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Boost Guage Not Working...

groper

By groper,
in Engines & Forced Induction

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wrxhoon Grand Master

wrxhoon

Posted
Posted
can someone describe where the boost guage gets its signal from so i can fix? its an rb26 r33 gtr... new car so still learning where everything is...

The tube to the map censor is probably broken , they get fragile from the heat . Just look for a tube ( about 5mm thick) going from the rear of the plenum to the map censor near the brake booster .

groper Explorer

groper

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The tube to the map censor is probably broken , they get fragile from the heat . Just look for a tube ( about 5mm thick) going from the rear of the plenum to the map censor near the brake booster .

so does the guage see a voltage signal from the map sensor? or does it see a physical vacuum signal all the way back to the guage?

JustinP Mentor

JustinP

Posted
Posted

Yer mine (R34 GTT) only works intermittently, very annoying. I checked that hose to the MAP sensor and its fine. Hope I don't have to rip the dash apart :P its the only thing wrong with the whole car.

groper Explorer

groper

Posted
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always get an aftermarket guage that reads in something more useful eg PSI.

oh btw, its a nismo center cluster... how do these work, electrically or mechanically via vacuum?

contacted the guy i bought the car off, he said he had a new battery installled day before i picked it up and it was working before this??? hmmm...

wrxhoon Grand Master

wrxhoon

Posted
Posted
so does the guage see a voltage signal from the map sensor? or does it see a physical vacuum signal all the way back to the guage?

Did you check the tube ? The tube goes to the map sensor and then voltage from there to the gauge . The gauge is electric not mechanical.

groper Explorer

groper

Posted
  • Author
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ok im not entirely sure which is the map sensor your talking about? can anyone tell me how to fault find the source of this problem? none of the hoses off the intake plenum look perished... there is an electrical sensor at the front of the plenum? what does it do?

i pulled the dash apart and checked the wires and connection at the gauges, looks fine... no busted hoses under the bonnet... what next???

someone please help me out!

wrxhoon Grand Master

wrxhoon

Posted
Posted

Did you read post 2?

The tube to the map censor is probably broken , they get fragile from the heat . Just look for a tube ( about 5mm thick) going from the rear of the plenum to the map censor near the brake booster .

REAR of the plenum NOT front.. You will find a steel tube about 30-40mm long and about 4 mm thick, get a new tube and plug it in there, don't even try to re-use the old hose, the same thing will happen again ..

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