tach just quit

[88BII]

i have a 92 explorer with a 4.0. i was driving down the road and the tach just quit. its sitting at 0 and it wont move. what do you think would cause this?

 

[MAKG]

Did any other things quit as well? Like the voltmeter and dinger?

If so, a fuse blew. I think it's #17. Find the short to ground first.

 

[88BII]

well i went out to mess with it and the tach was working. and the volt meter and dinger were still working.

 

[Twizzler09]

My factory tach does that too, I think its got something to do with the cluster.

I got an aftermarket tach and wired it into the tach input wire from the PCM and it reads fine. Narrows it down to either a short in the wire somewhere between the firewall and the connector, or the tach/cluster itself.

Hope that helps a bit.

 

[88BII]

i dont wont an aftermarket tach. i just wont mine to work correctly. ill do some checking tomorrow, just for kicks what about the cps.

 

[Twizzler09]

I didnt say to just replace your factory tach with an aftermarket one, just said that in hopes that'd youd use that to help you narrow your search a bit. My factory tach does the same thing, and its either a short somewhere between the firewall/connector or the cluster is going bad (which I could believe.... dash lights keep going out and upon fist-impact they turn back on)

cps- camshaft position sensor? Or Crankshaft Position Sensor? Being a '92 s'ploder... itd have the Crank sensor. You'd think if the crankshaft sensor was going bad, youd have a CEL on, and possible no-start/rough running situation. As the crankshaft sensor tells the PCM where the rotating assembly is in its rotation in relation to ignition timing. Or something like that.