1994 ECM PCM INSTALL??
So I put a new ecm in my 94 sts and now the trans shifts hard. I put the stock ecm in the car and it shifts great. I put the PROM back in the new ecm and it shifts hard. anyone had this?
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RE: 1994 ECM PCM INSTALL??
Why are you replacing ecm? Transmission is controlled by ecm. Possibly bad or incorrect ecm.
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RE: 1994 ECM PCM INSTALL??
The ECM is a GM reman ECM. I replaced it due to an injecter not fireing. Now the motor runs good (with the new ECM) but the trans shifts hard. I put the stock ECM in and #6 injecter will not fire but the trans shifts great
thanks |
RE: 1994 ECM PCM INSTALL??
Still maybe bad ecm, after all they are rebuilt. Fuel injector driver will not be in the same part of ecm as trans controls.
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RE: 1994 ECM PCM INSTALL??
I was thinking the PROM was not holding the trans shift values.
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RE: 1994 ECM PCM INSTALL??
Prom won't lose calibration from ecm to ecm it is permently burn't in. GM prom's program can not be over written., It's not an E-prom which can be.
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RE: 1994 ECM PCM INSTALL??
so you think it is a bad reman ECM?
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RE: 1994 ECM PCM INSTALL??
ORIGINAL: rjs12182 so you think it is a bad reman ECM? ORIGINAL: slowroll Still maybe bad ecm, after all they are rebuilt. Fuel injector driver will not be in the same part of ecm as trans controls. |
RE: 1994 ECM PCM INSTALL??
I got a 2ed ECM from the junkyard they did an interchange and it is out of a 95 olds aurora. I put my prom in it from the stock ecm started the car. The car ran but has "no pcm data" I checked the prom it was in good.
So my stock ecm will not fire injector #6 but everthing else works The gm reman ecm will fire injector #6 and the car runs great but the trans shifts very hard The interchange ecm (95 aurora) the car just runs in defalt mode and has "no pcm data" any idea's? |
RE: 1994 ECM PCM INSTALL??
Was reman ecm new or junkyard also? Do numbers on replacement ecms match original ecm?
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