Extremely high idle

Extremely high idle

Postby stayparanoid [OP] » October 4th 2017, 9:55pm

So yesterday I changed my TPS because I've had the code for a while and had some free time. I've had surge problems and i assumed that this would do the trick to fix that. I drove the van earlier in the day and it was alright. I let it sit for about an hour, then I go ahead and disconnect the battery, take off the air filter, Throttle body hose, and disconnect the wiring. I had to move the wiring out of the way in order to get to the TPS because on the 94's it's in an infuriating spot. I get the old TPS off and it falls apart so i am really assuming its bad at this point. I put the new part on, snug up the screws, and i spray a little bit of throttle body cleaner in the TB and clean it while i've got all of these components off. I put all of the wiring back into their correct spots and button it all back together. I waited 30 minutes to let the excess throttle body cleaner dry up and connected the battery again. Started up the van and i immediately shut it off because it idling incredibly high. Probably somewhere in the 6000 RPM range.

The throttle body isn't stuck open and I am honestly at a loss of what could have happened here. I am no car expert, I just like to try to fix things myself.

Any ideas on what is going wrong here? I can't find any examples of this online for ANY vehicles.
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Re: Extremely high idle

Postby AstroWill » October 4th 2017, 10:14pm

Is your IAC valve working properly? Did you mess with it at all?

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Re: Extremely high idle

Postby stayparanoid [OP] » October 4th 2017, 11:13pm

I unplugged it to be able to reach the tps easier. But I didn't fidget with anything mechanically. Only thing I did do was manually push the lever the throttle cable is attached to so I could open the throttle body for cleaning. Not much more than that. It went back to the same position.
Original Poster [OP]
stayparanoid
Fueling (Empty tank)
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Years of Membership: stayparanoid has been a member for 3 full yearsstayparanoid has been a member for 3 full yearsstayparanoid has been a member for 3 full years
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Extra Info: 4.3L V6 RWD

Re: Extremely high idle

Postby stayparanoid [OP] » October 6th 2017, 11:03pm

Update for this: So apparently at some point when I was cleaning the throttle body the linkage to what i believe is the vacuum diaphragm got caught up. The hook was stuck in a weird position. Just enough to make it seem like the butterfly was shut properly. Jiggling it a little bit popped it back into place.

Total biff on my part. Should have been more observant.

Running like a beaut now with the new TPS.
Original Poster [OP]
stayparanoid
Fueling (Empty tank)
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Alias (AKA): Michael
Van Model Year: 1994
Van Make/Model: GMC Safari
Extra Info: 4.3L V6 RWD

Re: Extremely high idle

Postby Big_kid » October 7th 2017, 12:01am

Thanks for the update!
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