Low MAP Voltage (code 33)
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Junior Member
Joined: Aug 2004
Posts: 58
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From: Texas
Car: '92 RS Camaro
Engine: '92 SD 305 TPI
Transmission: BW 5 speed
Axle/Gears: Stock Open 3.08:1
Low MAP Voltage (code 33)
I have a '90 Corvette speed density TPI system in an older car. It has run almost perfect until very recently when I began getting a code 33. My information says this is "low voltage at the MAP sensor". When the trouble light comes on with this code, the car will run rough near idle for a few seconds but with any following acceleration the light goes off and the car seems to accelerate OK. This may not happen again for a few minutes (mostly in town traffic) but seems to come and go. I have changed the MAP sensor, the vacuum tube between the MAP sensor and the plenum along with trying a second computer. None of these changes appear to make any difference. Anyone have any ideas/suggestions?
Senior Member
Joined: Apr 2006
Posts: 685
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From: CT
Car: 1988 Iroc
Engine: 5.7L
Transmission: '96 T56, Hurst Shifter, Mech VSS
Axle/Gears: 3.45 9 Bolt
Re: Low MAP Voltage (code 33)
I have had my share of code 33/34 problems (maf not map), mine ended up being the pigtail connecting to the maf, maybe give that a try.
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