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How do you adjust the idle speed on 92 350?

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2005-10-20 14:25:25
2005-10-20 14:25:25

I believe that is controlled by the ECM. If the engine is idling too fast, check the EGR valve. It is to the right (from the drivers perspective) of the throttle body. If the EGR valve is damaged or the gasket is missing it could allow the engine to idle far too fast.

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Idle slows down to a stall when you stop or slow down when AC is running. How do I adjust idle or is something else wrong?

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Computer controlled not adjustable

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AnswerLook for a black cap on the right side on top of the throttle body. Pop off that cap and there will be a screw under that cap to adjust the idle.

83xbrThe answer is that you can't adjust the idle speed on any car since the 80s, because the Feds mandated a design that allows only automotive shops to do that. If you need to increase your idle speed, you can cheat by finding the throttle cable linkage at the carb or throttle body. There should be a flat piece of metal to which the throttle cable is attached. The metal is hinged and spring loaded usually. When you step on the gas, the piece of metal hinges away from the carb/throttle body. The piece of metail serves as a stop when it hinges back to the carb/throttle body. Wrap a zip-tie or some other relatively thin material around the flat piece of metal and you will artificially keep it from returning to the lowest idle point. Use materials of differing thicknesses until you achieve the idle speed you want.

Yes,350 same block as 305 plus a few more my 92 has a 5.7 350 in it stock

I looked into this about 5 years ago. idle is not user adjustable and the 92 is factory set to idle very slow about 800 to 900 rpm. I think it is computer controlled. Incorrect sir. There is a bolt under where the accelator cable is connected that you can adjust and it WILL affect your idle, you can do this with a simple screw driver if you really feel that you need to.

your 92 350 is rated at 210 HP with 290 Ft/Lbs of torque

There is no adjustment screw, idle is automatically controlled by the pcm.

Im not sure about a 92, but when it happened to my 98, i had to replace the Idle control valve. its generally about 50 bucks and is very easily done.

The Firing order for a Chevy 350 is 18436572.

They'll bolt up, but not function properly. By the way, the 92 5.7 was not a Vortec engine.

Rough idle lacks power

You cannot adjust timing its done in the ecu

i think it might be a vacuum leak check the hoses on the engine and arount throttle body gasket with starting fluid and if you have low power also then it is probably the fuel pump in the tank(check filter first), have fuel pressure tested. my bet is vacuum leak though. Randy

It's the same as the Throttle Position Sensor--it's on the front side of the throttle body just left of the plenum--its probably gray or black--if you loosen the top screw you can adjust it to the left or right.

My Chilton Says 1990 -92 Idle IN Park At Operating Temp Should Be 750, in drive 700, i cant ever seem to make the rpm drop only 50rpms when putting in park, so mine is set to 800, and about 700 in drive

next to the thermostat housing.

Reprogram?? I don't know if you can reprogram the idle but there is a idle adjustment screw on my 91 right under the intake.... Try adjusting thatu might need a idle air control valueAnswerThere is no fast idle speed screw on a fuel injected motor. Check the Idle Air Control valve, the Throttle Position Sensor, and the Mass Airflow sensor before you go digging around with the ECM. first 91 has a 5.0 92 has a 4.6 there is a stop screw that can be adjusted but i don not recommend it i would try the above

Idle could possibly be too low.


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