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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / October 2007th400 transmission not shifting
I have recently swapped out my tbi for edelbrock multi-port fuel injection on my 454 1 ton chevy. I removed my factory ecm computer to install edelbrocks computer. Well I have a th400 that wont shift automatically because that little orange wire that comes off of the tranny is just hangin there. I couldnt find a kickdown switch at all on my throttle on the tbi or on the gas pedal in the cab. I know theres a transmission relay on the firewall. According to mitchells wiring diagrams the little orange wire goes to the transmission relay then to the computer I no longer have. Is that correct and if so what can I possble do to get transmission to shift. Any help would be great because Im totally stumped. >I have recently swapped out my tbi for edelbrock multi-port fuel > injection on my 454 1 ton chevy. I removed my factory ecm computer to [quoted text clipped - 7 lines] > can I possble do to get transmission to shift. Any help would be > great because Im totally stumped. The electrical connection is used strictly for forced downshifts, it won't affect the shifting if disconnected. The vacuum modulator controls the upshifting, I suspect your change to TBI has somehow interrupted the vacuum supply to the modulator. > >I have recently swapped out my tbi for edelbrock multi-port fuel > > injection on my 454 1 ton chevy. I removed my factory ecm computer to [quoted text clipped - 12 lines] > The vacuum modulator controls the upshifting, I suspect your change to TBI > has somehow interrupted the vacuum supply to the modulator. Im sorry it will still shift I just dont have any forced downshifts. In article <1191783274.447563.20540@19g2000hsx.googlegroups.com>, > > The electrical connection is used strictly for forced downshifts, it won't > > affect the shifting if disconnected. > > The vacuum modulator controls the upshifting, I suspect your change to TBI > > has somehow interrupted the vacuum supply to the modulator. > > Im sorry it will still shift I just dont have any forced downshifts. If Edelbrock doesn't offer a solution and there's nothing in any of the speed parts catalogs, you're probably going to have to scrounge the junkyards and find something off of a mid 80s pre-TBI truck. 'Something' being the electrical switch that mounts on the gas pedal bracket. > In article > <1191783274.447563.20...@19g2000hsx.googlegroups.com>, [quoted text clipped - 11 lines] > pre-TBI truck. 'Something' being the electrical switch that > mounts on the gas pedal bracket. You know whats funny I just did some reprogramming on the edelbrock tuner and its getting to shift a lot better with out that wire hooked up. But according to those mitchell wiring diagrams that orange wire supposibly goes to a relay and then goes to the slot on the factory computer that it says goes to to the brake switch. So Im wondering if that wire is just downshifting when I step on the brake. It is a 1 ton pickup. >> In article >> <1191783274.447563.20...@19g2000hsx.googlegroups.com>, [quoted text clipped - 19 lines] >that wire is just downshifting when I step on the brake. It is a 1 >ton pickup. Does it have a lock up torque converter? Many of them have sense wire from the brakes that unlocks the TC when the brakes are applied > >> In article > >> <1191783274.447563.20...@19g2000hsx.googlegroups.com>, [quoted text clipped - 22 lines] > Does it have a lock up torque converter? Many of them have sense wire > from the brakes that unlocks the TC when the brakes are applied You know I have no idea if has a lock up converter or not. I not even sure what a lock up converter does Im not to smart when it comes to transmissions? |
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