Question about 1989 Toyota Pickup SR5

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89 Toyota pickup erratic idle when warmed up

My 89 toyota pickup has a loping idle after it warms up. i have no check engine lights on and when i step on the brakes it slows the pace of the loping idle. Vaccumm line from the brake booster was my first guess i check it out but it seems fine. any one got a clue? and i bought a new tps sensor but i dont want to put it on if i don't have to.

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  • hleppy Dec 30, 2008

    there are no cracks or leaks any where from air filter to the throttle body

  • blt_f_250 Dec 31, 2008

    revs up and down when in idle and does it more when brakes applied

  • dicksmac Jan 30, 2009

    I have the exact same problem and seems tp be getting worse,  Check engine light came on and has stayed on. 
    Ideas????

  • Toyota Ed May 11, 2010

    Look for cracks/leaks in the tube from the air flow meter to the intake manifold.

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I had the same problem and found the idle screw was hitting a small shock absorber that had worn out and wasn't allowing the rocker arm to release all the way. Now i just need to find a replacement part for this 20 yr old truck, right.

Posted on Apr 23, 2009

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Its a vacumm guys check all your hoses with a carb cleaner while engine on be carefull not to let it catch on fire with the spray ok give it a slight of puff of it with the spray ok!! remember truck hoses are old and cracking ..

Posted on Mar 07, 2009

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