revox7

iTrader: (17)

hey all i was wondering if ne one could help me get my boost gauge working? i bought the car and didnt realize that the boost gauge didnt work its an s4 turbo and everything is completly stock any help would be great

dawicka2

I would just buy a guage from autozone and some vaccum line, and "T" in to the uim. Mount the guage by the radio or on the "A" pillar.

John ny

87 t-66

iTrader: (133)

same here. get an aftermarket one. is your map sensor hooked up? vac line going to it?

revox7

iTrader: (17)

map sensor is hooked up and vac line goin where? sometimes when im starting it up it bounces from -20 to 0 but dsnt do nething afterwards

HAILERS

How about this: if the boost gauge isn't working, then there is a very good chance the ECU isn't seeing the signal either. That's not good at all. Same signal for the guage as the ECU.

You should be concerned.

revox7

iTrader: (17)

damn well putting it that way i am concerned

87 t-66

iTrader: (133)

there should be a vacuum line going to the map sensor...is yours hooked up?

revox7

iTrader: (17)

do you mean the pressure sensor?

HAILERS

Turn the key to ON, engine OFF. Backprove pin 2B and compare it to the reading given in the FUEL AND EMISSIONS section of the FSM, sub section called Control Unit.

If it reads what the FSM says, then don't worry too much about the boost guage. But there's no good reason it shouldn't register when you do a little boost.

By the way, the pink line in the jpg attached is the ground for the boost sensor.
The Red line(s) are for the sensor input to the ECU and the Boost guage.

87 t-66

iTrader: (133)

MAP sensor = manifold absolute pressure sensor = boost sensor = pressure sensor

i would listen to hailers, he knows what he's talking about

freemanrx7

While driving under boost smack the cluster sorta hard above the cluster. Boost gauge will jump to life.

revox7

iTrader: (17)

haha i actually tried - didnt work lol

freemanrx7

Well it cured mine. That happened after I removed/installed cluster. I hit it a few times and it would bounce back to life. I've only had to do it a few times and it seems to work great now.

What are you going to try from here?

revox7

iTrader: (17)

well ima take my cluster apart i guess and if everything looks fine ima pick up an ohmmeter and ima check my ecu and the POS map sensor like the other guys recomended if all fails ima get a defi gauge

revox7

iTrader: (17)

hey guys i got my gauges torn out to check and clean all the connections and the boost gauge was working for a while and now it only bumps up at WOT i think im getting a weak signal from somewhere but i cant figure it out oh and btw the ecu is fine