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Old November 29th, 2010, 06:50 PM   #1
cclev1967
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Default question about oil pressure

i have a93 f150 2 wheel drive, i know i know but it was free, anyway, my father in law gave me the truck he was the original owner, the truck only has 52,000 miles on it. i decided to put some new tires on it and start driving it. the truck has sat at my house with only being started for about 10 minutes a week for the past 2 months.

today i go to drive it to town to tires put on it, and i look down and no oil pressure, temp gauge looks fine, i pull over and shut truck off, check oil its good, so i start the truck and go into town, i get on highway going 75 it reads normal, get speed down to below 60 or at idle, and pressure drops to nothing,

i noticed sitting at a light it now has a slight ticking noise i never noticed before.
i dont want this thing to blow up so do i change oil pump, take out screen and tube and change it or clean it, or what. i got a haynes manual i believe i can do all this myself, sounds doable for me anyway.

just thought id get some advice, tips, tricks, or anything i can from you guys.

thanks in advance
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Old November 29th, 2010, 06:58 PM   #2
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Buy a oil pressure sender first and replace it. Or get a mechanical gauge for it to verify.
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Old November 29th, 2010, 07:06 PM   #3
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Ford V8's are famous for running with no oil pressure, my brother had one that ran for years with no oil pressure.
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Old November 29th, 2010, 09:10 PM   #4
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forgot to mention also its a 4.9 inline 6,
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Old November 29th, 2010, 09:14 PM   #5
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Shit 300's run forever anyways.
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Old November 29th, 2010, 09:18 PM   #6
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well thats what im hoping for, i really like the truck even though its a 2 wheel drive. i just dont want to blow the thing up with 52,000 miles on it, and since im not a mechanic figured this was the best place to go for the free advice, ive seen some of the rigs you guys build and all i can ever say is wow wish i could do that. lol
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Old November 29th, 2010, 09:20 PM   #7
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Get a cheap $20 mechanical gauge and see what the pressure truely is. Best place to start.
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Old November 29th, 2010, 09:23 PM   #8
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will do that first thing in morning,
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Old November 30th, 2010, 12:52 PM   #9
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Quote:
Originally Posted by dougstephvoor View Post
Ford V8's are famous for running with no oil pressure, my brother had one that ran for years with no oil pressure.
Its not that the engine didn't have oil pressure, its because the gauge stopped working. All older Ford trucks (mostly 90's) are known to have faulty oil pressure gauges and oil pumps. The same thing happend with my 94 F150 with the 351 V8 and before I knew it the motor was toast. I've owned about 5 of the 90's Fords with the 4.9, 5.0, and 351 myself and every one of them always had an issue with the oil pump / gauge. Get a manual gauge and check it ASAP! They are very easy to hook up, just unscrew the oil sensor from the side of the block with a special socket (you can get at any auto parts store cheap) and screw in the connector for the manual gauge. You could also have a clogged oil filter so make sure you check that too.

Last edited by chevyk10; November 30th, 2010 at 01:00 PM.
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Old November 30th, 2010, 01:07 PM   #10
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update: i out in a manual gauge, still no pressure reading, i changed the oil and filter yesterday and put in synthetic oil, so ive got a buddy that owns a shop and hes going to change out the oil pump and screen with new. hopefully that will take care of it. hes working on it as i write this. thanks guys for all the advice.
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Old November 30th, 2010, 01:27 PM   #11
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update: i out in a manual gauge, still no pressure reading, i changed the oil and filter yesterday and put in synthetic oil, so ive got a buddy that owns a shop and hes going to change out the oil pump and screen with new. hopefully that will take care of it. hes working on it as i write this. thanks guys for all the advice.
Glad you caught it in time. The oil pumps like to seize up when dirt gets in them. Good luck.
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Old November 30th, 2010, 01:34 PM   #12
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yeah i dont think any real damage occurred so i should be alright, ill let ya all know how it turns and if its fixed witht he new pump
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Old December 1st, 2010, 07:04 AM   #13
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put in a new oil pump last night, i have decent pressure when going down the road, but it drops to next to nothing when sitting at a light or going really slow, im thinking i probably didnt get it in time and did some damage to the bearings, so i guess it means im now looking for another 300 6 cyl motor. ill drive this one till she dies, sucks because this motor only has 52,000 miles on it. and hey thanks agian guys for all the help, thats why i love this site.
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Old December 1st, 2010, 07:33 AM   #14
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Slipbit in nuetral @ stops and keep the pressure up. My in-laws have been nursing a 00 xj 4.0 for about a year now with only 4psi oil pressure @ idle warm. Been doing oil changes every 1500 with bottle lucas and 20/50 all summer. Don't wanna know what the inside of that motor looks like they only have 110k on theres. But they went like 19k betwween an oil change and that was the result.
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Old December 1st, 2010, 08:48 AM   #15
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Quote:
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Slipbit in nuetral @ stops and keep the pressure up. My in-laws have been nursing a 00 xj 4.0 for about a year now with only 4psi oil pressure @ idle warm. Been doing oil changes every 1500 with bottle lucas and 20/50 all summer. Don't wanna know what the inside of that motor looks like they only have 110k on theres. But they went like 19k betwween an oil change and that was the result.
That motors fucked!
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Old December 2nd, 2010, 09:11 AM   #16
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Those 300's run forever, Personally i wouldnt even worry about it. Just drive it. Especially if you have a replaced the pickup and pump.

A buddy of mine (member on here) had one that ran 5psi on the freeway and he drove the snot out of it.

I got 5 bucks says the body rots off before that motor needs to be pulled
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Old December 2nd, 2010, 04:54 PM   #17
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Quote:
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Those 300's run forever, Personally i wouldnt even worry about it. Just drive it. Especially if you have a replaced the pickup and pump.

A buddy of mine (member on here) had one that ran 5psi on the freeway and he drove the snot out of it.

I got 5 bucks says the body rots off before that motor needs to be pulled
If you still hear the ratteling like you metioned before then the engine is most likely toast. It really only takes about 5 - 10 minutes of driving to do serious damage. But I did however have an 89 F-250 (truck in my avatar) with the straight 6 and the oil pressure dropped pretty low at idle, then still didn't go too much higher when I drove it. I had it for a few months and never had any problems. I'd say just keep driving it.
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Old December 2nd, 2010, 05:42 PM   #18
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Quote:
Originally Posted by Quiefinator View Post
Those 300's run forever, Personally i wouldnt even worry about it. Just drive it. Especially if you have a replaced the pickup and pump.

A buddy of mine (member on here) had one that ran 5psi on the freeway and he drove the snot out of it.

I got 5 bucks says the body rots off before that motor needs to be pulled
And I always take advice from a guy named Quiefinator.

Put some thicker oil in it and drive it, but you might want to get AAA towing, unless you have a buddy with a tow truck.
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Old December 2nd, 2010, 05:51 PM   #19
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And I always take advice from a guy named Quiefinator.

Put some thicker oil in it and drive it, but you might want to get AAA towing, unless you have a buddy with a tow truck.


x2.
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Old December 2nd, 2010, 06:48 PM   #20
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That motors fucked!
Yep

Been driving on it daily almost a year now

unfort. the 97+ 4.0L used are gold apparently.
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