i have a 95 honda accord lx. for the past month or two when i accelerate my tempature gauge goes way down below cold and goes back up to normal between gears. a lot of people told me to bleed the cooling system but it still does it. any help would be much appreciated. thanks

 

please help

 

The first two things that spring to mind are an electrical problem, such as a loose or corroded ground, or a mechanical problem with the temp sensor. If the ground is poor, the signal going to the gauge or ECU might be getting corrupted with noise, causing it to get a little weird. The noise would be different depending on RPM and engine load, which is why that may be the problem.

If it's a mechanical problem with the sensor, the sensor inside the sensor housing could be making poor contact during high vibration under acceleration. Those are just two theories I have, but there are other things it could be.

If you needed to bleed your coolant system, you'd see the temperature spike pretty badly. Coolant temp sensors don't respond very fast, so I doubt a bleed problem would make a noticeable change in the short time between gears.

Strange problem, any more info?

 

not really, it doesnt seem to have any performance issues, and it seems to be getting worse over time. it has a new timing belt and water pump and thermostat. u may be right with the vibration thing. i really appreciate u takin the time to think bout it

 

Well, it's kind of a pain in the ass to replace because of the coolant, but temp sensors are cheap so that may be an easy thing to try. But, I generally don't recommend blindly replacing things without troubleshooting first, unless you can concretely point a finger at it.

You can test it with a multimeter, but if it's something that's being affected by vibration or electrical noise, you may not actually be able to replicate the problem with a multimeter. You could put a meter on the signal wire when the car is running though. Check the Honda (Helms) factory manual and see if anything in the troubleshooting section jumps out at you as symptoms.

 

bad wire grounding it self somewere. check the harnes for damage and missing insulation.

 

thanks for all the input, ima take a in depth look at it today

 

thanks for all the help. i just found the problem today. it was a ground wire that connects to the block. it had a loose conection, and what do ya know, thats what it was.

 

nice.