Question about 1990 Ford F150

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Oil pressure drops when idling

It drops when its idling and also when i push the gas to go it knocks/shakes a little bit

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  • 202 Answers

Check if oil filter is not clogged

Posted on Jul 24, 2009

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99 alero 3.4 blew the head gasket, intake gasket and water pump. Changed all of it. Rough start and high idle now. What could cause the oil light to stay on with the engine knocking and shaking?


More bad news. Have the oil pressure checked. Did any coolant get in the oil? Did it run like that for some time? Knocking and shaking is bad news-check it out carefully.

Feb 17, 2016 | Cars & Trucks

1 Answer

Engine knock hard over 2500 rpm


Does the oil light come on or the knock occur during the engine warm up after a cold start?
There could be a couple of problems causing the issue. You could have an oil pressure pump or pump pressure regulator sticking. I would have a mechanical oil pressure gauge installed and verify oil pressure at idle and 2500 rpms to make sure oil pressure is in normal ranges.
You could also have excessive piston rod bearing, crankshaft bearing or cam shaft bearing wear that will cause oil pressure to drop too low to prevent the rod knock your hearing at 2500 rpm.
You said a knock and not a ticking noise,so I don't believe a lifter is the issue at 2500 rpm.
Start with the oil pressure check and go from there.
Let me know.
Regards,

Aug 22, 2009 | 1996 Dodge Stratus

1 Answer

Oil pressure dropping at idle now its tapping!!


you are going to have to drop the engine oil pan and replace the oil pump.

Jul 20, 2009 | 2001 Jeep Cherokee

2 Answers

Oil pressure drops when idling and knock from main bearing.


How many miles on it? Could be the oil pump if the oil level is full.

Jul 08, 2009 | 1990 Ford F150

1 Answer

Low oil pressure when engine is under load.


What you describe is signs of a failing oil pump. As the pump gets more and more out of spec the more it will act this way. If the pressure is dropping to the point of knocking plan to install and oil pump in the motor before too long.

Jun 07, 2009 | 1989 Ford Bronco

1 Answer

Oil pressure drops to 0 at idle


OOO not good sounds like some of the head gasket got stuck somewhere, or the gauge or sender is bad or got knocked around when repairing the head gasket. I would check that first. If that checks out will need to drop the pan to see if something got stuck in the pickup tube,might as well change the pump while you are there. Or worst case some thing wrong with gasket job impeading oil flow back to bottom of the engine. Was the oil and filter changed ?if so pull out filter and see if an chunks are stuck in it now. And change oil and filter again. Sorry that was out of order I had a long day

Apr 16, 2009 | 1996 Chevrolet Tahoe

1 Answer

Engine knock...


Oil pressure might actually be a bit high for idle. High or low oil pressure in an older engine tends to be indicative of some serious issues. Oil pressure that is too high tends to be a clue that you have serious carbon build up. That aside, have you tried running a higher octane fuel, or perhaps adding an octane booster to your normal grade? Pinging can become knocking in a badly worn engine. One recommendation: At your next oil change try substituting a quart of marvel mystery oil or lucas engine oil treatment in place of one quart of your normal oil. Both have some pretty good track records for helping to free up sticking valves and break up carbon in older engines. I'm an old timer myself, and I personally swear by Marvel for older engines. There is no "rebuild in a can" but Marvel comes close. Give those a shot, let me know what happens.

Feb 06, 2009 | 1990 Ford Bronco

1 Answer

Engine knock when going uphill +...


Oil pressure might actually be a bit high for idle. High or low oil pressure in an older engine tends to be indicative of some serious issues. Oil pressure that is too high tends to be a clue that you have serious carbon build up. That aside, have you tried running a higher octane fuel, or perhaps adding an octane booster to your normal grade? Pinging can become knocking in a badly worn engine. One recommendation: At your next oil change try substituting a quart of marvel mystery oil or lucas engine oil treatment in place of one quart of your normal oil. Both have some pretty good track records for helping to free up sticking valves and break up carbon in older engines. I'm an old timer myself, and I personally swear by Marvel for older engines. There is no "rebuild in a can" but Marvel comes close. Give those a shot, let me know what happens.

Feb 06, 2009 | 1992 Buick LeSabre

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