard to remove might have to cut two small hoses also buy new throttle body gasket also. before you can remove throttle body unit you have to remove accelerator cable and downshift cable from bracket bolted to throttle body.once throttle body remove then you can remove thermostat housing bolt remove replace thermostat.
FIRST YOU HAVE TO DRAIN COOLANT LEVEL BELOW THERMOSTAT THEN.TO REMOVE THERMOSTAT YOU HAVE TO REMOVE AIR FILTER DUCT AND MAF SENSOR TOGETHER.HAVE TO DISCONNECT ACCELERATOR CABLE AND TRANSMISSION SHIFT CABLE FROM THROTTLE BODY BRACKET. YOU HAVE TO REMOVE THROTTLE BODY UNIT REMOVE THE SMALL COOLANT HOSES FROM THROTTLE BODY,YOU NEED TO GO TO DEALERSHIP TO BUY THE SMALL COOLANT HOSES ATTACHED TO THE THROTTLE BODY.WHEN YOU REMOVE THE THROTLLE BODY UNIT.THEN YOU CAN REMOVE THERMOSTAT HOUSING TO REPLACE THERMOSTAT.YOU NEED TO BUY NEW THROTTLE BODY GASKET DONT REUSE OLD ONE.IF DO YOU WILL GET A VACUUM LEAK AND HAVE HIGH IDLE PROBLEM.
WELL YOU NEED TO DRAIN COOLANT LEVEL BELOW THERMOSTAT LEVEL.YOU HAVE TO DISCONNECT MAF SENSOR LOOSEN AIRDUCT 2 LARGE CLAMPS LOOSEN REMOVE 4 SCREWS TO AIR FILTER COVER LIFT UP REMOVE COVER. THEN REMOVE AIR FILTER AND HOUSING, FIRST DISCONNECT MAF SENSOR.YOU HAVE TO DISCONNECT THROTTLE CABLE AND SHIFT CABLE.YOU HAVE TO DISCONNECT REMOVE THROTTLE BODY COOLANT HOSES DISCONNECT IDLE SPEED CONTROL VALVE CONNECTOR AND DISCONNECT TPS SENSOR CONNECTOR. THEN REMOVE THROTTLE BODY ASSEMBLY. YOU NEED TO BUY NEW THROTTLE BODY COOLANT HOSES AND NEW THROTTLE BODY GASKET FOLLOW TOP COOLANT HOSE TO ENGINE BLOCK.NOW YOU SEE CAN AND REMOVE THE THERMOSTAT HOUSING REPLACE THE THERMOSTAT.BESURE TO HAVE EXTRA COOLANT ON HAND.BLEED COOLANT SYSTEM WHEN DONE.TO BLEED COOLANT SYSTEM REMOVE RADIATOR CAP ON OVERFLOW JUG.THEN OPEN BLEED SCREW ON THE WATER PUMP BYPASS HOSE PIPE JUST A LITTLE.POUR COOLANT IN THE OVERFLOW JUG UNTIL LEVEL STOP DROPPING.STOP AT COLD MARK ON JUG.CLOSE BLEEDER SCREW ON WATER PUMP BYPASS HOSE PIPE.CRANK VECHICLE CHECK FOR LEAKS. START UP ENGINE LET IDLE FEW MINUTES THEN CHECK COOLANT LEVEL ADD MORE UNTIL UNTIL LEVEL STOP DROPPING.PUT RADIATOR CAP BACK ON OVERFLOW RESERVOIR. LET ENGINE IDLE WATCH COOLANT TEMPERATURE GAUGE.WHEN GAUGE START CLIMBING. TURN OFF ENGINE WAIT FEW MINUTES TAKE A LARGE RAG OPEN RADIATOR JUST A LITTLE YOU HEAR HISS NOISE.WHEN PRESSURE STABILIZE DONT GET SCALDED BECAREFUL.OPEN CAP LITTLE MORE.IF COOLANT PRESSURE STILL BOILS OUT WAIT 20 MINUTES ADD MORE COOLANT TO RADIATOR OVER FLOW WHEN COOLANT LEVEL STOP DROPPING.PUT RADIATOR CAP BACK ON START VECHICLE UP LET IDLE UNTIL THERMOSTAT OPEN. THEN FEEL TOP RADIATOR HOSE FEELS HOT THERMOSTAT OPEN WATCH TEMPERATURE GAUGE.IF GAUGE TEMP START CLIMBING TURN OFF ENGINE WAIT A WHILE.CHECK AND ADD MORE COOLANT.WHEN THE ENGINE CAN IDLE TEMP GAUGE STOP CLIMBING YOU HAVE BLEED COOLANT SYSTEM.KEEP CHECK ON COOLANT LEVEL.
