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Old 02-20-2010, 05:20 PM   #1 (permalink)
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4 Runner won't idle sometimes

My wife's 1987 4Runner has a problem. After driving it approx. 10 miles, it doesn't want to idle. The rest of the time it runs and idles just fine. Only after you drive it 15 minutes or so. Once it starts acting up, if you stop and just keep it running for a minute or 2, the problem goes away. Drive it a few miles, the problem comes back.

Here's what I have done:
Changed plugs and wires
Changed fuel filter
Checked fuel pressure (between 32-42psi even when it won't idle)
Changed temp sender that didn't ohm out (the one next to the cold start sensor)

It doesn't have any fault codes, it runs fine other than intermitant ideling problem.

Any suggestions????
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Old 02-20-2010, 05:50 PM   #2 (permalink)
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02sensor or tps

Last edited by dirty530; 02-20-2010 at 05:58 PM.
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Old 02-21-2010, 04:51 PM   #3 (permalink)
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I would think either one of these would throw a fault code.
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Old 02-21-2010, 05:36 PM   #4 (permalink)
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tps

negative ghostrider. never had any o2 sensor problems, but my tps crapped out and never threw a code. ran about like yours but no codes. good luck.
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Old 02-21-2010, 05:53 PM   #5 (permalink)
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Try swaping the ecu? See what it does?
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Old 02-23-2010, 02:59 PM   #6 (permalink)
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i had a similar problem because my throttle had accumulated too much carbon/gunk. try a $5 can of throttle body/carb cleaner. remove air intake from throttle body, spray inside and move accellerator to open/close and work out the gunk, also spray spring outside until it moves freely.
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Old 02-23-2010, 10:19 PM   #7 (permalink)
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Check the TPS. Most likely culprit. Roger Brown's Write up is the best guide. They don't always toss a code when it's an intermittent issue.
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Last edited by steveh; 02-23-2010 at 10:21 PM.
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