code 34 and 45
04-28-2005, 08:58 PM
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Car: 87 firebird,89 formula,74 Olds that runs 12.34
Engine: LG4,L98,455Olds
Transmission: 7004r,7004r,th350
code 34 and 45
I have a 1987 firebird with an LG4 and am getting these codes. At first I thought it was the vacuum line. I hooked it back up and it ran much better b/c the vacuum leak was gone. After driving it for a couple of days it was bogging again. When I tested for voltage it stays at 4.1 volts with and without vacuum hooked to it. Does this mean the MAP sensor is bad? It is carbureted so I guess its called a differential pressure sensor or something like that....
04-29-2005, 05:11 PM
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Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
It's a manifold absolute pressure sensor. Assuming you were checking the proper one (the barometric sensor is the same part, nothing connected to it but wires).
04-29-2005, 09:26 PM
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Car: 87 firebird,89 formula,74 Olds that runs 12.34
Engine: LG4,L98,455Olds
Transmission: 7004r,7004r,th350
Well I just changed the MAP sensor out and that isnt it. But no codes yet. Assuming I get the same codes again I guess the O2 sensor is bad. Could it be anything else? Thanks for the reply.
Thanks for the reply. 
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