My SRT is driving me crazy. Pls help!

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black03rt
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My SRT is driving me crazy. Pls help!

Post by black03rt » Wed Oct 03, 2012 7:34 pm

So I finally finished my timing belt nightmare. The car now needs a radiator but I took it for a small drive last night to be sure that's all it needs.

Long story short. I gave it gas and had no boost. Then I tried again and all of a sudden it revved to 6k and wouldn't not stop so I shut the car off and coasted home. Everything appears to be connected so any ideas what I'm missing?

Ps. It had a new timing belt, water pump, tensioner, intake gasket, and a 2.0 cam installed if that helps give an idea of what all was taken apart.

Thank you!
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Johny
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Post by Johny » Thu Oct 04, 2012 4:24 pm

Hmm, have you checked for vaac leaks? Was the intake gasket properly seated and bolted on right? That could cause major leaks..

I know when I tried it without a gasket on my 2.0 just to see what it would do, it rev'd like crazy.
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black03rt
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Post by black03rt » Thu Oct 04, 2012 6:06 pm

Thanks for your answer. I'm going to try the intake gasket first. I found it a bit weird that it drove just fine (minus boost) and then all of a sudden the reving.
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Post by boostalot717 » Thu Oct 04, 2012 8:58 pm

If its revving to the moon by itself its getting air somewhere. Check the vac line on the back side of the plenum since you were messing with intake it might be off.

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Post by black03rt » Thu Oct 04, 2012 9:21 pm

Would a vacuum leak cause lack of boost as well?
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Post by titansxt » Fri Oct 05, 2012 1:48 am

Wiggle the TPS wires just for fun?
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Post by NGCnoproblem » Fri Oct 05, 2012 10:39 am

That would b a huge boost leak if its your intake gasket and I would think that would keep you from gettin much if any boost. All that pressure is escaping through the leak instead of goin in the engine
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Post by boostalot717 » Fri Oct 05, 2012 11:35 am

black03rt wrote:Would a vacuum leak cause lack of boost as well?
yeppers remember that hose sees both vac and psi

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Post by He Hate Me » Sun Oct 28, 2012 6:27 pm

Before you start buying things and thinking of where it is, buy or make a boost leak tester. It will save you money and a lot of headaches.
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Post by nschultz0124 » Sat Nov 24, 2012 1:55 pm

Did you ever figure it out? My car did something similar when i blew the brake booster vacuum line off....all of the sudden no brakes, the car ran like crap, and high revs....
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Post by sidepipe87 » Sat Nov 24, 2012 2:01 pm

Yes... it's a vacuum leak somewhere.
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Post by theColonel » Sat Nov 24, 2012 2:56 pm

Why would a vacuum leak result in high revs ?
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Post by occasional demons » Sat Nov 24, 2012 8:45 pm

Because a vacuum leak is the same as opening the throttle body. It is not the same as carburetted set up.

The only thing lacking is a proper TPS signal. The extra air means extra fuel, because the MAP and o2 sensor are telling the PCM the manifold vacuum is low, and the o2 says it is lean. So the PCM dumps more fuel to correct the problem. Thus it will rev as high as the air volume, or rev limiter will allow.


When My AIC solenoid stuck open, it easily revved to 4000 rpm with the throttle closed. It doesn't take a big hole.
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Post by Jenni » Sun Nov 25, 2012 12:09 am

tps or idle air control valve - so check everything at the throttle body!

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Post by theColonel » Sun Nov 25, 2012 8:38 am

occasional demons wrote:Because a vacuum leak is the same as opening the throttle body. It is not the same as carburetted set up.

The only thing lacking is a proper TPS signal. The extra air means extra fuel, because the MAP and o2 sensor are telling the PCM the manifold vacuum is low, and the o2 says it is lean.
So the PCM dumps more fuel to correct the problem. Thus it will rev as high as the air volume, or rev limiter will allow.

When My AIC solenoid stuck open, it easily revved to 4000 rpm with the throttle closed. It doesn't take a big hole.
Thanks for the explanation ... I guess I'll always think in terms of carburetors :banghead:
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