I have an 88 Olds Frienza I drive to work in. Lately the gas gage goes way
high, about 1 inch above full almost every time I turn on the ignition, but
is intermittent. Banging hard on the top of the dash a few times usually
brings the reading back to normal.
Sounds to me like a maybe a ground is loose, or maybe there is a mechanical
vibrator-like voltage regulator that is sticking closed.
Any ideas on what to check?
Not sure about the 88 Frienza, but from 90 Toronado...
The guages have: Grnd, Signal, Ref 12v. The only way to have a guage go
beyond full is if the signal is higher than the reference. I would check
for a +12v line problem....is something drawing to much current in the IP
Thanks, Mike. Now I have to figure out how to get to the terminals on the
back of gauge. Space is really tight under the dash on this compact car. If
I lose the 12 v ref voltage due to a loose connection, that sounds like that
would produce those symptoms, then.
I recommend improving grounding. A few jumpers
can make a big difference in an old car driven on salty roads. Start with a
jumper from block to frame. Protect that expensive alternator by making
sure bracket paint has been scraped from contact areas.
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