This thing just won't idle

MDGaumond · 12-21-2004, 08:23 PM

I am hoping that someone out there can help me. I have a 1986 vert with a new mild mod TPI engine with auto trans. I put the top down Saturday and took a ride through the canyons. It ran great and I loved it, purred like a kitten. I got up Sunday and it wouldn't idle. If I hold the gas pedal down a bit it will idle (700 RPM) but when I let go it stalls immediately. I can't figure out what's going on. I haven't changed anything rom Saturday, heck it's even the same tank of gas. Does anyone have any ideas? Is there an idle adjustment screw or something? I can't find one. Please help.
Thanks and Merry Christmas to everyone!

ol,RJ · 12-22-2004, 02:32 AM

its probably just time to clean the throttle body (kinda a maintainance thing).
just remove the intake hose, hold the throttle open, and wipe behind the throttle with a rag soaked with carb cleaner.
the carbon build up back there can effect idle quality.

If that doesn't help then you may have a sticking IAC valve.

MDGaumond · 12-22-2004, 12:45 PM

gbody5 · 12-22-2004, 01:00 PM

Be sure to use Throttle Body cleaner, safe for coated surfaces, some carb cleaners will eat away the finish.

REDC4CORVETTE · 12-28-2004, 06:23 AM

Do not touch the idle screw.I would check the EGR valve or check codes to see if you have a 34.
It was ok the night before. Also check the vaccum line at the back of
the distributor it's a 3 way vac bulb.
Check the gas cap see if it is on tight.