intermittant tach.

t2933rm · 08-14-2001, 10:00 AM

i just had my ac serviced (ouch!) and now i am haveing tachometer problems. when they do a leak check, i believe they look under the dash. could they have disconnected a wire or something?

the tach sometimes works fine but sometimes it does not come on at all. if i hit the right bump, it usually starts.

any sugestions or areas to look at?

i have an 84' 944na

scottewid · 08-14-2001, 11:58 AM

I had an 84 and it did the same thing. Apparently this is pretty common and the consensus solution (short of replacing it) on this board was "..give it a whack.." So whenever I started, I'd tap the dash and she'd come to life.

85944na · 85944na's Garage

mine did this too, i replaced it with a used one and no more problems, they go on ebay for around 10$

T86951 · 08-15-2001, 08:06 PM

when it doesn't work tap on the tach glass/plistic cover and it should start working

Andre · Andre's Garage

Its probably a lose ground in the dash. I'd just take 30 minutes to take the whole thing apart and go over it and look for anything not right. But i guess the "whack" approuch is good too. After a while i'm sure it be reaction like turning your lights on or something.

justin · justin's Garage

I have to whack mt dash everytime I start my car.........just like Andre said it's like turning on your headlights

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Drive it like you stole it........Justin

t2933rm · 08-20-2001, 04:12 AM

THANKS! everyone, i have been on a short work trip so i am sorry for the untimely thank you!.

Dave951M · 08-20-2001, 01:03 PM

There is a ground bus under the dash in front of the glove box. The glove box doesn't have to come off, but it's rather tight in there. There are 7 circuts grounded there. Might want to check those to since the instrument circut grounds through there.

Dave951M

88_944 · 88_944's Garage

t2933rm, what year is your 944? If its the 85 1/2 and up, my tach and the speedo goes on and off sometimes. So this is what I do, just hit the trip botton on the vent and the tach should go back on. Try it.

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PORSCHE There is no Substitute!
My 944 Site! http://www.skybusiness.com/dean/

[This message has been edited by 88_944 (edited 08-20-2001).]