throttle sticks intermittently...

[raroZ28]

Just like the topic says. Sometimes It'll stick, sometimes it won't.

The weird thing is, if I start it up, and drive, and it doesn't stick right away, it won't stick at all, no matter how long I drive. Once I shut the car down, I'll start it back up and it'll stick, and it'll stick the whole time I drive. I have to tap the gas pedal to make it come back up, so I'm thinking it's electrical, and not so much a mechanical stick.

It's a 97 z28, any idea what's up?

[Kevin - Blown 95 TA]

It's usually a mechanical reason. Take the plastic TB cover off and see if that helps. Mine used to rub from time to time. Also, to simplify the troubleshooting, you could unsnap the cruise control cable from the bellcrank to rule that out. You also might unhook the throttle cable and see how the cable feels in the housing and whether it moved freely like when new. Drive around and if it sticks (assuming it is sticking at a high idle) park the car with emergency brake on, open the hood, and see if it is sticking open for some reason - see if something is interfering with the bellcrank. You might also need to take off the throttle body intake bellows and see that it isn't too carboned up in there. the idle circuit can often get too carboned up & not work properly.

Now, if it isn't mechanical, then look for a vacuum leak, undone hose, loose or non-functioning PCV valve, bad intake gasket, or other engine control that might be causing the engine to lose control of the idle speed. let us know what you find.

[wako29]

also, if it sticks at all when you go to rev it, then I would suggest taking off the air filter boot so you have direct access to the TB. The blades get like this carbon residue on the tips of the blades, and just take some rubbing alcohol or something and put it on the edge of a Q-tip and clean off the blades and the TB where the blades touch. Its something that I do regularly to all of our newer cars. I even just had to do it on my mom's MPV minivan.