TPI 350 oil problem

[Bruce Plecan]

Cobble a mechanical guage in and try it.
Hate to open the pan to see everything perfect, try the easy stuff first
Grumpy



> Fellow efi'ers.
>
> I'm really hoping someone can help me with this one.  Although not exactly
an
> efi problem it does relate to my TPI 350Chev.  In the last few days it has
> started on this weird problem which only happens when the car is HOT.
Whenever
> you are idling the oil pressure will steadily climb to 100psi (limit of
gauge,
> so it could be more) then slowly come down to 70ish psi and climb again.
It
> will do this till the revs are increased to 1300rpm or more, at which
point the
> pressure will come down to 54ish psi where it has always been since the
engine
> was built years ago.
>
> It uses a hi-volume oil pump and has the oil changed regularly.  I'm still
using
> the same brand oil and filter I have always used.  Normal driving and idle
is in
> the viscinity of 54ish psi depending on temperature and the revs used.
Hence
> this sudden phenomen has me puzzled.  If it was an oil pump problem I
would
> expect low oil pressure, not a cyclic pressure and since it doesn't happen
when
> the car is cold it has me at a complete loss.  I can't really see how it
can be
> a faulty pressure sender unit, so my guess is that it is an actual oil
system
> problem.  My initial question is can it be a sticky valve in the oil pump
as it
> seems like pressure builds up in the system and is then released so it can
build
> up again ?  but then I wouldn't think the pressure relief valves would be
> operating at idle rpm.
>
> rgds
>
> Dan  dzorde at erggroup.com
>
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