indy rpm's too high.

APACHE 64D · Post by **APACHE 64D** » Mon Mar 31, 2008 7:26 pm

Well, i have a problem (if you can call it that) with my indy. My lady cracked it up and told me that the rpm's are too high at 3,000 and it won't come down even after sitting for a while. She says the car drive just fine and even the tranny shifts perfect. What could be causing the rpms to be so high with the engine functioning normal? I'm fly to Texas to drive the beast down to Miami and would appreciate any help with this issue. Thank you kindly.

clearfield18 · Post by **clearfield18** » Mon Mar 31, 2008 7:58 pm

look at all your vaccum hoses that would more likely be the problem.check all the ones right around the intake manifold and the ones right back by the firewall also there is one that runs down by the battery sorta underneath the car on the drivers side it hooks into some kind of canister I had to replace several of mine because they were doing the same thing yours are doing.over the years they tend to crack up and dry rot.also check your intake air temperature sensor its located right on the very back of the air box.you will have to take the air filter etc out to remove all that hold it in is a little clip just pop it out with a screwdriver.if your check engine light isnt on then its not any of the sensors if it is on it is more likely a sensor

Mr. Beefy · Post by **Mr. Beefy** » Mon Mar 31, 2008 8:42 pm

Your IAT sensor would have nothing to do with a high idle. You either have a vacuum leak or your TPS(throttle position sensor) is going. Is the check engine light on?

Take some carb cleaner and spray around your vacuum hoses in short bursts. If the car dies or acts like it's going to die the vacuum leak is there. Key spots: Throttle body(at the top where the 3 lines connect), inder the intake plentum, the line that t's off of the FPR, brake booster.

SuzukiGhostRider · Post by **SuzukiGhostRider** » Mon Mar 31, 2008 9:41 pm

What he said ^^ with one further FYI. A bad TPS will NOT always kick the SES (Service Engine Soon) light. I've seen them fail w/o kicking a code. GL , Sousa and Clearfield have you on the right track.

JeffD · Post by **JeffD** » Mon Mar 31, 2008 9:50 pm

A tps sensor on that car would have nothing to do with it. It's a self zeroing sensor, that is, the computer sees the at rest voltage output and tells itself that voltage equals 0% Tps.
check your vacuum lines to the MAP sensor, and the function of the MAP. if that line dry rots it will do what you are saying.

SuzukiGhostRider · Post by **SuzukiGhostRider** » Mon Mar 31, 2008 9:52 pm

(scberetta3800 @ Mar. 31 2008,19:50)QUOTEA tps sensor on that car would have nothing to do with it. It's a self zeroing sensor, that is, the computer sees the at rest voltage output and tells itself that voltage equals 0% Tps.
check your vacuum lines to the MAP sensor, and the function of the MAP. if that line dry rots it will do what you are saying.
Untrue. I've had TPS sensors cause 1500 RPM plus idles upon failure. Sure some were set wrong ,but others weren't. The MAP sensor is a good point too though.

JeffD · Post by **JeffD** » Mon Mar 31, 2008 11:34 pm

What were the cars that had problems? probably not your beretta. and it is true. if you take the GM tech1 to see what the ECM sees hold your foot on the gas half way, turn on the key and look at sensor data it will say TPS 0%. but you are right that they don't have to set the MIL light to be bad.
it just sounds like a vac leak to the MAP to me.

APACHE 64D · Post by **APACHE 64D** » Wed Apr 02, 2008 12:43 pm

Well, thank you guys for all your advices. I will check the vacuum lines when i get there Sat. No SES at all. The funny thing is the RPM's are set high but you can hear the engine run just fine. I hope it's a vacuum line thought easy fix.

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