High altitude prom advice
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Joined: Mar 2002
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From: Rio Rancho, NM
Car: '92 RS
Engine: 305 TBI
Transmission: 700R4
High altitude prom advice
1992 Camaro RS 25th Anniversary 305 TBI Hypertech 122362 prom 1228746 ecm
I live outside Albuquerque, so the elevation is about 5300'. The car never ran great since moving here, but now to keep the engine running I have to have the MAP sensor disconnected. If it is connected the engine seems to over compensate adjusting idle and stalls out. The computer is not throwing codes, the vacuum feed to the MAP sensor is fine, and I've tried a couple MAP sensors.
I have bench tested the sensors and at this altitude the range of the sensors averages about 3.9V at 0" Hg to .5V at 20" Hg. Could this prom be part of the problem? If so can someone recommend a baseline prom that works well at altitude?
I live outside Albuquerque, so the elevation is about 5300'. The car never ran great since moving here, but now to keep the engine running I have to have the MAP sensor disconnected. If it is connected the engine seems to over compensate adjusting idle and stalls out. The computer is not throwing codes, the vacuum feed to the MAP sensor is fine, and I've tried a couple MAP sensors.
I have bench tested the sensors and at this altitude the range of the sensors averages about 3.9V at 0" Hg to .5V at 20" Hg. Could this prom be part of the problem? If so can someone recommend a baseline prom that works well at altitude?
Last edited by darth442; Mar 5, 2014 at 01:00 AM.
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From: Waxahachie Texas
Car: 88 IROC Z/28-under re-construction
Engine: 5.7 Tuned Port
Transmission: It's in there....
Axle/Gears: 9 bolt Borg-Warner
Re: High altitude prom advice
Contact "Tuned Performance" here on the Forum, he's in Colorado and will be able to help you .
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