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85 GSL 12A Throttle Position Sensor Problem?

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Old 11-27-07, 03:29 PM
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85 GSL 12A Throttle Position Sensor Problem?

My 85 GSL 12A runs bad. My mechanic buddy says I need a Throttle Position Sensor (TPS). The car has difficulty in reaching 60 MPH. The idle is terrible. I have installed new spark plugs, spark plug wires and air filter. The car has very little power. My mechanic buddy checked the timing and suggested replacing the TPS. I think the carburator is a stock Nikki. I look for vaccum leaks and could not find any. The car is all warm up when this poor performance is experienced.
Old 11-27-07, 03:30 PM
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Find a new mechanic
Old 11-27-07, 03:51 PM
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Preferably one who's had actual experience working on rotaries.
Old 11-27-07, 03:51 PM
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Originally Posted by wackyracer
Find a new mechanic
I agree, last time I checked there wasn't a TPS on a carbed motor
Old 11-27-07, 05:19 PM
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I thought this was the throttle sensor on the nikki.
Did you just get the car? Probably needs the carb to be rebuilt if it looks anything like this one. If it's been sitting for a long time I bet the air bleeds are all cloged up.
Old 11-27-07, 05:33 PM
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there is a TPS i just dont know what exactly it does its like on off switch or something.

waysrx7 yes that is one
Old 11-27-07, 05:34 PM
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Originally Posted by DiamJim
My 85 GSL 12A runs bad. My mechanic buddy says I need a Throttle Position Sensor (TPS). The car has difficulty in reaching 60 MPH. The idle is terrible. I have installed new spark plugs, spark plug wires and air filter. The car has very little power. My mechanic buddy checked the timing and suggested replacing the TPS. I think the carburator is a stock Nikki. I look for vaccum leaks and could not find any. The car is all warm up when this poor performance is experienced.
believe it or not we had an really clean 81 come in, that needed a tps. the tps was intermittantly bad, and when it failed, it closed the shutter valve= 1 rotor = no power.

really really rare though, usually the shutter valve is bad...
Old 11-27-07, 05:34 PM
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Originally Posted by 3rd and final 7
there is a TPS i just dont know what exactly it does its like on off switch or something.

waysrx7 yes that is one
it runs the emissions system, air control valve, shutter valve, and the vacuum advances
Old 11-27-07, 11:17 PM
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check this out it saved me from giving up on my car http://www.mazdatrix.com/faq/shutter.htm, by the time I had found this link i had already rebuild the carb and had two shops abuse my car trying to figure it out, but found this to be the original problem once i got it back.
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