Question about 1999 Jeep Grand Cherokee
The only way an engine can run Wide open is if the throttle plate is opened all the way, allowing a large volume of air in to the engine. Check the throttle plate and see if it is hung up or possibly the throttle cable is frayed and holding the throttle open. It is not the injectors, they operate on inputs from the PCM.
Posted on Nov 13, 2010
When looking in top of throttle body the flapper is closed till you push pedal down then it opens up . Is this what you mean by throttle plate
Yes. And when the engine is running, is the plate closed?
Also when checked the TPS it had sum rust on it where slides onto shaft. Cleaned it good an re-assembled an also cleaned throttle body bore good so plate couldnt hang on anything
With the engine off, operate the throttle plate with the lever linkage on the engine and also push on the throttle plate to see if it is loose.
have manualy operated it with all the linkages on , Its closed when not running I grad the arm with the throttle linkage on it an open it up an when let go it springs back fully closed an cant feel any slack in plate itself
Ok, so the engine is idling high...but not at full throttle, right?
So with the problem of the battery draining when left connected couldnt be something shorting out an causing it to drain an run wide open
Now I'm confused......Ok, so the engine is idling high...but not at full throttle? What rpm is the engine getting to?
no sir when you start it without touching throttle it sputers couple times then goes wide open all at once .so i shut it down fast a possible.When it does you can hit the pedal real fast an it makes no difference .still throttles wide open . An im talking wide open
You replaced the throttle position sensor? If so, why?
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not sure it throttles up so high speed .i shut it right back off .afraid of something happening
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