[DeTomaso] Oil Pressure Gauge
MikeLDrew at aol.com
MikeLDrew at aol.com
Wed Aug 31 20:36:35 EDT 2016
In a message dated 8/31/16 17 26 15, mbefthomas at comcast.net writes:
> I'm trying to figure out why I'm getting a pegged reading on my oil
> pressure
> gauge. It will show normal pressure as the car starts, but soon after
> pegs
> to the right and stays there. Everything runs fine otherwise. I've
> swapped
> out the pressure sender, NAPA OP6091, and it's still pegging, so I'm
> suspecting the gauge. Anything else I could check?
>
>>>Calling Bill Taylor! That is, assuming it's an electrical. You can't
make that assumption though.
I *think* I may have stumbled across something. Doing some primitive
Google research, I confirmed what I thought I knew, which is that the oil
pressure gauge works by taking 12V power in, which runs across the gauge, then out
to the sender unit, which is a variable ground. The reading given by the
gauge depends on the resistance of the sensor unit; this in turn is
determined by the engine's oil pressure.
Extremely high readings after a cold start, if they are accurate, mean the
pressure relief valve near the pump and filter has probably stuck. The
engine should be switched off or the oil filter could burst.
I have a mechanical oil pressure gauge which threads into the hole normally
occupied by the electric sender. It is used to 'sanity check' the
readings on the gauge. It's the first troubleshooting tool; if the mechanical
gauge reads high, you have an engine (or at least oil filter) problem. If it
reads normally, you have an electrical problem.
I could mail it to you tomorrow and you would have it by the weekend? Let
me know if you would like to try it out.
Mike
-------------- next part --------------
In a message dated 8/31/16 17 26 15, mbefthomas at comcast.net writes:
I'm trying to figure out why I'm getting a pegged reading on my oil
pressure
gauge. It will show normal pressure as the car starts, but soon
after pegs
to the right and stays there. Everything runs fine otherwise. I've
swapped
out the pressure sender, NAPA OP6091, and it's still pegging, so I'm
suspecting the gauge. Anything else I could check?
>>>Calling Bill Taylor! That is, assuming it's an electrical. You
can't make that assumption though.
I *think* I may have stumbled across something. Doing some primitive
Google research, I confirmed what I thought I knew, which is that the
oil pressure gauge works by taking 12V power in, which runs across the
gauge, then out to the sender unit, which is a variable ground. The
reading given by the gauge depends on the resistance of the sensor
unit; this in turn is determined by the engine's oil pressure.
Extremely high readings after a cold start, if they are accurate, mean
the pressure relief valve near the pump and filter has probably stuck.
The engine should be switched off or the oil filter could burst.
I have a mechanical oil pressure gauge which threads into the hole
normally occupied by the electric sender. It is used to 'sanity check'
the readings on the gauge. It's the first troubleshooting tool; if the
mechanical gauge reads high, you have an engine (or at least oil
filter) problem. If it reads normally, you have an electrical problem.
I could mail it to you tomorrow and you would have it by the weekend?
Let me know if you would like to try it out.
Mike
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