Thread: changed thermostat and now shifting weird

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  1. #1 changed thermostat and now shifting weird 
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    Can an engine thermostat have anything to do with the tranny shifting? Seems to want to hold second gear a long time before shifting since I changed the thermostat. I have an engine code too but haven't had the chance to get someone to read it.
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  2. #2 Re: changed thermostat and now shifting weird 
    Killa Bee Scottydoggs's Avatar
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    not likely, get the car scanned for that code. it will lead you to the problem.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  3. #3 Re: changed thermostat and now shifting weird 
    GrandPrix Junkie HighOctaneRacing's Avatar
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    When you changed the stat, did you unplug the TPS, MAF, or IAC? if, so did you forget to plug them back in?
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  4. #4 Re: changed thermostat and now shifting weird 
    Donating Users timboku's Avatar
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    Did you unplug or fray the coolant temp.wire that goes over one.of the thermostat housing nuts? Not sure.that would cause shifting.issues though.

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