Question about 1992 Toyota Corolla
My idle speed surges up and down after driving long periods. Okay around town. Just took a long trip. Whenever I would pull over to fill gas, my idle speed would surge up and down at about 1200 - 2000 RPM and gradually increase even faster. No vacuum leaks. The car runs great otherwise. If I turn off engine, returns to normal after several minutes. Everything is fine on short distance drives, like 15 miles. When I apply the brake there is no difference, so it's not the brake booster. When surging, pulled off TPS (Throttle Position Sensor) wire, and speed stayed at very high RPM. Could TPS be problem? I removed TPS cover. At idle setting, bottom contact is engaged. As I turn throttle, as things rotate and move, I noticed that the top contact doesn't actually touch. It's a few thou away from actually making contact. The TPS looks new inside. Contacts show no signs of corrosion. Is my TPS bad? If yes, if I bend upper contact down so it'll touch, would this fix problem? Also, at very slow speeds, I noticed that "sometimes" I have difficulty driving slow. Speed wants to bounce up/down a bit, although everything else is great, and no engine surge. As I mentioned, car runs great otherwise. Last question. If it's TPS, can I replace it myself, or do I need a shop to adjust the angle perfectly? Thanks.
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Posted on Jan 02, 2017
there is no crank sensor on this vehicles 2.0L. If you have power to the coil, new coil, cap and rotor try this if not done yet>>>Unplug coil power first....Try pulling off the distributor cap, and make sure the rotor is spinning with the cam...If this fails to spin, inspect the entire distributor assembly. If it passes, Inspect all the power circuit and wiring to the dist assembly, if ok possible ecu. i recommend having a mechanic check it out!! Hopefully this helps...please rate...thanks
Posted on Aug 11, 2009
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