speedometer question
#1
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Car: 1991 Z28
Engine: 355 TPI
Transmission: 700r4
Axle/Gears: 9 bolt disc / 3:27
speedometer question
I've found that my speedo stopped working. I thought it was the vsS so I changed it. No luck. Then I traced the wires and checked them with no prob there. Ive so far eliminated the vsS and wiring and purchased new gauges. I went to install the gauges and found that the plugs for the two speedometers are different. Does anyone else have this problem? Anyone know where I can buy the board the speedometer plugs into?
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Car: 1991 Z28
Engine: 355 TPI
Transmission: 700r4
Axle/Gears: 9 bolt disc / 3:27
Re: speedometer question
I have changed out the gauges but still the speedometer doesn't work. I've replaced the vss as well as the gauges and checked the printed circuit board. I guess that Leaves the wiring and ecm right?
#5
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Car: 1991 Z28
Engine: 355 TPI
Transmission: 700r4
Axle/Gears: 9 bolt disc / 3:27
Re: speedometer question
Is there a place to get the board the speedo plugs into? I think its the only thing I haven't tried to replace...
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Car: 1991 Z28
Engine: 355 TPI
Transmission: 700r4
Axle/Gears: 9 bolt disc / 3:27
Re: speedometer question
Any suggestions. I'm going to set it up on stands and put her in drive while metering the vSS to ensure that correct. Would a different ecm cause this problem. Its one from a v6 Beretta. I do have a modified chip burn on the ecm. Is there something in the program that's wrong?
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Re: speedometer question
are you using a 1227730 ecm? if so they were used on several applications the memcal would need to be for a v8. this ecm has a internal buffer. The vss signal goes to b9 witch is ground and b10 is the signal input at the ecm. The output too the ecm is optical coming out at B11.
http://www.youtube.com/watch?v=cbaHx89EysM
http://www.youtube.com/watch?v=cbaHx89EysM
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#9
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Car: 1991 Z28
Engine: 355 TPI
Transmission: 700r4
Axle/Gears: 9 bolt disc / 3:27
Re: speedometer question
I'm not sure whether or not it was reprogrammed to optical. I had it done by a local tuner but never got the .xdf and .bin files. That was the reason I was given as to why my laptop with USB to aldl cable and tuner pro rt can't read the ecm. I know if I could read it I could see the signal from the vss
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Car: 1991 Z28
Engine: 355 TPI
Transmission: 700r4
Axle/Gears: 9 bolt disc / 3:27
Re: speedometer question
I'll get the identifiers for the ecm when I get home. I know the memcal was changed and adapted with hardware from moates that I bought and provided to the tuner
#12
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Car: 1991 Z28
Engine: 355 TPI
Transmission: 700r4
Axle/Gears: 9 bolt disc / 3:27
Re: speedometer question
Yes the adapter is there. Not sure if that's where the speedometer problem started since the engine was being rebuilt. Before that the car was towed to my shop. He said he removed vats but if I take out my resistor the security light will come on and it appears that vats shuts down the system.
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Re: speedometer question
was this a tbi to tpi conversion, just trying to gather all the information from you too help. if the pass key module is still connected and the key cylinder with the bypass resister you should be able to run off the memcal and see if you have a speedometer then.
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Car: 1991 Z28
Engine: 355 TPI
Transmission: 700r4
Axle/Gears: 9 bolt disc / 3:27
Re: speedometer question
This has always been a tpi motor. When you say run off the memcsl... elaborate
Last edited by DrewsCam; 05-16-2012 at 02:22 PM.
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Car: 1991 Z28
Engine: 355 TPI
Transmission: 700r4
Axle/Gears: 9 bolt disc / 3:27
Re: speedometer question
I recognize that adapter as one that is in my ecm with a new prom chip attached
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Car: 1991 Z28
Engine: 355 TPI
Transmission: 700r4
Axle/Gears: 9 bolt disc / 3:27
Re: speedometer question
Ahhh there's the hiccup...dont have the original memcal. It was fro
A v6 Chevy Beretta though
A v6 Chevy Beretta though
#22
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Car: 1991 Z28
Engine: 355 TPI
Transmission: 700r4
Axle/Gears: 9 bolt disc / 3:27
Re: speedometer question
do you think i should try and erase the chip and go back with a base stock setup..
#24
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Car: 1991 Z28
Engine: 355 TPI
Transmission: 700r4
Axle/Gears: 9 bolt disc / 3:27
Re: speedometer question
I am using this ecm.. the memcal is a moates chip with adapter... i guess you could say its a prom more than memcal
Last edited by DrewsCam; 05-17-2012 at 05:34 PM.
#25
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Car: 1991 Z28
Engine: 355 TPI
Transmission: 700r4
Axle/Gears: 9 bolt disc / 3:27
Re: speedometer question
oops
Last edited by DrewsCam; 05-17-2012 at 05:38 PM. Reason: posted to wrong thread
#27
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Car: 1991 Z28
Engine: 355 TPI
Transmission: 700r4
Axle/Gears: 9 bolt disc / 3:27
Re: speedometer question
Sorry the oops was a post I had to move to my other thread
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