alemmons

iTrader: (14)

I have an 89 GXL converted T2. Street Ported, open intake, 3" exhaust. Every once in a while I get an idle bouncing and I cant figure out why. TPS seems good, but maybe... When the idle starts bouncing usually it will fix if I turn on the electric fan. Seems weird, but does anybody have ideas what would cause this?

satch

iTrader: (1)

Could be the BAC adjusting for load when the fan is turned on.

SirCygnus

iTrader: (1)

vac leak.

alemmons

iTrader: (14)

I have tried tracking down any vacuum leaks. Doesn't seem to be any, but since this is sporadic, maybe there is one that just occasionally leaks.

satch

iTrader: (1)

When does the idle bounce. Warm engine? Cold engine? Braking only? Car not in gear?

zoomy942

iTrader: (2)

mine only bounces cold. stupid thing. lol and i checked for vac leaks too. nada.

satch

iTrader: (1)

Sometimes a dirty throttle body will cause this among other possibilities.

driftxsequence

iTrader: (8)

my car has a lumpy idle due to running super rich at idle and it likes to oscillate. when i turn on the a/c or fan it tends to steady the idle out, especially the AC.

zoomy942

iTrader: (2)

not to thread hijack - but how do I clean a TB?

alemmons

iTrader: (14)

Idle is always a little lumpy, but I figure that is due to the street port. The engine is usually warm when I get the bouncing idle. The TB has been cleaned when I had the engine apart for a rebuild. Most of the emissions have been removed, still have the BAC.