Runs The Same With TPS Unplugged - Engine Troubleshooting


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Runs The Same With TPS Unplugged

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Auto Repair Home>> Automotive Repair>> Engine Troubleshooting

cleverlion
Novice

Apr 21, 2013, 1:07 PM

Post #1 of 4 (2130 views)

Runs The Same With TPS Unplugged	Sign In

95 4Runner 3.0

Having sporadic idle - 900 1 minute & 1100 the next - with NO power off the line until 15 MPH, I've cleaned injectors, found no vacuum leaks & installed new plugs. Still runs the same, so my next thought is the Throttle Position Sensor. SOooooo, I unplugged the TPS and engine runs the exact same. More ideas anyone ???

Thanks for your time & Feedback.

Michael

MarineGrunt
Enthusiast
MarineGrunt profile image

Apr 21, 2013, 1:51 PM

Post #2 of 4 (2107 views)

Re: Runs The Same With TPS Unplugged	Sign In

I'm not positive on this but I don't think the tps really affects idle. Maybe clean the throttle body and see if that helps. Have you checked the iac?

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Apr 21, 2013, 1:57 PM

Post #3 of 4 (2102 views)

Re: Runs The Same With TPS Unplugged	Sign In

Your test doesn't prove much of anything. The only thing it accomplishes is to set another code.

You may have a bad IAC ( idle air control) but try eliminating any vacuum leaks and cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.

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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Apr 23, 2013, 5:53 PM

Post #4 of 4 (2042 views)

Re: Runs The Same With TPS Unplugged	Sign In

Check for trouble codes stored in the engine ECU?

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

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