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 Replaced tps on 95' sc riviera idles high need help.

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SpecialRIV95'
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PostSubject: Replaced tps on 95' sc riviera idles high need help.   Wed Dec 09, 2015 11:04 am

Replaced a bad tps sensor now it idles real high I don't want to hurt the engine any suggestions?
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Abaddon
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PostSubject: Re: Replaced tps on 95' sc riviera idles high need help.   Wed Dec 09, 2015 11:17 am

First of all, welcome to the forum.

Are you sure you replaced the right part? Maybe the IAC is failing? Or they were both bad?
Did you buy an "adjustable" TPS with a slot in one opening that would allow you to clock the TPS wrong?
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PostSubject: Re: Replaced tps on 95' sc riviera idles high need help.   Wed Dec 09, 2015 11:20 am

Yes I had it scanned said po122 low. So replaced it and yes it has slot so sensor can be rotated
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PostSubject: Re: Replaced tps on 95' sc riviera idles high need help.   Wed Dec 09, 2015 11:24 am

Some one said try resetting PCM. So I un plugged positive cable and reattached a few mins later car seams to run better but still have high idle
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PostSubject: Re: Replaced tps on 95' sc riviera idles high need help.   Wed Dec 09, 2015 11:30 am

SpecialRIV95' wrote:
Yes I had it scanned said po122 low. So replaced it and yes it has slot so sensor can be rotated

With the car idling, loosen up the TPS screws and turn the sensor and see if you can bring the idle down.
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PostSubject: Re: Replaced tps on 95' sc riviera idles high need help.   Wed Dec 09, 2015 11:32 am

It has to be adjusted. The sensor tells the computer the throttle angle. The sensor gets a 5 volt reference signal from the computer, it sends back a voltage that corresponds to a throttle opening. .40 volts or so is closed throttle, 4.5 volts is wide open. A scan tool will read the TPS voltage. If you have no scan tool you can read the voltage with a multimeter. There are 3 wires, reference, ground and return voltage.

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98 Riviera SC3800  All stock except gutted air box.
1970 Buick GS455 Stage1, TSP built 470BBB, 602HP/589TQ
Best MPH, 116.06 MPH, Best ET, 11.54
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PostSubject: Re: Replaced tps on 95' sc riviera idles high need help.   Wed Dec 09, 2015 11:37 am

Ok I will adjust the sensor. And I will respond with results in a couple hours. Thanks everybody can't wait to have the full riviera exspericance
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PostSubject: Re: Replaced tps on 95' sc riviera idles high need help.   Wed Dec 09, 2015 12:39 pm

Ok at closer inspection the idler arm is not sitting on adjustable idler screw.
I took a pic but it's not letting me load it. Does cables need adjusting and to do so? Help I'm so close to having a solid sc riviera on the road.
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PostSubject: Re: Replaced tps on 95' sc riviera idles high need help.   Wed Dec 09, 2015 12:43 pm

And inspecting new tps I noticed it's not all the way tightened just a slight movement in sensor with physical force. Should I tighten the sensor all the way down, obviouse answer is yes. And will the slightly loose sensor throw idle off?
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PostSubject: Re: Replaced tps on 95' sc riviera idles high need help.   Wed Dec 09, 2015 2:08 pm

I would first try cleaning your throttle body before messing with your throttle cables if it is not returning all the way
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PostSubject: Re: Replaced tps on 95' sc riviera idles high need help.   Wed Dec 09, 2015 3:38 pm

I cleand the throttle body cause I had to take it of to replace the tps. Why they put screws their I have no ideal.
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PostSubject: Re: Replaced tps on 95' sc riviera idles high need help.   Wed Dec 09, 2015 4:51 pm

Ok question why would the idler arm sit back on the idler screw after replacing sensor
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PostSubject: Re: Replaced tps on 95' sc riviera idles high need help.   Wed Dec 09, 2015 5:48 pm

Idle speed is set by the computer with the idle air control (IAC). Not sure what screw you are referring to, but I would leave that alone. The computer must have a correct TPS reading so that the engine runs correctly. The TPS should not move around, tighten it down so it does not move.

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98 Riviera SC3800  All stock except gutted air box.
1970 Buick GS455 Stage1, TSP built 470BBB, 602HP/589TQ
Best MPH, 116.06 MPH, Best ET, 11.54
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PostSubject: Re: Replaced tps on 95' sc riviera idles high need help.   Thu Dec 10, 2015 10:59 am

I have a pic of it is their a way I can load it. And doubled check part and it's correct, theirs a adjustable screw on the back of the power steering pump right below the pump is the are that rest on the adjustable screw that sets the idle and the arm is not resting on the screw I have to pull linkage up to have it sit on screw and then care idles fine it's like a quarter in gap
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PostSubject: Re: Replaced tps on 95' sc riviera idles high need help.   Thu Dec 10, 2015 12:31 pm

SpecialRIV95' wrote:
I have a pic of it is their a way I can load it. And doubled check part and it's correct, theirs a adjustable screw on the back of the power steering pump right below the pump is the are that rest on the adjustable screw that sets the idle and the arm is not resting on the screw I have to pull linkage up to have it sit on screw and then care idles fine it's like a quarter in gap


From what I just gathered from this, is that your throttle cables are stretched out for some reason causing them to hold the throttle plate open? Did you have any "major" repairs done that would cause them to be routed the wrong way?
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PostSubject: Re: Replaced tps on 95' sc riviera idles high need help.   Thu Dec 10, 2015 4:39 pm

No just had to take throttle body off cause they put screws instead of bolts so in return I had to remove throttle body and cables are attached to it but didn't remove cables just did a 180 degree turn on throttle body with cables attached removed and replaced tps sensor and reinstalled throttle body
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PostSubject: Re: Replaced tps on 95' sc riviera idles high need help.   Thu Dec 10, 2015 4:59 pm

I'm take in to the Macanic in the morning all post his findings.
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PostSubject: Re: Replaced tps on 95' sc riviera idles high need help.   Thu Dec 10, 2015 5:26 pm

Sounds like you may have bent the throttle bracket or something.
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SpecialRIV95'
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PostSubject: Re: Replaced tps on 95' sc riviera idles high need help.   Fri Dec 11, 2015 7:35 pm

Nope Macanic said I didn't put the tps arm on the throttle arm so the tps wasn't even working. Hope this helps someone else
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