Hey guys,

New to the rotary scene and just picked up a 87 TII yesterday. I noticed that the boost gauge is not working when I start the car or when i'm driving. The gauge stays still as if its not connected. I looked around for disconnected wires but didnt see anything out of place.

Can someone help guide me to get the boost gauge working?

87 Turbo II 13B Stock, no mods.

 

On the passenger side shock tower, make sure that the pressure sensor (there is a vacuum line running from it to the intake manifold) is plugged in.

 

It wouldn't be such a bad idea to invest in an aftermarket boost gauge. (Just an option.) - If what Aaron Cake is saying may be the problem... A new gauge won't 'fix' that. That vacuum line MUST be attached.

 

Brown/Red wire at the sensor (plugged in) should read 2.3 to 2.7 volts w/key to on and vacuum hose to sensor disconnected.

 

thread revival...

whats the little "dial switch" just next to the pressure sensor? it has a little "R" and "L" on it?

 

That's the Variable Resistor, used for setting the idle. L is for lean and R is for rich. It's set at the factory and not really supposed to be fiddled with unless the component is being replaced or someone else fiddled with it.

 

it has a blob of what looks to be RTV or JB weld or something of that nature in there. is that how the factory locked it or is that a sign that someone has been in there putzing with it?

 

Factory done.

 

awesome. thats what i wanted to hear. doesnt seem like anyone's screwed with it.

 

here this has some wiring guides on it hope this helps Foxed.ca - Mazda RX-7 Manuals