Oil Pressure numbers are in

[Masterd]

Alright ive finally got some cold and hot oil pressure numbers for yo

Cold start no throttle = between 50-55

Hot idle = between 15-25

You guys will have to watch this video to see the ~2500 rpm oil pressure reading.

I really dont know what to make of it.

http://s30.photobucket.com/albums/c337/masterd151/?action=view&current=4a7fddcc.flv

Thanks!

 

[mrboyle]

What don't you understand? The oil pressure should go up as the RPM's do!

 

[Masterd]

But if you watched the video, the oil pressure should NOT fluctuate like that

 

[Masterd]

Bump

 

[trucku]

My oil pressure does not go up and down with idle. Hot idle in drive is 15lbs and in park is 20lbs (with Pennzoil Platinum 5w30)

I don't have any fluctuation like that at a constant rpm. I get constant climbs and drops accordingly to speed and temp.

Pic below (sunpro temp guage not hooked up: ignore)
The rpms were just shy of 2500

 

[trucku]

What don't you understand? The oil pressure should go up as the RPM's do!

yes but not bounce round like that. IT should be a consistent gain or decrease with rpms and oil temp. Pressure will be different depending on rpms and oil temp.

 

[Spdrcer34]

I'd try with a REAL oil pressure gauge....

That one that you attempted to use appears to be an air pressure gauge....which would be a bit on the sensitve side...

Ryan

 

[Masterd]

No I bought it from Harbor Freight and its listed as an oil pressure gauge

 

[410Fortune]

where are you taking your oil pressure from?

I suspect the gage as well, looks like its reading a good psi just the needle is bouncing

By the time you hook up the HF gage you could have installed a gage in your dash and then be able to see the oil pressure at all times, along with coolant temp, coltage or even transmission temp

gages are not expensive for decent mechanical units and I consider them mod #1 most times, the factory gages suck dittley uck

 

[Masterd]

I'm taking my pressure directly where the oil pressure sender was.

I took off the sender and installed the gauge into the spot where the sender was.

 

[410Fortune]

was your factory gage fluctuating?

 

[Masterd]

Not at all. Why?

I do realize its an idiot light.

 

[tex_n_ct]

1. I am NOT a 4.0L expert.
2. Your video was edited so that frequency of oscillation is impossible to determine.

From those 2 items, let's start.

Every oil system has a pressure relief valve to allow oil flow around a clogged filter. Try simply replacing your oil filter and see what happens.

Oscillations usually occur from 'air gulping'. Things like cracked pickup tubes (we had at least one a season in an old 427 race motor!), low oil and loose pan baffles (don't know if there is one in the 4.0 or not) can cause problems. Drop the lower oil pan, get a GOOD light and see if anything is out of normal.

There are a ton of other less frequent failures I have seen, but those are the obvious. Including a mechanic dropping a pack of cigarettes that ended up in the pan - that gave exactly the same symptoms you have.

Most important, show a short section of the video that is NOT sped up so we can see the actual indication of the problem.

Bob

 

[trucku]

did you change that filter.
We suggested it in your other thread.

http://www.explorerforum.com/forums/showthread.php?t=190646

 

[Masterd]

Tex_N_Ct,

That video has not been altered at all.

The video is a real time video of what that gauge was doing, while I was in the cab pressing the gas pedal.


Trucku,
I havent changed the filter yet, because my oil was changed 300 miles ago.

 

[tex_n_ct]

That video was manipulated in some way. Probably when you uploaded it to the image server. I didn't download it and look frame by frame, but it plays as if frames have been deleted. That is what causes the jerky motion of the image. To see what I mean go about 3/4 of the way through and watch the motion of the whole guage when you get out of the truck. If that was 'real time' movement, the g forces probably would have damaged the guage.

Thanks to TRUCKU, I see you have started this in a separate post. The info there leads me to believe you need a real mechanic. 277,000 means that there are sloppy tolerances all over that motor and too many things COULD be wrong to remotely diagnose accurately.

BTW: double entries = Romper Room No-No That's why it is called a THREAD.

Bob

 

[Masterd]

The video appeared exactly that way on the camera. I watched it several times on the camera before uploading it.

Uploading it did nothing to change the video.

 

[410Fortune]

okay I was asking if your stock gage fluctuated because if it did that would likely point to the voltage of the sensor changing, like your gage and would point to an actual oil pressure issue. If the gage is jumping around like that it might just be the gage, but if they both jumped it would confirm you have a weird fluctuation issue.

my question is does the gage ever smooth out, like at idle, or if you hold steady at higher RPM's?

How many miles on the engine? oil change history? Possible oil pump or pickup tube issues is what I am getting at

 

[tex_n_ct]

410

The video shows a mechanical (bourdon tube) guage hooked into the oil pressure sender port. So, electrical is out.

I am with you - broken spring on pressure relief, crud in relief ball seat, cracked pickup, fiduggled pump rotor, funky filter - i.e. something physically interrupting flow.

In his other thread it says 277,000. Time for flaky circulation.

Bob

 

[410Fortune]

right but his factory gage would have been electric

thats alot of miles for an oil pump even on these engines