thanks for the info


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The IAC regulates the amount of air that is introduced into the TB and intake, so it is essential for a smooth idle. The IAC plunger moves in and out of the IAC orifice on the TB in relation to engine speed and RPM, based on what the PCM tells the IAC to do. When the IAC gets gunked up with soot and carbon, it can not work as well so that is why a dirty IAC can cause a stumble or rough idle.

The IAC is located on the back side of the throttle body, facing the firewall. It is best to disconnect the throttle cable, cruise control cable and TV cable if you have those. Then unplug and remove the IAC, Manifold Absolute Pressure (MAP) sensor and the Throttle Position Sensor (TPS) from the TB. Then you can remove the TB and thoroughly clean it. I use TB cleaner and a tooth brush and a shop rag. Clean both sides the butterfly plates and the bores, and the rest of the TB. When you clean the IAC use a shop rag soaked in TB cleaner, you need to clean the black crusty crud off the pintle end of it. Do not drop the IAC or handle it roughly or you will need a new one. Spray the TB cleaner down into the bore of the IAC piston and work it back and forth by hand so the piston will move easier. Pull the IAC piston back into its approximate original position and lube the O-ring with a little clean motor oil before re-installing the IAC. Also clean the inside of the IAC orifice with TB cleaner, get as much of the black crud out of there as possible, use Q-tips if needed. Then lube all of the pivot points and linkages on the TB with spray silicone and re-install the TB using a new TB gasket. A new TB gasket costs about $2.00 at most any parts store.

You should have a much better idle and a smoother running truck after cleaning the TB and IAC.

Jimmy

 

So I thought I would share with everyone, I took the info and cleaned the TB and the IAC really clean today. I must say that it did make a difference. The RPM will stay at a steady mark when at an idle and the shaking has almost completly gone away. Thanks to everyone for the tips and info.


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Example? Come to a stop don't give it gas and just let it role; truck goes shake shake shake felt in the seat truck in general?

If yes many people have this issue and non have a resolution as of yet. We are chasing our tails.

 

Just did the one in Son- laws car. It was running at 500 rpm's. After cleaning at 800 rpm's steady

 

so it has been a little over 2 weeks and the peoblem is back again. it has the same shake to it. after cleaning the TB and the IAC it did help for a few days but now back to how it was. also when coming to a hard stop it feels as tho the engine wants to sall. it seems als tho the RPMs are dropping low but TAC on dash doesnt show RPMs dropping. im clueless at this point.


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If you are low on trans fluid your torque converter is trying to stay in lockup mode.