fast idle

[67bbc]

ok, ichecked my vaccum lines and they seem to be alright, but it still idles around 1700 rpms. Any ideas? :-? [addsig]

[west747]

there should be an idle adjustment srew on your carb.[addsig]

[[]lllllll[]]

I have read in the jeep chilton's book that the idle on the 91 2.5 is completely computer controled, altough there is a screw on the throttle body. Check your wiring and make sure your computer is not screwing up. I have the same problem, but with the idle being too low. Good luck,

James[addsig]

[west747]

hehe,,,i guess we need to know some more info on his/her rig before determining an answer [addsig]

[jterp]

Carb or FI?[addsig]

[67bbc]

Oops! My bad! It is a 91 YJ 2.5l 5-speed. TPS was changed, no luck.[addsig]

	Throttle position sensor A throttle position sensor (TPS) is a sensor used to monitor the position of the throttle in an internal combustion engine. The sensor is usually located on the butterfly spindle so that it can directly monitor the position of the butterfly throttle valve. The sensor is usually a potentiometer and therefore provides a variable resistance dependent upon the position of the butterfly valve (and hence throttle position). The sensor signal is used by the Engine Control Unit (ECU) as an input to its control system. The ignition timing and fuel injection timing (and potentially other parameters) are altered depending upon the position of the throttle, and also depending on the rate of change of that position. For example, in fuel injected engines, in order to avoid stalling, extra fuel may be injected if the throttle is opened rapidly (mimicking the accelerator pump of carburetor systems).