car is revving up when started

25

Asked by Apr 28, 2008 at 08:49 PM about the 1997 Dodge Neon 2 Dr Sport Coupe

Question type: Maintenance & Repair

when we start the car it wants to stay at 3 grand. we just replaced the head because it went bad. it was sitting over a year before we put a head on it. we replaced the tps sensor but didnt fix it. so whats the problem(computer)!

6 Answers

85

there are 3 things that i can think of that would cause a high idle that are easy to spot... the first being a vacuum leak when you start the car listen under the hood for a hissing noise if their is no hissing then it's prolly not that. the second check the throttle body for obstructions make sure the butterfly valve is closing all the way if not try to adjust the idle screw. the third check around the intake manifold and make sure it's in good condition

8 out of 8 people think this is helpful.
145

check for vacuum leaks at the intake manifold. Did you change the manifold gaskets when you replaced the head? Dont ever touch the idle screw youll fuck up the throttle body. My 96 neon had the same problem and it was the intake gasket.

1 out of 1 people think this is helpful.
210

(NEVER MESS WITH THE FACTORY CALIBRATED IDLE SCREW) iT IS AN IMPOSSIBLLY HARD TO FIND REPLACEMENT THROTTLE BODY try your idle control stepper motor you will see it on the side of the throttle body get new gaskets when replacing

1 out of 1 people think this is helpful.
210

when replacing(I.A.C.) it will rev up when started with new idle air control stepper motor this will be when it recalibrates for the new part

2 out of 2 people think this is helpful.
40

how long does it take to reclibrate--we replaced our IAC and it is still idling fast

4 out of 4 people think this is helpful.
20

I have a 02 dodge neon what makes my throttle body clasp.

2 out of 2 people think this is helpful.

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