strange oil pressure problem

[Project 77]

ok...so I was driving the car ths past week and the oil presure would go up and down real erratic, so I got oil, and a filter and changed it (used 10w30) and it still does it. idle it has like 20 psi and if I increase the RPM's slow it climbs to about 40 psi. If I nail it it drops way down below 20 psi then climbs up slowly. oil is new, filter is new...and ideas???

 

[jeffnoel]

Something may be blocking th pickup, you may need to drop the pan and inspect.

 

[Mstng2]

Something may be blocking th pickup, you may need to drop the pan and inspect.

Yep, what Jeff said, when it pulls higher volumes of oil something is sucking up against the pump screen. Sounds like a drop pan project to me also.

 

[itsaMustangtoo]

My god , you guys sure are quick to get greasy!! ( drop the pan) EVER hear of a faulty guage?? FIRST, I would take the line off the oil pressure gage and blow it out. If that did not fix it I would get a known good gage and hook it up in it's place.

 

[jeffnoel]

Your "assuming" he's got an aftermarket mechanical pressure gauge. It won't do him any good to blow and the wire coming from the factory sender. And since he says the gauge appears to work normally except when romped on that why I didn't say the gauge.

 

[Wart]

Never mind.

 

[Wart]

Your "assuming" he's got an aftermarket mechanical pressure gauge.

He sold him the car.

It won't do him any good to blow and the wire coming from the factory sender.

The II came with an oil pressure idiot light.

And since he says the gauge appears to work normally except when romped on that why I didn't say the gauge.

Yep. It seems if the gauge was dropping then rising with an increase of pressure it should do it all the time, not only when free revved/ romped on.

I would put the gauge on my shops air system and see if I could make the gauge screw up, and compare readings with the regulator gauge and/ or one of my other gauges.

 

[2muchtime]

was this problem all of the sudden or over time get worse?

1st what type of mech; guage r u using ?
those little white tubes r all 2 common for air leaking through the fittings
which would give that exact symptom. go to napa for a mechanics oil
pressure tester. thread it to the block not to the adapted fitting from ur guage........ same reading ?

2nd are u using a fram filter? if yes try a different brand... theyr the worst filter out there at this time.. causing many failures.. i get my filter from the ford dealer only (same price as anywhere else even w-mart) and use
20/50 oil.....same reading ?

if u verified all the above as ok or no change ....it needs an oil pump...clogged pick up or not.

 

[itsaMustangtoo]

Your "assuming" he's got an aftermarket mechanical pressure gauge. It won't do him any good to blow and the wire coming from the factory sender. And since he says the gauge appears to work normally except when romped on that why I didn't say the gauge.

No, I am not assuming it is a mechanical guage, I know it is. It was my car 3 weeks ago!!

 

[jeffnoel]

No, I am not assuming it is a mechanical guage, I know it is. It was my car 3 weeks ago!!

And I'm supposed to know that how!!! Wonder why he didn't contact you 1st directly????

 

[itsaMustangtoo]

And I'm supposed to know that how!!! Wonder why he didn't contact you 1st directly????

Because I never assume anything. Why he did not contact me first I do not know. But contact has been made and we are going to wring it out.

 

[Project 77]

I found the problem and fixed it, the oil filter had a bad rubber seal, it was leaking oil. I changed the oil and usd a WIX filter. No leaks, and no more oil pressure problems.

 

[2muchtime]

And I'm supposed to know that how!!! Wonder why he didn't contact you 1st directly????

because its in the starting thread when he stated 20 and then 40 psi...
factory guages dont have numbers...
admit u were just being a smartass (blowing the wire) lol

----------------------------------------------------
project77
atleast it was an easy fix ...did u have a fram on there, before the wix?

 

[jeffnoel]

your right I didn't think it out , my bad

 

[itsaMustangtoo]

And you guys wanted him to drop the pan Well I gotta run. Check engine light came on last night, so I am going to yank the motor out.

 

[1badII]

Because I never assume anything.

Assumption is the mother of all **** ups!

 

[Mstng2]

And you guys wanted him to drop the pan Well I gotta run. Check engine light came on last night, so I am going to yank the motor out.

You can say that because it was your car. Dont piss on us because were throwing out ideas, he had already replaced the oil filter.
ok...so I was driving the car ths past week and the oil presure would go up and down real erratic, so I got oil, and a filter and changed it (used 10w30) and it still does it.

Mechanical guages do not normally have issues unless they are leaking, he mentioned watching the guage and associated it with RPM...

idle it has like 20 psi and if I increase the RPM's slow it climbs to about 40 psi. If I nail it it drops way down below 20 psi then climbs up slowly.

That leaves one thing folks, and I hope I am wrong but, blockage somehwere, I'll tell you what, based on the original description there is still a problem...

 

[itsaMustangtoo]

You can say that because it was your car. Dont piss on us because were throwing out ideas, he had already replaced the oil filter.
ok...so I was driving the car ths past week and the oil presure would go up and down real erratic, so I got oil, and a filter and changed it (used 10w30) and it still does it.

Mechanical guages do not normally have issues unless they are leaking, he mentioned watching the guage and associated it with RPM...

idle it has like 20 psi and if I increase the RPM's slow it climbs to about 40 psi. If I nail it it drops way down below 20 psi then climbs up slowly.

That leaves one thing folks, and I hope I am wrong but, blockage somehwere, I'll tell you what, based on the original description there is still a problem...[/Q. UOTE]

No-NO-NO Just because it was and is my car does not mean anything. I am not pissing on anyone. I just do not think " dropping the pan " is a good idea to throw out there. Let me ask this, if you were to drop the pan ,with this problem ,what would you expect to see?? Exactly!! you don't know!! So why not take a diagnostic aproach first? I like to go in reverse. WHAT was the LAST thing I did before the problem. If for instance I rewired something, now the alt is not charging. I am not going to yank & replace the alt/regulator/batt/etc. ( which some people would do) I would go back and check the wiring. I am going to give credit where credit is due though. That leaves one thing folks, and I hope I am wrong but, blockage somehwere, I'll tell you what, based on the original description there is still a problem...

You are right on this point. It was the rubber seal. What Brian failed to tell us is that the problem started after the oil change. And that it was erratic between 40-60 psi ( read the gage wrong) yeah, seems the oil filter gasket stayed on the block , and when he put the new one on, the other one coiled up inside the new filter gasket and partially blocked the oil filter holes. I drove it home though and ALL is fine.

 

[Mstng2]

AH, now that makes sense. Glad all is well with it.