You'll have to remove the throttle body to replace the idle air control (IAC) valve. First, disconnect the negative ground cable from the battery. Then remove the vacuum line and air duct intake. Then disconnect the IAC and throttle position sensor (TPS) electrical connections. Remove the coolant hoses that are connected to the IAC. Disconnect the throttle cable from the throttle body. Now, remove the 4 bolts that hold the throttle body to the manifold and remove. Be careful with the gasket located between the throttle body and manifold and replace it in the same position. On your clean work surface, turn the throttle body over and remove the 4 phillips head screws holding the IAC to the throttle body. Clean the parts with a dry cloth but do not use solvents on the IAC or TPS. That's it!
Try removing the idle speed motor on side of throttle body, and spray it clean, as well as the port it came out of, with throttle body spray cleaner. Don't pull and extend shaft of idle motor, just leave it in position it's in, and make sure you don't lose small "O" ring on idle motor. Re-install and try it. If it cures it for a while, then starts to do it again, replace the idle speed motor.
the thermostat is under the throttle body
1 remove the air inlet tube from the throttle body to air box
2 drain the coolant
3 remove the throotle body
4 the top bolt is easy remove 13mm bolt from thermostat housing
5 the bottom bolt not so easy remove 3/4 of the way out bottom hole on housing is slotted
6 remove thermostat housing
7 replace thermostat and reassemble
hope this helps
FIRST OF ALL YOU HAVE TO DRAIN SOME COOLANT.JUST ENOUGH SO COOLANT WONT FLOW ALL OVER ENGINE.AND COOLANT TO EXPENSIVE ON THE GROUND.TO GET TO THERMOSTAT.YOU HAVE TO DISCONNECT CONNECTORS TO MAF EGR IDLE SPEED CONTROL AND IAT SENSOR.. REMOVE THROTTLE AND SHIFT CABLES FROM BRACKET.REMOVE AIR FILTER ASSEMBLY WITH MASS AIR FLOW SENSOR.REMOVE BOTTOM PORTION OF AIR FILTER HOUSING.REMOVE COOLANT HOSES FROM THROTTLE BODY.THEN REMOVE THROTTLE BODY ASSEMBLY.YOU HAVE TO DISCONNECT SMALL COOLANT HOSE TOP WATER PUMP.REMOVE SMALL BOLT THAT HOLDS METAL COOLANT LINE TO WATER PUMP.THIS LINE HAS TO BE MOVE JUST ENOUGH SO YOU CAN REMOVE THROTTLE BODY.ONCE THROTTLE BODY OUT THE WAY YOU CAN REMOVE THERMOSTAT.BESURE WHEN YOU PUT EVERYTHING BACK TOGETHER.REPLACE THROTTLE GASKET AND THE COOLANT HOSES COME OFF THROTTLE BODY BESURE TO USE OLD COOLANT HOSES MEASUREMENTS FOR NEW HOSES MEASUREMENTS MAKE SURE YOU BUY THE CURVE HOSE FOR THROTTLE BODY. DONT TRY TO USE STRAIGHT HOSE IT WILL KINK AND CAUSE NO COOLANT FLOW.WHEN YOU ARE DONE.FILL COOLANT BACK TO CORRECT LEVEL AND BLEED COOLANT SYSTEM.
hi.... It is actually buried under the air cleaner. first remove the air cleaner tube,
throttle body, the thermostat is just below the throttle body in the
aluminum cast housing. two bolts to remove, one was easy the other was
a real $%&^!!. It is behind the exhaust cross over tube. Good luck. TIP - use WD-40 on the air cleaner tubing to get
it to go back on the Throttle body.
It isn't as easy as changing a thermostat sounds.
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change air filter.clean throttle plates.remove throttle body remove all electrical parts also all plastics and rubber parts.clean throttle body with gum out throttle body cleaner.dry off throttle body.replace gasket.scan it to check to see if egr valve leaking.also check all vacuum hoses.and pvc valve.