I have a 1989 Ford Tbird with a 1990 Merc Cougar engine 3.8.
I just changed the oil pressure switch not the prob still low oil pressure so
I am goin to attempt the oil pump myself, any suggestions? Is the oil pump a
no brainer on this car. I work at advance auto parts but I only fix my cars
when I know I can do it for sure otherwise I have a mechanic, but lately he
is gettin a lil pricey. So heads up please can I hang????
The pump housing is cast into the timing cover on the 3.8, so yes, it's very
Are you sure you have no oil pressure? Check it with a mechanical oil pressure
If you truly had NO oil pressure, lots of lifter and rod noise would be evident
followed very shortly by the sound of parts trying to escape the engine. If you
already have these noises, then a new pump would pretty much be useless. There
common issues with this motor that can cause low, or no, oil pressure. One is a
pump drive. Remove the distrtibutor to check it. Another is bearing wash. This
caused by coolant in the oil, usually from current or recent head gasket
coolant washes the bearing material off of the bearing shells. Verify, inspect,
determine if the motor is worth saving.
Let's analyse here.. you said you changed the 'switch' do you mean
Somewhere around that year, Tbird went to a fooler gauge.. pressure SWITCH
as the sender..
That causes the needle to stay steady as long as it has pressure at all
there's a 20 ohm resistor in cars that use the fooler gauge.
If your pressure varies from very low (but higher than ign on) at idle to
just low at speed, check for that 20 ohm resistor by grounding the sender
lead. If it goes to midrange of the word "Normal" it has the resistor.
If it goes to top of gauge it doesnt have resistor and a "low" reading IS
On a 93, for instance, the resistor is on back of cluster, just solder a
small wire across it to use a real sender.
I hear on others it may be in the lead at the sender end.
I can handle basics, but an oil pump is a pretty big deal my engine is
depending on the oil pump to be done right. Naw not gonna mess with it I wil
stick to changing alternators, and starters and the easier stuff...thanks for
advice though guess i gotta pay to have it done.
Backyard Mechanic wrote:
When in doubt, use a master (mechanical) gauge to verify oil pressure. It is
the oil pressure itself that matters, not the gauge reading... therefore, it
stands to reason that we should first worry about the pressure. If oil
pressure is poor, additional engine damage can result from our attempts to
repair the gauge rather than addressing the root cause.
We would normally expect to hear increased engine noises resulting from
inadequate oil pressure..... If I've learned anything in these nearly 40
years of doing this, it is "don't take anything for granted....".If we are
to commit an error, we should do it conservitavely...
Forget it, Jim... she either cant read or she's an idiot.
My kid had a 93 cougar.. came with a variable sender... my two 93 Tbirds
both had the fooler switch.
I DONT know how much clearer I can make it!
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