my temp guage doesnt move at all. When i turn the key it just sits there so i never know what temp my engine is running at. What could be the prob and how do i fix it.

 

sounds like the temp sending unit on the motor there are 2 but i think it is the one on the front of the motor near the top radiator hose inlet but i may be mixed up

 

is that the thing that plugs in right above the iac?

 

it should be right on the intake next to the top hose inlet

 

There is only one sending unit, it's in the drivers side head between exhaust ports 1 & 3. The one for the ECM is a sensor. Tha coolant temp sensor is located under the throttle body, in the front of the manifold on a TPI.

Is the gauge sweeping during crank ? (full hot)

 

No the guage doesnt move at all every

 

It may have moved on to a better place then.
When you start the motor (crank), the gauge should ground, through the ignition switch, causing it to shoot up to full temp.

With the key on, ground the single green sender wire to anything ('clean' metal). If you still get nothing, full temp, then the gauge may be finished. A new sending unit won't fix the problem.

 

Just came back to this thread, suddenly after resetting my ecm my guage now spikes when i crank the engine but it only goes to 100 and never moves up from there. Where is the temp sending unit and how will i know if its no good or even there?

 

Try hitting your dashboard in the area above your temp gauge a couple of good times. When my temp gauge stopped moving 2 years ago I thought it was the sending unit's fault. Turns out hitting the dashboard fixed it!

 

lol i think ive tried that didnt want to hit it to hard since i still have a crack free dashboard lol. But it sucks never knowing if im running hot or not.

 

Do you mean smack it with the Harley tool AKA ball peen hammer???

 

Nah, just one of your hands will do, lol.

 

same if not similar here

when i start my car marker goes straight to full then right back down to nothing lol

 

 

i have a similar issue with my 89 RS 2.8 except mine is past hot and never moves down ive hit the dash with no change it dropped once and worked fine until i shut the car off when i started it again same thing way past the coolant temp symbol on the gauge and never comes down being winter and knowing signs of overheating i havent worried much but come spring would be nice to know what its issue is ive replaced the sensor for the gauge and did nothing

 

 

Hello, the temp gauge wire on my car is missing. I,m trying to reconnect it, but i cannot find where to reattach it. I found a green wire going to the horn, a green wire that runs through a relay on the fire wall, it has a brown/white wire coming from it which has been cut, and finally I have a light green wire which runs down the firewall towards the transmission. The gauge in the car is pegged to the top. I really didn't want to have to unhook the bulk head to find the F5 pin. any suggestions? Thanks in advance.

 

 

Thanks for the advice, I'll try the instrument cluster this weekend.