Hey Guys,

Two questions:

What is the likely culprit of a broken boost gauge?

What can cause the car to idle @ a steady 1400 one day, 1100 on another day, and even 600 on another day?

Any input would be appreciated, thanks.

-Shaun

 

Stock or aftermarket boost gauge?

Spray carb cleaner aroudn the mainfolds on your running engine. See if it speeds up. You probably have a vacuum leak.

 

Stock boost gauge.

Good suggestion. Will spray some today if I get a chance.

-Shaun

 

If you have a BCD installed the stock boost gauge won't work right. I would just install a good aftermarket boost gauge anyways just because it will be more accurate then the one in the cluster. I have a VDO and the backlight color is damn near a perfect match for the cluster backlight color.

 

No mods completely stock.

-Shaun

 

Has the Boost Gauge ever worked properly? It could be caused by a broken Boost Sensor since the gauge works off of a signal from the sensor. The Brown/Red wire at the sensor when plugged into the sensor, key to on, and the vacuum hose disconnected and capped should read between 2.3 to 2.7 volts.

 

Thanks, will try this when I come back from my Vegas trip this weekend.

-Shaun

 

If it makes you feel any better, the stock boost gauge is worthless anyway

 

Lol. It sort of does but i thought the sensor does more then just read boost or am i mistaken?

-shaun

 

sprayed carb cleaner all around the manifolds and lines with no changes in idle status. I guess I can rule out vac leak.

-Shaun

 

Got 2.35 volts coming from the brown/red wire. Got a variety of resistance between the different pins. I also noticed that when the car is in the on position the boost gauge goes to the neutral position but instantly drops to the bottom once the car is started or turned off. Ideas?

-Shaun

 

Anyone?

 

My TII is doing the exact same thing, Im trying to figure it out. It started after I blew a heater hose and overheated it. Someone told me that only some carb cleaners will increase idle when sprayed on a vacuum leak. I dont know how accurate that is though.

 

^ if you have a leak, sparying starting fluid around where a leak is will suck up the fluid, therefore raising idle for a minute.

 

Sprayed starting fluid on every vacuum line and fitting for the intake, no change. I guess its not a vacuum issue, what else could cause this?