Question about 1992 Toyota Corolla

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1992 Toyota Corolla engine speed surges at idle ONLY after long distance drive

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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  • Chris Jan 02, 2013

    Addition to my surging question. My engine is 4A-FE Fuel Injected, 1600cc

  • Chris Jan 02, 2013

    Yes, the throttle body is clean. I sprayed it with carb cleaner recently, and clean it regularly.

  • Chris Jan 02, 2013

    I spoke with a Totota mechanic. He said increased RPM's upon removing TPS cable is normal. He said 50% chance it's TPS. He said he's never heard of this problem before. One other detail to ad. Only noticed this happen once. Shortly after surging happened, car turned off, both internal dome lights were flickering a little when turned on. Never seen this happen before. Then and few minutes later, they stabilized. I think RPM's had probably stabilized by then also. Seems like surging "may" have been transferring elsewhere throughout system. Never noticed lights flickering before, and didn't happen again, even when surging problems still existed.

  • Chris Jan 04, 2013

    Any suggestions would be appreciated. Thanks.

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GARYca
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SOURCE: No spark, 1988 Toyota Camry 3SFE 4cyl, 5 speed.

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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SOURCE: I HAVE A TOYOTA TERCEL THAT SURGES AT AN IDLE, I

Try replacing that sensor or continue looking for a vacume leak

Posted on Sep 09, 2009

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