Question about 1995 Isuzu Trooper

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1995 Trooper: Sometimes when I go to stop the brake doesn't and the engine revs up and lunges forward. this has only happened twice in the last year. what do you think?

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A few things come to mind here.... i know that this is a very uncomfortable situation to be in sort of like playing Russian roulette while driving as you don't know when the next event will happen and how it will affect you and others, so here is what i would do:
First static test the accerleration pedal cable snapping it open and closed(have a partner in the car pushing the gas pedal down and releasing it while you are obsrving the action) Be sure the car is turned off !!
While observing look for anything that may be the cause of the gas linkage "sticking" in a fast idle position and not allowing it to come to a normal rest position, spray pretty heavily the whole mechanismn that has anything to do with the gas pedal movement using WD 40, this is great stuff even good for rubber and electrical preservation!!
Also have someone scan the computer for a possible code leading you to find a possible sensor that may be defunct causing this.
Try a good product of fuel injector cleaner and perhaps a tank of high test to try to cleanse the interior of the fuel supply an area that you can't see such as the IAC motor which has a lot to do with the idle and can and does go bad, also a possible TPS code(Throttle Positioning Sensor).... however a computer scan "should" detect this. Auto Zone/Discount Auto, etc. does these scans and gives you a print out of whats possibly wrong all for free!!
Be certain also that the cruise control device is not left on and possibly causing the erratic idling at times. Spray with WD 40 also around the servo etc to clear possible grease jamming controls.
If you can't detect anything then I would suggest taking the vehicle in to a reputable shop and have them test it out allow them at least 1 hour diagnostic time and see what they come up with it sounds a bit risky to let this problem slip away.
I hope this helps

Posted on Aug 06, 2010

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