Can anyone tell me who in Texas can reset the factory correct settings for this car. there was a guy in Dallas but he is no longer around. thanks
Ronnie
Ronnie
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Re: 92 ZR1 reboot
Ronald-----
What "settings" are you referring to?In Appreciation of John Hinckley -
Re: 92 ZR1 reboot
Ronald-----
What "settings" are you referring to?In Appreciation of John HinckleyComment
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Re: 92 ZR1 reboot
Joe
This is my friends car and he has had the battery drain a couple of times. His car has heating problems as well as low RPM performance problems. I have a 90 ZR1 and had simular problems, after having three different chevy house jack with it I took it to Frank Parr in Dallas. Thew re-programed the chip and mine was as good as new! The guy that worked on mine has gone the way of the buffelo and there new guy can not fix the problem. I have a second ZR! that has been modified by Lingenfelter and I have a spare chip that fixed the problem. So i think his chip has been corrupted due to repeated power failures.
thanks
RonnieComment
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Re: 92 ZR1 reboot
Joe
This is my friends car and he has had the battery drain a couple of times. His car has heating problems as well as low RPM performance problems. I have a 90 ZR1 and had simular problems, after having three different chevy house jack with it I took it to Frank Parr in Dallas. Thew re-programed the chip and mine was as good as new! The guy that worked on mine has gone the way of the buffelo and there new guy can not fix the problem. I have a second ZR! that has been modified by Lingenfelter and I have a spare chip that fixed the problem. So i think his chip has been corrupted due to repeated power failures.
thanks
RonnieComment
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Re: 92 ZR1 reboot
Ronald------
I don't see how that power failures (e.g. dead battery) could cause the PROM module to be corrupted. However, assuming that this happened, then I don't see why a new PROM module would not be the solution. As far as I know, this module is still available from GM, although I don't have the part number handy at the moment. 90-93 ZR-1s use an ECM with a removeable and replaceable PROM module and MEMCAL module.
If your friend has a PROM that has been custom-calibrated, that's another story. He will not be able to purchase such a module from GM. Also, and assuming that this is the case, I'm surprised that a service technician at Frank Parra Chevrolet would get involved in "custom calibrated" PROMs. As far as I know, most such "custom calibrations" are emissions-illegal.
It is possible that the repeated power failures damaged the ECM, itself. In that case, a "rebuilt with exchange" ECM is available from GM. Once again, I don't have the part number handy at the moment, though.In Appreciation of John HinckleyComment
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Re: 92 ZR1 reboot
Ronald------
I don't see how that power failures (e.g. dead battery) could cause the PROM module to be corrupted. However, assuming that this happened, then I don't see why a new PROM module would not be the solution. As far as I know, this module is still available from GM, although I don't have the part number handy at the moment. 90-93 ZR-1s use an ECM with a removeable and replaceable PROM module and MEMCAL module.
If your friend has a PROM that has been custom-calibrated, that's another story. He will not be able to purchase such a module from GM. Also, and assuming that this is the case, I'm surprised that a service technician at Frank Parra Chevrolet would get involved in "custom calibrated" PROMs. As far as I know, most such "custom calibrations" are emissions-illegal.
It is possible that the repeated power failures damaged the ECM, itself. In that case, a "rebuilt with exchange" ECM is available from GM. Once again, I don't have the part number handy at the moment, though.In Appreciation of John HinckleyComment
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Re: 92 ZR1 reboot
Joe
I wasn't present when my car was repaired but the service guy told me of the problems with the doors on a 90 vette ( door ajar lamp) so i was careful not to loose my charge after I got fixed. He may have changed some parts, but my bill was less than $150.00 and took about 30 min. My friend took his car to Dallas and did not see any improvement after the work was done. He has a stock 92 as delivered. I don't understand the electronics or the chip operation so i am not qualified to comment on the mater. I do however know that repeated battery drain will cause problems ranging from rough idle, poor performance and irregular temp readings.
thanks
RonnieComment
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Re: 92 ZR1 reboot
Joe
I wasn't present when my car was repaired but the service guy told me of the problems with the doors on a 90 vette ( door ajar lamp) so i was careful not to loose my charge after I got fixed. He may have changed some parts, but my bill was less than $150.00 and took about 30 min. My friend took his car to Dallas and did not see any improvement after the work was done. He has a stock 92 as delivered. I don't understand the electronics or the chip operation so i am not qualified to comment on the mater. I do however know that repeated battery drain will cause problems ranging from rough idle, poor performance and irregular temp readings.
