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jml32788
11-13-2007, 03:19 PM
I have a 98 4x4 manual ranger, It has a few problems with it. Whenever i turn the heat on the rpms jump up to 2500rpm... Can anyone help me with that?

Also whenever it rains, i flick on my lights and the left turn signal comes on and stays on (doesnt blink). And even when the truck is off and the lights arnt on when i hit the break the parking lights come on and the headlights come on very dimmly. I know its a short circuit somewhere but i dont know where to look.
Bob Ayers
11-13-2007, 04:54 PM
The RPMs going up when you turn your heat on is due to the AC compressor coming on, and the PCM opens up the IAC valve to compensate for the additional load.

Check the ground connections on your back left brake/running light. It's a dual filament bulb, and without the ground, current is flowing from the brake circuit into the lights circuit.
jml32788
11-13-2007, 05:15 PM
Thank for the help, but im still confused on the RPM thing. why would it jump up to 2500 rpm. Do i have a stuck IAC valve? or a cloged vacum tube? any thing u can suggest i check?
Bob Ayers
11-13-2007, 05:18 PM
The IAC could have a problem, 2500 RPMs is way high. Has it thrown a CEL?
jml32788
11-13-2007, 05:32 PM
Im not sure what a CEL is, but everything still runs and works fine, theres no weird smell coming from the vents, gas mileage is still fine, its just when i push in the clutch the rpms get stuck at 2500-3000. sometimes when i come to a complete stop it will drop back down to idle. But only sometimes
Bob Ayers
11-13-2007, 05:35 PM
Im not sure what a CEL is, but everything still runs and works fine, theres no weird smell coming from the vents, gas mileage is still fine, its just when i push in the clutch the rpms get stuck at 2500-3000. sometimes when i come to a complete stop it will drop back down to idle. But only sometimes

I'm sorry, a CEL is a Check Engine Light.
jml32788
11-13-2007, 05:47 PM
No, theres no lights on
sonicboom919
11-14-2007, 10:21 PM
I have the same problem when the air conditioner is on...i have read on other forums that the problem is a gunked up IAC, and that you need to give it a cleaning and all that crap to help the problem. I havent seen any people put this problem on forums until about 3 weeks ago, and now it's all over the place...on all different year rangers...hmm