Tachometer temperature-sensitive?

[Danno_MN]

Okay - as long as I'm lookin' at fixing the problems with my new '97 T, I've got a very confusin' one. The tachometer doesn't read in subzero temps, until the engine warms up considerably. This morning, (-4F, but it started - yay!), the tach was totally flat until the engine warmed up enough for heat to start blowin', but still wouldn't get up over about 500 rpm for another couple of minutes, then started reading normally.

Now, my ears are my usual tach, so this isn't at all critical, but I am confused - what would cause this? Is the sending unit temperature-sensitive, or do I have an iffy connection somewhere along the route?

This truck had been totalled, then rebuilt by the guy I bought it from, so I'm expecting some problems with the wiring harness - is this just one of those?

Danno, who's gotta invest in better tools today....

[BamZipPow]

Being that it was in a wreck and not knowing what the status of the harness was at the time...I would trace the wiring and see if it got traced or not.

The tach shouldn't be temp sensitive at all...a bad solder joint or connection will be.

[Danno_MN]

Oh, it's almost certain that he did as much a high-quality job with the wiring as he did with the spark plugs - I'm just glad to hear it sounds like an iffy connection, rather than a bad sender unit. I'll get to track down the intermittent brake-light short, too - but cold, bad tools and all, it was fun wrenchin' again, so I 'spect I'll be tinkering with this and my old Honda 750 this summer.

Danno
who finds it easy to be ambitious sittin' on my butt upstairs....