I have a 1998 Jeep wrangler. It started accelerating by itself. The rpm's go to 3 even when parked. I took it to Autozone and they put the machine but could not find anything wrong. Any idea why it's doing that?
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Do you have a "Check Engine" light? If not, check that the accelerator cable is functioning properly. When the accelerator is in the normal position the throttle plate should be completely closed. If necessary you should remove the air duct to inspect the interior of the throttle body. The cable should be have no slack but should allow the throttle plate to close all the way.
If the throttle is working properly then I would suggest looking at the idle air control (IAC) valve which controls the idle speed when the car is in park, in neutral or in gear and the accelerator is not depressed. Try disconnecting the IAC and note how the idle is affected. This will cause a Check Engine light to turn on. To clear it, disconnect the negative battery cable for 5 minutes then start the car. Let me know what you find out.
1. Set parking brake. Shift automatic transmission to Park or manual transmission to Neutral. With A/C off, start engine and attain normal operating temperature.
2. With ignition OFF, connect an ignition timing light and a calibrated, expanded-scale tachometer.
3. Disconnect 4 " and 10 " Hg (CEC System) vacuum switch assembly wire connector (located at top of valve cover). Disconnect and plug distributor vacuum advance hose.
4. Start engine, increase engine speed to 1600 RPM and check ignition timing. Adjust timing to specification listed on Emission Control Information label (if necessary). Tighten distributor hold-down clamp and recheck ignition timing.
5. Turn engine off and remove timing light and tachometer. Connect No. 1 spark plug lead, if disconnected. Unplug and connect distributor vacuum advance hose. Connect vacuum switch assembly wire connector.
NOTE: If timing light has an adjustable advance control feature, turn control to OFF position.
Could be one of several items...I'd check the fuel pump relay, auto shutdown relay and the ignition switch itself. I'd bet on it being one of those relays but, we all have been fooled at least once!!! I'd also make sure that body and engine grounding is good and clean. Relays can't work properly without a good ground.
I have a 97 TJ and the headlights wouldn't come on but the parking lights would. Funny thing was that if I pulled the brights to flash someone, the brights would work. I took out the old headlight switch ($26 at Checker) and they work again. When I pulled the switch there was one connector that seemed to be corroded. Hope this helps
If you ever have an oil leak it really should be fixed right away unless this happened all at once. Go to a local mech or if there is an Autozone around go there and have them check the Engine Light code for you for free. You will have more info to work with.