Oil pressure problems.....
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Post Fiend
Joined: Oct 2005
Posts: 5,242
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From: Kiev, Ukraine
Oil pressure problems.....
Howdy to all.
Strange oil pressure problem appeared.
Oil pressure drops down undere the load.
3.5-4 Bar at idle, but when I press gas pedal down pressuire decreases to 1.2-1.5 BAR, when I release gas pedal pressure goes up to 4-5 bar.
What is goin on???
Strange oil pressure problem appeared.
Oil pressure drops down undere the load.
3.5-4 Bar at idle, but when I press gas pedal down pressuire decreases to 1.2-1.5 BAR, when I release gas pedal pressure goes up to 4-5 bar.
What is goin on???
Post Fiend
Joined: Jan 2000
Posts: 5,860
Likes: 4
From: Metro Detroit (Redford)
The idea is that loose rod big end bearings will throw off a lot of oil from centrifugal force the faster they spin, and so pressure drops. Could be the culprit, but as 96_4wdr says, the clogged screen also could be.
Junior User
Joined: Jun 2006
Posts: 99
Likes: 0
From: Newmwnstown, PA
Pablo, I had similar symptoms and worried it would require oil pump replacement or worse. I decided to replace the oil pressure sending unit - hidden near the distributor under the doghouse. It's cheap, but difficult to replace. You might want to try that first.
Good luck.
Michael
'93 Aero 3.0L EXT 2W
Good luck.
Michael
'93 Aero 3.0L EXT 2W
Thread Starter
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Post Fiend
Joined: Oct 2005
Posts: 5,242
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From: Kiev, Ukraine
I have 2 oil pressure Gauges, 1 of them is mechanical connected with hose. That's why there is no mistake. Both of them reads the same pressure. To replace pressure sending unit is unusually easy, 1 wire only, 1/4'' cone thread.
The problem is that oil pressure drops under the load only, not depending on RPM.
I suspect old worn bearings. The other symtom - cranckhaft seal leaks. No blue smoke, but I add a quart of oil every mounth (2 000 miles).
The problem is that oil pressure drops under the load only, not depending on RPM.
I suspect old worn bearings. The other symtom - cranckhaft seal leaks. No blue smoke, but I add a quart of oil every mounth (2 000 miles).
Elder User
Joined: Dec 2006
Posts: 830
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From: Kitchener,Ontario,Canada
Originally Posted by Pablo-UA
I have 2 oil pressure Gauges, 1 of them is mechanical connected with hose. That's why there is no mistake. Both of them reads the same pressure. To replace pressure sending unit is unusually easy, 1 wire only, 1/4'' cone thread.
The problem is that oil pressure drops under the load only, not depending on RPM.
I suspect old worn bearings. The other symtom - cranckhaft seal leaks. No blue smoke, but I add a quart of oil every mounth (2 000 miles).
The problem is that oil pressure drops under the load only, not depending on RPM.
I suspect old worn bearings. The other symtom - cranckhaft seal leaks. No blue smoke, but I add a quart of oil every mounth (2 000 miles).
Bearings would be knocking/rumbling like crazy with that much drop in oil pressure......... bearing shell cracked up?
Whats your oil pump like? maybe it's got a low flow problem, good idea to check that oil pick-up screen. Not good to run engine like that !
