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1990 5.8, 74000 miles well maintained. Oil preasure drops off

Not the sending unit ,it does loose the presure ,you can hear the lifters, fresh 1040 oil and filter every 300 miles. new oil pump 14 months ago. Shut off the truck, waite a minute ir two, restartand have presure for a short time

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Why are you running 10 - 40 weight oil. You might want to rethink this. As the miles go up the ware on parts goes up. So I would recommend a 5 - 20 or 5 - 30 high mileage oil. If the oil pump is that new and working properly then this will help with the pressure.

Posted on Nov 27, 2013

  • Brad Beers
    Brad Beers Nov 27, 2013

    Thank you for the advise, I will put some 5-30 and new gold filter tomarow. It was also sugested to put in some sea foam and run it with my existing oil first,and then put in the new oil?? do you think this is a wise idea?

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: oil presure sending unit

Cadillac 1994 DeVille

Check, if the oil level is low, top off.
If the oil level was ok then you can replace the oil sending unit.

Posted on May 13, 2009

localwonder
  • 6784 Answers

SOURCE: truck stalls while driving, will start again if wait ten minutes

Ok, this sounds like a weak fuel pump and clogged filter. if possible, you will need to change these two vital devices. I would also replace the air filter as well.

Inspect the injection system for faults as well. make sure all injectors are firing properly and on time. replace any injector that isn't functioning correctly.

Posted on May 29, 2009

  • 116 Answers

SOURCE: Oil pressure fluctuates after 15 minutes of

Could be some debris in the oil pickup screen (can access it if you remove the oilpan) Or worse case scenario is your bearing is starting to fail...which is a BIG job (Removing the engine to repair it) 30 psi is the bare minimum for your engine to run safely without damage...so i see why your very concerned.
I hope its just a little "Gunk" on the screen. If it is i would consider putting some Seafoam (1/2 a can) into the engine oil and drive around like you normally would for a couple of days and then change the oil (Its a great product for breaking up "Gunk" in the oil or gas line.)
I hope this helps you out 8-)

Posted on Jun 07, 2009

  • 2841 Answers

SOURCE: lifter ticking

You may have a dirty lifter with varnish buildup. Try this as it may very well solve the problem. Purchase a can of Seafoam Motor Treatment. Add 1.5 oz of Seafoam for each quart of oil capacity. 4.5 Quarts = 6.75 oz Seafoam. Drive the car until you no longer hear the lifter and then have the oil/filter changed again. Next oil change use a quality filter such as Wix, Mopar, or Purolator. You can purchase Seafoam at almost any auto parts or marine store and at some Walmart stores. Here is their website. http://www.seafoamsales.com/

Posted on Apr 07, 2010

  • 6982 Answers

SOURCE: 2001 jeep grand cherokee. no leaks losing coolant,

Most serious item I see is oil pressure. Put a mechanical gauge on the engine and get an accurate reading. Also make sure that the passage to the sender isn't blocked. If you did the pump yourself, did you find any coolant in the oil? In 99% of all low oil pressure situations, the oil pump has not failed. Rather, either a cam bearing or crank/rod bearing is worn. You do not have to have one spun or completely worn out bearing. Even wear of all bearings that is somewhat excessive can bleed off enough pressure to cause problems (plastigage the engine bearings to determine wear).
As far as coolant loss. A cylinder head gasket can fail between cylinders, into a water passage, into an oil passage or any combination of those and externally as well. The cylinder heads on engines beginning in about '98 are prone to "micro-cracking" which can lead to all kinds of hard to diagnose coolant loss problems. It may help if you have a shop do a dye test and a hydrocarbon test on the cooling system and see what they find.
I have seen several kinds of block sealing systems available. Though I generally do not recommend them, as the longevity of the repair isn't predictable, you could try that as a option of last resort.
There is no quick easy solution to your problem but with a bit of "poking around" you may be able to cure it. Don't bother repairing one problem before finding out what the other one is first though as together, it might be smarter to replace the engine.

Posted on May 09, 2010

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what would be the point of oil change if your just going to use old oil
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change the filter out in tank these get debry clogs from bad cheap gas
this you need to drop tank pull out sending unit with filter and replace most people dont realize this at all that the inside tank has to be serviced on a routine schedule every hundred thousand miles this will keep flow good

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