Temperature gauge

[Cissco]

What would cause the temperature gauge to drop when you accelerate? I don't mean slowly but as soon as you give it gas it drops and as soon as you let off it raises back up. I did change the gauge from a spare cluster I have and it does the same thing. Thank you and any help would be appreciated.

 

[BigPapa]

It’s probably just the regular old coolant temp fluctuation coincidentally coinciding with your throttle variations.

 

[Cissco]

I really think it is a electric problem. I don't know how the sender works. I have been driving first generations since 1998 and have never seen this. The gauge will drop from 3/8 to 0 instantly. If you are going 75 and let off it will instantly raise 1/4 mark over want it was. thank you for the reply it is just really annoying to have to let off the throttle to see the current temperature.

 

[B.G. Smith]

Check all the ground connections to engine/firewall and dash.

 

[AnonEd]

Just spitballing here that a wire is worn and when the engine moves under load (or off) the gauge signal changes based on where the wire moves and what it touches?

 

[Cissco]

Ok I will check wiring. I am guessing it's only the sender and gauge. I have a service manual for a 93 do you think the wiring would be the same on a 91.5? Hope I can look at it before the new year. Thank you for the reply's.

 

[AnonEd]

Can't say what changed between 091.5 and 93 but I have a 92 FSM if you need to compare wire colors, etc.