TBI problem - no high idle - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**ScottH** · 07-30-2012, 01:33 PM

I have a 87 R10 with a 305 TBI engine that has about 130k on it. When I got it the idle would stay high and it ran kinda rich. After searching on the board I replaced the CTS and thermostat. That solved the high idle problem, however since then I've noticed it does not have a high idle when cold. Also noticed that when I put the AC on there is no increase in engine speed (AC not working correctly yet, cycles on/off). Also just replaced both injectors with no change. It does run fine at idle, just no cold high idle.

Was thinking of replacing the IAC but wanted to get some opinions first.

Any suggestions or info is appreciated.

Thanks
Scott

07-30-2012, 01:33 PM	#1
ScottH Senior Member Join Date: Sep 2002 Location: Hampstead, NC Posts: 8,190	TBI problem - no high idle I have a 87 R10 with a 305 TBI engine that has about 130k on it. When I got it the idle would stay high and it ran kinda rich. After searching on the board I replaced the CTS and thermostat. That solved the high idle problem, however since then I've noticed it does not have a high idle when cold. Also noticed that when I put the AC on there is no increase in engine speed (AC not working correctly yet, cycles on/off). Also just replaced both injectors with no change. It does run fine at idle, just no cold high idle. Was thinking of replacing the IAC but wanted to get some opinions first. Any suggestions or info is appreciated. Thanks Scott __________________ 1963 C10 swb fleetside 1966 GMC G1000 Handi-bus (future project) 1955 Chevy 2 dr. wagon



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.