turbo boost gauge problems

[tech1gmc]

On my '87, I have the digital dash, and the turbo boost gauge does not work. Is it the instrument cluster or something else?

 

[mikestertwo]

On my '87, I have the digital dash, and the turbo boost gauge does not work. Is it the instrument cluster or something else?

I thought the digital dash only had a boost indicator, not a gauge.

 

[TurboMonte 2]

Probably a bad MAP sensor--but in-dash indicator would likely be in error anyhow (typically reading HIGH though, with age/corrosion...).

Pressure-up the MAP sensor & ck output voltage to dash/gauge...

 

[Antagon]

I don't know anything about digital dash's, i'd assume check whatever hose it gets the vac. reading from? Failing that, John at Caspers is THE electronic guru

 

[tech1gmc]

What do you mean to pressure up the map?

 

[Antagon]

What do you mean to pressure up the map?

Apply pressure (boost) to the vacuum line going into the MAP, and test the wire leads on it, the voltage should go up as pressure (boost) does

 

[TurboMonte 2]

Apply pressure (boost) to the vacuum line going into the MAP, and test the wire leads on it, the voltage should go up as pressure (boost) does

Eyup--exactly what I mean... MAP sensor should be under-hood, pass. side, with line running to engine for vac/pressure signal (this is the one to pressurize--key on--engine NOT running)...