Do You Have To Manually Adjust The Idle Control Valve?

dobroman2001 · January 18, 2010

Hello, I have a '93 Suburban K1500. I just replaced the engine this weekend and during the process I cleaned the Intake Manifold with a power washer .... Anyway, the truck ran good for a day and when I got in this morning it would not start... fuel pump is working and I can press the gas pedal and it will start but runs rough. I remove the ICV and checked it (wasn't sure what to check!)... anyway, I put it back in but did not screw it in completly. The truck started fine. So, I am making a guess that this IAC is bad. The truck has 285K miles and this is the original so I though I would replace it. Question is: Is there any manually adjusting that has to be done or do I just re-install a new one and go for it?

Thanks,

Tab

Nytemare · January 18, 2010

Hello, I have a '93 Suburban K1500. I just replaced the engine this weekend and during the process I cleaned the Intake Manifold with a power washer .... Anyway, the truck ran good for a day and when I got in this morning it would not start... fuel pump is working and I can press the gas pedal and it will start but runs rough. I remove the ICV and checked it (wasn't sure what to check!)... anyway, I put it back in but did not screw it in completly. The truck started fine. So, I am making a guess that this IAC is bad. The truck has 285K miles and this is the original so I though I would replace it. Question is: Is there any manually adjusting that has to be done or do I just re-install a new one and go for it?

Thanks,

Tab

If there is a spacer don't lose it...but it should just screw in.

The IAC valve is basically a choke for a fuel injected setup. It allows metered air in the engine to burn with the enriched mixture that happens on start up. The valve should move freely(the little poppet on the end with the spring).

dobroman2001 · January 18, 2010

Hello, I have a '93 Suburban K1500. I just replaced the engine this weekend and during the process I cleaned the Intake Manifold with a power washer .... Anyway, the truck ran good for a day and when I got in this morning it would not start... fuel pump is working and I can press the gas pedal and it will start but runs rough. I remove the ICV and checked it (wasn't sure what to check!)... anyway, I put it back in but did not screw it in completly. The truck started fine. So, I am making a guess that this IAC is bad. The truck has 285K miles and this is the original so I though I would replace it. Question is: Is there any manually adjusting that has to be done or do I just re-install a new one and go for it?

Thanks,

Tab

If there is a spacer don't lose it...but it should just screw in.

The IAC valve is basically a choke for a fuel injected setup. It allows metered air in the engine to burn with the enriched mixture that happens on start up. The valve should move freely(the little poppet on the end with the spring).

OK, thanks... so the valve distance should be set from the factory? I will double check it with the one I took out of the car but I'm not sure that is correct. There may also be some instructions in the new one.

Nytemare · January 18, 2010

Hello, I have a '93 Suburban K1500. I just replaced the engine this weekend and during the process I cleaned the Intake Manifold with a power washer .... Anyway, the truck ran good for a day and when I got in this morning it would not start... fuel pump is working and I can press the gas pedal and it will start but runs rough. I remove the ICV and checked it (wasn't sure what to check!)... anyway, I put it back in but did not screw it in completly. The truck started fine. So, I am making a guess that this IAC is bad. The truck has 285K miles and this is the original so I though I would replace it. Question is: Is there any manually adjusting that has to be done or do I just re-install a new one and go for it?

Thanks,

Tab

If there is a spacer don't lose it...but it should just screw in.

The IAC valve is basically a choke for a fuel injected setup. It allows metered air in the engine to burn with the enriched mixture that happens on start up. The valve should move freely(the little poppet on the end with the spring).

OK, thanks... so the valve distance should be set from the factory? I will double check it with the one I took out of the car but I'm not sure that is correct. There may also be some instructions in the new one.

Distance would be set with a spacer if adjustment was needed.

dobroman2001 · January 19, 2010

Hello, I have a '93 Suburban K1500. I just replaced the engine this weekend and during the process I cleaned the Intake Manifold with a power washer .... Anyway, the truck ran good for a day and when I got in this morning it would not start... fuel pump is working and I can press the gas pedal and it will start but runs rough. I remove the ICV and checked it (wasn't sure what to check!)... anyway, I put it back in but did not screw it in completly. The truck started fine. So, I am making a guess that this IAC is bad. The truck has 285K miles and this is the original so I though I would replace it. Question is: Is there any manually adjusting that has to be done or do I just re-install a new one and go for it?

Thanks,

Tab

If there is a spacer don't lose it...but it should just screw in.

The IAC valve is basically a choke for a fuel injected setup. It allows metered air in the engine to burn with the enriched mixture that happens on start up. The valve should move freely(the little poppet on the end with the spring).

OK, thanks... so the valve distance should be set from the factory? I will double check it with the one I took out of the car but I'm not sure that is correct. There may also be some instructions in the new one.

Distance would be set with a spacer if adjustment was needed.

Update:

Installed the new ICV yesterday afternoon. It did have a small gasket that came with it. I checked to see if the original one had one or it was stuck to the Throttle body, did not see it. I installed the new one, the instructions stated that if the gap on the "needle valve" was larger than 1 1/8 inch, then a manual adjustment had to be made. Basically screw the thing out .... Mine was OK, so I installed it and all is well. Thanks for the comments.

Tab,

Nytemare · January 19, 2010

Hello, I have a '93 Suburban K1500. I just replaced the engine this weekend and during the process I cleaned the Intake Manifold with a power washer .... Anyway, the truck ran good for a day and when I got in this morning it would not start... fuel pump is working and I can press the gas pedal and it will start but runs rough. I remove the ICV and checked it (wasn't sure what to check!)... anyway, I put it back in but did not screw it in completly. The truck started fine. So, I am making a guess that this IAC is bad. The truck has 285K miles and this is the original so I though I would replace it. Question is: Is there any manually adjusting that has to be done or do I just re-install a new one and go for it?

Thanks,

Tab

If there is a spacer don't lose it...but it should just screw in.

The IAC valve is basically a choke for a fuel injected setup. It allows metered air in the engine to burn with the enriched mixture that happens on start up. The valve should move freely(the little poppet on the end with the spring).

OK, thanks... so the valve distance should be set from the factory? I will double check it with the one I took out of the car but I'm not sure that is correct. There may also be some instructions in the new one.

Distance would be set with a spacer if adjustment was needed.

Update:

Installed the new ICV yesterday afternoon. It did have a small gasket that came with it. I checked to see if the original one had one or it was stuck to the Throttle body, did not see it. I installed the new one, the instructions stated that if the gap on the "needle valve" was larger than 1 1/8 inch, then a manual adjustment had to be made. Basically screw the thing out .... Mine was OK, so I installed it and all is well. Thanks for the comments.

Tab,

Glad to hear everything is good.