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post #1 of (permalink) Old 05-15-2005, 01:26 PM Thread Starter
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Strange temp guage operation on YJ

Ok this one has me scratching my head!!!!

87 YJ 258 was a 5 speed "Please go" now a TF999

Jeep sitting at idle in neutral (warmed up) guage is reading 180/190*.
Pull the shift selector into drive the needle starts dancing back and forth real fast from stop to stop on guage.
Put Jeep back into neutral and the temp reads ok again.

I also noticed the voltage guage when I drop into drive the voltage drops from 14 to 10 [img]/ubbthreads/images/graemlins/confused.gif[/img].

I already checked for pinched wires and there is not any SEEN correlation between wiring and shift lever or linkage, B&M cable shifter. Anyone have any ideas? [img]/ubbthreads/images/graemlins/wall.gif[/img]

By the way the reverse light switch on the tranny is NOT hooked up.
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post #2 of (permalink) Old 05-15-2005, 05:52 PM
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Re: Strange temp guage operation on YJ

Id guess its a bad ground to the dash and body. Its getting part of the ground through the shifter. Engine to tranny to shifter to tub.
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post #3 of (permalink) Old 05-16-2005, 01:02 AM
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Re: Strange temp guage operation on YJ

Yup, sure sounds like a bad ground. Probably getting it's ground through the shifter cable now.
Think about it - the battery is grounded to the engine - else it wouldn't start.
But the body is isolated - engine & tranny are mounted in rubber mounts. It has to have a good ground strap between body and engine. Doesn't hurt to also have one to the frame too.

Easy way to tell - hook jumper cables between the body to the engine. See if it works properly then.

And/or -- strange but I've seen it more than once - the wire close to the temp sender - rubbing something - the insulation gets worn through. It tickles against ground when the engine torques over just a tad.

He He - had a customer once - Chevy, couldn't back up, it'd stall every time. You could put it in reverse (auto), no problem, take your foot off the brake and it would stall. 2 rebuilt transmissions, lots of bills from shops all over town. Deemed "unfixable."
He He - what it was the wire to the starter solenoid from the coil's resistor bypass had rubbed bare. Under just the right circumstances, it grounded out and killed the engine.
A real hair puller (that's why I'm nearly bald.)
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post #4 of (permalink) Old 05-16-2005, 09:28 AM Thread Starter
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Re: Strange temp guage operation on YJ

OK I'll check this out Wednesday and let you know what I found. [img]/ubbthreads/images/graemlins/40BEER.gif[/img]
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