Vibration at stop from AC

[wreedps]

Hello,

I have a pretty bad vibration that I believe is from the AC compressor when I am stopped at a light. If I roll a little bit it goes away but them comes back when I am sitting.

Is there anything that can be done short of replacing compressor?

The pulleys and belts are all new.

 

[justinlw]

When's the last time you've cleaned the throttle body? Changed plugs? The vibration is probably from the engine, the AC is just putting enough load on it to cause the vibration.

 

[wreedps]

I sprayed the throttle body down around 5000 miles ago.

I need to change the plugs. I have them in my garage. I just havent got around to it yet.

When I turn the AC off the vibration goes away.

 

[Goodinblack]

Fault in engine performance. Not ac like stated above

NBS trucks even new had a slight vibration when ac came on

 

[wreedps]

So what do you recommend? Changing the plugs first? Truck runs great otherwise!

 

[Goodinblack]

Check the IAC too

 

[justinlw]

What year is your truck? The later IAC isn't serviceable. All you can do is scrub the throttle body, and spray in the iac air port. I would clean the MAF as well, most people neglect the maf, and it can cause all kinda of efficiency and running issues.

 

[wreedps]

It is a 2005. The IAC must not be serviceable because I do not see it for sale on rockauto.

When it goes bad, how do you replace it?

 

[justinlw]

It comes as an assembly with throttle body. It's riveted on, combined with the tps and throttle motor.

 

[GangstaCowboy]

Sorry to highjack this but I have been chasing vibrations as well when the AC comes on. How much play should be in the idle pulley for the AC belt? I checked mine last night and it has some wiggle from side to side, but not too much.