1990 Toyota Pickup High Idle

1990 TOYOTA PICKUP
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GOLDBERG1818
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  • 2 POSTS
i have a 1990 toyota pickup 4x4 6cyl engine. when i start the truck up it idles around 2K RPM. sometimes i can hit the gas and and the idle will drop back down to around 1K RPM. its almost as if the throttle body gets stuck. When it does go back to 1k RPM the gas cuts off and rpms drop to 500RPM and then the gas kicks back on and jumps up to 1200 RPM. Most of the time though its around 2K rpm. Does anyone have a clue what the problem is?

I think if i adjust the idle then thats just going to mask the problem and not solve it.

thanks to anyone who reads this and suggests a solution.
Dec 12, 2006 at 2:49 AM
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RASMATAZ
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  • 75,988 POSTS
Clean the throttle body-inspect and test the iacv/tps.
Dec 12, 2006 at 5:56 AM
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GOLDBERG1818
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how do i test the tbs and the iacv? thanks for your help.
Dec 14, 2006 at 5:10 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Try cleaning the throttle body and idle air contol valve before testing the IACV and throttle position sensor,and see what happens.

Good Luck!
Dec 14, 2006 at 6:34 AM

Suggested Repair

Clean the throttle body and idle air control valve first. If the high idle continues, inspect and test the IACV and throttle position sensor.

Conversation Summary

A 1990 Toyota Pickup 4x4 with a 6-cylinder engine idles around 2000 RPM after startup and sometimes drops after the throttle is blipped, as if the throttle body is sticking. It can also hunt between about 500 and 1200 RPM. The expert advised cleaning the throttle body and idle air control valve before testing the IACV and throttle position sensor.

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