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Can a clogged oil filter cause low oil pressure?

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Old 01-28-2008, 10:00 PM   #1
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Can a clogged oil filter cause low oil pressure?

I just dunno the answer to this. Dont have a Haynes or chilton either.
Old 01-28-2008, 10:02 PM   #2
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Re: Can a clogged oil filter cause low oil pressure?

the filter should have a bypass valve in it, preventing that from happening.
Old 01-28-2008, 10:05 PM   #3
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Re: Can a clogged oil filter cause low oil pressure?

I'm sayin NO this guy i know ran his truck for 110,000 miles without a oil change, and it still had the same oil pressure.
DONT ever do that, CHANGE your oil/filter.
That guy was a complete dumbass.
Old 01-28-2008, 10:05 PM   #4
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Re: Can a clogged oil filter cause low oil pressure?

Okay, so probably not likely then. I had coolant sludge in the system and was wondering if that clogged it up. doing a few oil changes to clean it all out. Can that flap get stuck open?
Old 01-28-2008, 10:52 PM   #5
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Re: Can a clogged oil filter cause low oil pressure?

I have had a few delco filters cause the oil pressure to fluctuate alot after an oil change. I change the filter again only and the problem went away. so it could be possible.

it could be the pressure switch, What oil type weight are you running and what filter
Old 01-28-2008, 10:56 PM   #6
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Re: Can a clogged oil filter cause low oil pressure?

^^^^agreed....could be your oil pressure switch...the do go out from time to time..

has the engine ran any differently? what about the temperature?
Old 01-28-2008, 11:21 PM   #7
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Re: Can a clogged oil filter cause low oil pressure?

Well. i went with chevron 10w30 and a $7 bosch oil filter. I am trying to clean the system out.

So far i have put under 50 miles on the truck since I did the oil and LIM gasket, valve cover gaskets, new hoses (all of them)plugs wires air filter fresh coolant, pcv valve etc etc. I bought a case at costco for 20 bucks. I wanna run it another 50 miles, change it, do the same thing maybe a little more miles and then go back to what i have been using since i have owned the truck, 10w30 mobil BLENDED oil.

I live in phoenix so it RARELY gets remotely close to freezing, and it gets real hot outside, 100+ F. Engine temp is normal...just under 210? on the gauge.

OH, when i changed the oil filter i noticed it was much heavier than usual, so i poured out some of the sh*t in it and it was ugly, coagulated dex-cool and black oil. last oil change was about 4k. No noises no metal flakes on the drain plug. i even ran a larger magnet through the drained oil, found nothing.
Old 01-28-2008, 11:23 PM   #8
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Re: Can a clogged oil filter cause low oil pressure?

You found coolant in your oil? Am I understanding that correctly?
Old 01-28-2008, 11:26 PM   #9
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Re: Can a clogged oil filter cause low oil pressure?

id think a blockage would increase pressure. like pinching a hose. same volume smaller space principal.
Old 01-28-2008, 11:29 PM   #10
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Re: Can a clogged oil filter cause low oil pressure?

Yeah. LIM leaked for a while, finally got around to fixing it. (with all the credit to this site) actually there was a whole lot of coolant mixed in the oil, really weird, it sludged up under the valve covers and in the filter. like snot! i didnt see your typical water and oil separation. could have been cause of the dex cool and the high quality oil? the filter had clogged up real bad. i ended up cutting it open and it was the wierdiest thing i have ever seen.
Old 01-28-2008, 11:32 PM   #11
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Re: Can a clogged oil filter cause low oil pressure?

Quote: Originally Posted by ride and destroy
id think a blockage would increase pressure. like pinching a hose. same volume smaller space principal.
Yeah me too. this truck has the oil cooler lines too. any one know how the oil circulates through this engine? 1999 4.3L vin "x" 2wd 93k on it original owner.

And what about a clogged oil pump screen?
Old 01-28-2008, 11:35 PM   #12
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Re: Can a clogged oil filter cause low oil pressure?

Try running some trans fluid through the motor. Drain out a few qts then top back off with some ordinary Dextron III. Let the engine run untill it warms up, drain and replace filter and oil. Try a 5w30 weight, its what the motor was designed for, and you are in a warmer climate
Old 01-28-2008, 11:36 PM   #13
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Re: Can a clogged oil filter cause low oil pressure?

BTW, what is your oil pressure at idle and under throttle??
Old 01-29-2008, 04:04 AM   #14
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Re: Can a clogged oil filter cause low oil pressure?

well, according to the factory gauge, after extendeddriving....well past warm up...it will get as low as 25 30 in gear at idle (like at a light) while driving its around 45 to 50. until now it has always been 40-45 and 50-60. ill try the tranny fluid trick. i have read it on here and i like how it seems to be less "abrassive" than seafoam and engine flushes. ill keep updating. tranny fluid next.
Old 01-29-2008, 08:47 PM   #15
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Re: Can a clogged oil filter cause low oil pressure?

do the tranny fluid. it is less harsh and is less likely to clogg your pickup tube.
Old 01-29-2008, 09:08 PM   #16
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Re: Can a clogged oil filter cause low oil pressure?

Quote: Originally Posted by LC1
Yeah. LIM leaked for a while, finally got around to fixing it. (with all the credit to this site) actually there was a whole lot of coolant mixed in the oil, really weird, it sludged up under the valve covers and in the filter. like snot! i didnt see your typical water and oil separation. could have been cause of the dex cool and the high quality oil? the filter had clogged up real bad. i ended up cutting it open and it was the wierdiest thing i have ever seen.
You wont see the typical water in oil look with dexcool like you will the green stuff.
Old 01-29-2008, 09:32 PM   #17
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Re: Can a clogged oil filter cause low oil pressure?

i am about to change the oil again. just got home from work so ill tear into it after din. So the dex cool sludged up in the oil nice. i am guesung the filter clogged up twice now. if the oil pressure is read after the oil filter, than I can see the pressure reading low, by pass or not. What do you guys think? Also I am starting to wonder if the pick up tube is already clogged? Hmmm... after tonight i'll know if i'll have to dig deeper, remove the oil pan, and see whats up.

I forgot to mention.....after turning the truck off my gauge will drop to 20 and stay there. I can get it to reset to zero by turning the key to on (not starting it) then back to off. Here is the weird part... every time almost exactly after 30 seconds.... it will creep back up to 20 or 25!!! WTH??? This sounding more like an electrical issue? Possible sending unit?
Old 01-29-2008, 09:34 PM   #18
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Re: Can a clogged oil filter cause low oil pressure?

Quote: Originally Posted by S15vortecpwr
do the tranny fluid. it is less harsh and is less likely to clogg your pickup tube.
I agree. Will do.
Old 01-29-2008, 10:05 PM   #19
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Re: Can a clogged oil filter cause low oil pressure?

sensor is probably clogged up a bit
Old 01-30-2008, 02:05 PM   #20
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Re: Can a clogged oil filter cause low oil pressure?

Quote: Originally Posted by S15vortecpwr
sensor is probably clogged up a bit
the oil pressure sensor
does anyone know where its located? what it looks like?
i have a 02 4.3
Old 01-30-2008, 09:27 PM   #21
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Re: Can a clogged oil filter cause low oil pressure?

Its in these series of photos. its the elbow fitting with the wire harness attatched to it. The one at the back of the block, just to our right (or to the drivers side of) where the distributor would be. These photos dont show the dist. to get to it you will need to remove the distributor.

http://www.s10forum.com/forum/f107/r...w-pics-328484/
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