TPS - is this normal?
08-06-2007, 07:27 PM
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TPS - is this normal?
When re-setting the tps I can't get a constant reading at closed throttle.
Set tps to .540, Open throttle and get 4.2, close throttle and get .538, open and close again and get .547, and again to get .540. etc. Each time will get a different reading at closed position.
Is this normal to fluctuate that much and will that cause idle issues?
Set tps to .540, Open throttle and get 4.2, close throttle and get .538, open and close again and get .547, and again to get .540. etc. Each time will get a different reading at closed position.
Is this normal to fluctuate that much and will that cause idle issues?
08-06-2007, 08:09 PM
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Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: TPS - is this normal?
Sounds fine to me. That 3rd digit to the right of the decimal point is WAY down into the noise. You don't need that much precision. The 2nd digit can vary by a couple and it not cause a problem; let alone the 3rd one.
"Measure with micrometer, mark with chalk, cut with axe"
"Measure with micrometer, mark with chalk, cut with axe"
08-07-2007, 06:36 AM
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Re: TPS - is this normal?
I checked with two different meters, same responce. Would this fluctation at close throttle effect the way the ecm signals the IAC? When the rough idle starts to happen, if the car doesn't stall, after 10 to 15 seconds the idle will pick up to around 750/800 and then flucuate from there back down to 500. It will do this untill you either shut down or take off down the road. Off idle it runs great.
08-07-2007, 07:08 AM
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Car: 1987 SC/1985 TA
Engine: 350/vortec/fitech
Transmission: T56
Axle/Gears: 3.27 9-bolt
Re: TPS - is this normal?
As Sofakingdom said that slight variation in voltage will not cause a problem. Your problems are more likely caused by a bad or dirty IAC, I'd check that next.
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