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Sticky throttle


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I know on my last truck (98 Ford F150), my throttle was sticking. It'd take a bit to move the accelerator, and once it "un-stuck", it was fine. I figured out the problem was that Ford directs the burned exhaust through a hose back into the throttle body. All that did for it was put a bunch of sticky carbon buildup in there, and cause the butterfly to stick after it had sit for a few hours. After taking off the throttle body and cleaning it good with Berrymans, it never stuck again, and seemed to pick up some pep. Good design there, ford :P

 

I'm wondering if the same thing is true with the GM motors. Do they pass some of the exhaust gas back through the throttle body too?

 

If not, what are some of the possibilities of what's causing it to stick then release suddenly from a standstill after it's set?

 

I know it's not a drive by wire from the cab to the engine; I can trace the physical throttle cable up to the cowling covering the intake; just haven't taken off that covering yet.

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On my last GMC which was a 2000 2500 Ext Cab 4x4 with the 6.0 I developed the same problem. Took it to the local dealer who showed me the service bulletin on it. There was a hole in the plate inside my throttlebody that needed to be plugged with a rubber plunger. The throttlebody had to be removed first and cleaned with throttle body cleaner spray. After I bought the plug(Pocket change), cleaned the throttle body, and inserted the plug, I took it back to the dealership and the mechanic recalibrated something and problem was fixed. Not sure what year trucks would be affected. I would say go to a dealership that you trust and ask to see the service bulletin. Mine was done at no charge but pulling and cleaning the throttlebody was kind of a pain. Good Luck! :P

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Just cleaned the throttle body and butterfly; man, was it nasty. Sad that they feel the need to run dirty exhaust through a system that they spend so much time trying to keep clean...

 

But, no more sticky throttle.

 

I was going to get the plug, but, the dealer here told me the plug was free, but, it was going to cost to have it hooked up to the computer to have it re-adjusted.

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Just cleaned the throttle body and butterfly; man, was it nasty.  Sad that they feel the need to run dirty exhaust through a system that they spend so much time trying to keep clean...

 

But, no more sticky throttle.

 

I was going to get the plug, but, the dealer here told me the plug was free, but, it was going to cost to have it hooked up to the computer to have it re-adjusted.

 

 

 

 

Change your PCV valve if you dont have the orificed type valve. Trust me, it helps. PCV system on these engines suck.

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What the plug does is block of the idle air passage so that the throttle plate can be cranked open a few more degress without jacking up the idle speed. Doing that give the throttle plate just a little more clearance from the bore so that it's less likely to stick again. They wanted to charge you to adjust the throttle stop screw for base idle speed (without the computer making constant adjustments).

 

Vernon

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