Eating Tach sensors

[MidnightBlade]

Truck had the factory tach sensor from 150k ago, it went bad, replaced it with a UHaul tach sensor about 2 weeks (roughly 200 mi.) before I parked it. It sat for about a month with the trans out, buttoned it all back up and ran it for about 3 days now and the tach sensor quit again.

Has anyone else had this problem with a Uaul tach sensor?

 

[icanfixall]

The senser is a magnet. Remove it and clean off any stuff thats collected on it. Hopefully you don't have a bunch of metal washing thru your engine but this isone place tofind it. The other is the oil pan drain plug....

 

[itsacrazyasian]

Truck had the factory tach sensor from 150k ago, it went bad, replaced it with a UHaul tach sensor about 2 weeks (roughly 200 mi.) before I parked it. It sat for about a month with the trans out, buttoned it all back up and ran it for about 3 days now and the tach sensor quit again.

Has anyone else had this problem with a Uaul tach sensor?

Nope, mine works just fine. Actually even my stock one works just fine. I had a bad/intermittent connection at the plug. I cleaned the pins, tightened them up a little and dabbed a little Oxgard to keep corrosion at bay and unlike Dielectric grease it improves conductivity. just don't get it crossed across both pins or you'll have a short.

 

[MidnightBlade]

Make that 3 sensors now . I pulled the one from my spare turbo engine and it does the exact same thing

There is NO metal at all on ANY of them

At idle it will read 500 RPM, at where I know for a fact is 2000 Rpm it is at 1100 (I wish that's what I cruised at ) and on the governer, foot to the floor in nuetral, it reads 1900 Rpm. The tach will move at the same time as the engine is revved but it is not near the right reading, no dead spots. I have no idea what's going on with it

 

[lotzagoodstuff]

Maybe the tach guage itself is bad

I don't know how tempermental they are, my tach has always been "lazy" when cold but once the oil temp warms up it seems to work. I've pulled it out, cleaned it and reinsulated the wiring with liquid tape and it seems to be about the same: still lazy.

Or maybe it's me that's lazy, because I haven't been motivated enough to fix it.......

 

[Jbevs]

I think its your gauge. Can you verify on another engine that the sensors are bad? Just a WAG from me though.

 

[MidnightBlade]

There is one problem with that plan though, I have the only IDI within 100 Mi or so of me, (that I know of)

 

[itsacrazyasian]

check the tach ground at the cluster.

 

[MidnightBlade]

Well, it fixed itself about a mile away from home tonight. Downshifted and I noticed the tach jump to 2500 RPM and the idle is now 650

 

[icanfixall]

Its just got to be a bad connection and probably the ground as posted above.... The big problem is actually finding it when you tear apart things. Good to know its not eating the senders... That could be a real mess...

 

[rhkcommander]

let me know if you plan to get rid of one, I need to test mine but I think I got a bad one out of the package

if not its the gauge...

 

[Kevin 007]

Where can you get tach sensors? I have replaced mine twice before but with used sensors. Im just started to get a fluttery reading on the tach today and want to get a new sensor ASAP as I have the E40d

Can you get sensors at a NAPA or something? Im scared to find out what Ford is asking for one.

 

[Midwest_Mudder]

when i spoke with ford they wanted like 80 bucks for a brand new one. been tryin to find one on the Uhaul website, just dont know what to look under!

 

[MidnightBlade]

Got mine from UHaul for $60 or something like that

 

[itsacrazyasian]

someone here *cough* bought up all the ones at Uhaul.