thanks
RonnieComment
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Re: 92 ZR1 reboot
Ronald------
1991+ Corvette ECMs have the ability to "learn". I'm not sure if 1990 do, or not. So, when battery power is lost, everything "learned" will be lost. Then, it requires some period of driving before things are "re-learned" and incorporated into the ECM's memory. During the "learning" period, the car may run rougher and with less performance than after the initial "learning" period is completed. Usually, this should take about 1/2 to 1 hour of driving for the bulk of the "learning" process to take place. Using a 9 volt battery with adapter plugged into the cigarette lighter socket during "battery out" conditions will prevent the "learned" information from being lost (as well as prevent radio and clock settings retained in the CCM or otherwise from being lost).
The PROM module in the ECM should not be sensitive to losing other settings during battery out conditions, though. Once the module is externally programmed at the time of manufacture, those settings are "permanent" and will not be lost due to power-out conditions. For instance, the PROM modules or ECMs with installed modules may sit on the GM warehouse shelf for long periods of time with no power, at all. Then, a customer purchases the SERVICE unit, installs it, and everything's "there", just as it should be.
However, as I mentioned earlier, power surge conditions or other power "irregularities" may cause damage to the ECM, PROM, or other electronic components. In such cases, the damage is usually permanent and is corrected by replacing the damaged component.In Appreciation of John HinckleyComment
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Re: 92 ZR1 reboot
Ronald------
1991+ Corvette ECMs have the ability to "learn". I'm not sure if 1990 do, or not. So, when battery power is lost, everything "learned" will be lost. Then, it requires some period of driving before things are "re-learned" and incorporated into the ECM's memory. During the "learning" period, the car may run rougher and with less performance than after the initial "learning" period is completed. Usually, this should take about 1/2 to 1 hour of driving for the bulk of the "learning" process to take place. Using a 9 volt battery with adapter plugged into the cigarette lighter socket during "battery out" conditions will prevent the "learned" information from being lost (as well as prevent radio and clock settings retained in the CCM or otherwise from being lost).
The PROM module in the ECM should not be sensitive to losing other settings during battery out conditions, though. Once the module is externally programmed at the time of manufacture, those settings are "permanent" and will not be lost due to power-out conditions. For instance, the PROM modules or ECMs with installed modules may sit on the GM warehouse shelf for long periods of time with no power, at all. Then, a customer purchases the SERVICE unit, installs it, and everything's "there", just as it should be.
However, as I mentioned earlier, power surge conditions or other power "irregularities" may cause damage to the ECM, PROM, or other electronic components. In such cases, the damage is usually permanent and is corrected by replacing the damaged component.In Appreciation of John HinckleyComment
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Re: 92 ZR1 reboot
Ron
I also have a 90 ZR1. If you think your prom is bad, and I agree with others that this is very rare, call Doug Rippie Motorsports (also have a website) and get a prom from them. They will ask you about the car, modifications, and then burn a custom prom for you. I recently got one and it solved my hesitation problems, corrected my low idle problem and got rid of that stupid 1 to 4 shift. Not to mention it has a little more snuff!!!! (not that a ZR1 needs it!)
I do not work for and I am not invested in this company!!!!
mikeComment
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Re: 92 ZR1 reboot
Ron
I also have a 90 ZR1. If you think your prom is bad, and I agree with others that this is very rare, call Doug Rippie Motorsports (also have a website) and get a prom from them. They will ask you about the car, modifications, and then burn a custom prom for you. I recently got one and it solved my hesitation problems, corrected my low idle problem and got rid of that stupid 1 to 4 shift. Not to mention it has a little more snuff!!!! (not that a ZR1 needs it!)
I do not work for and I am not invested in this company!!!!
mikeComment
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Re: 92 ZR1 reboot
Is it possible that your friend damaged something in trying to start the car if he was using jumper cables? Evidently he does not keep the the battery fully charged when its not being driven.Comment
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Re: 92 ZR1 reboot
Is it possible that your friend damaged something in trying to start the car if he was using jumper cables? Evidently he does not keep the the battery fully charged when its not being driven.Comment
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