Question about Cars & Trucks

1 Answer

I have a 1990 f350 w/ a 460. It runs great with 105000. It has oil pressure issues at idle and start. I have a manual gauge on it now. It has good pressure in operation. What could be the problem? I put thinner oil in it also, no change. It don't want to ruin the motor.

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.


    An expert that got 20 achievements.


    An expert that got 10 achievements.

  • Cars & Trucks Master
  • 42,218 Answers

Probable worn hydraulic cam followers/lifters . They have a specific leak down time and if badly worn then the pump may not keep up the pressure at idle. Alsao there may be a problem with the pressure relief valve in the oil pump system

Posted on Jan 23, 2013

6 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

  • 13 Answers

SOURCE: 1999 Chevy Blazer - idle fluctuates

oil pump might be going bad

Posted on Aug 03, 2009

  • 672 Answers

SOURCE: I have a 1990 camry. Starts good, idles OK, can

check your IAC valve, it may be sticking/stuck. hopefully this helps

Posted on Aug 12, 2009

  • 12104 Answers

SOURCE: oil light on no pressure gauge sounds like now

ur diesel engine is ur rockers and push rods /valves and lifters metal on metal no oil lubing parts--real bad --sounds like an oil pump problem if level is good-- would require to have scanned for trouble code it would narrow down trouble but driving will most likely cause more engine damage need to have mech or dealer inspect and scan problem and its advised to have it towed where ever u pick

Posted on Oct 14, 2009

  • 114 Answers

SOURCE: I have recently purchased a 1997 Toyota

Unless you are in a cold part of the country, I'd suggest 10W40 or even 20W50 and see if the oil pressure improves. Mobil 1 will often yield lower oil pressure in higher mileage engines when hot. It's really not worth the money unless you live in near arctic conditions.

Posted on Dec 20, 2009

  • 274 Answers

SOURCE: Low oil pressure at idle, up tp 20psi under

You could have a blocked or broken oil pickup inside the sump or a broken spring in relief valve Think relief valve is on pump on those but not sure I'd be looking hard at pickup in sump

Posted on Jan 27, 2010

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Has 358000 miles, just had leaks repaired. Twice since my oil pressure gauge reads no pressure but not all the time? Why

1. Oil Pressure Gauge Not Working You will notice this happens when your oil pressure gauge is not reading, whether the engine is turned off, idle or running. Try to step on the gas to rev up the engine. If the oil pressure gauge still doesn't change its reading, your gauge is busted. It's best to replace it as soon as possible because you won't have any idea if your car is already overheating or not.
2. Oil Pressure Gauge Reading Too Low When your engine is idle, the oil pressure gauge will have a low reading. When the engine starts running or when you're already cruising or on the freeway, your gauge's reading should have increased. If it stays on a low reading, then you now your oil pressure gauge is broken.
3. Oil Pressure Gauge Reading Too High Another common oil pressure gauge problem is when your oil pressure gauge is reading too high when your engine is idle or when it's turned off. Rep

Oct 24, 2015 | 2001 GMC Yukon XL

1 Answer

P2285 code 6.0 litre ford deisel long cranking before starting after starts runs great but oil pressure gauge drops at idle

bad bearings on crank or worn oil pump. Pressure will be up when cold, but will drop when engine warms up. Check for knock in lower end. If so, bad crank bearings.

Jan 16, 2013 | 2004 Ford Super Duty F 550

1 Answer

2002 cherokee 4.7L. -bad oil pressure sensor... changed -now when eng revs up or is under load the oil pres. gauge goes down rapidly -when load is off eng or revs at idle the oil pres. on guage returns to...

you need to have someone with a reader hook up to your jeep and clear the codes. even though you replaced the sensor your computer thinks it is still running on a faulty sensor

Mar 31, 2017 | 2002 Jeep Grand Cherokee

1 Answer

I have a 91 chevy, 2wd with a 350. My oil pressure gauge reads 0 at idle and goes up to 30 when I get on it. Truck runs great no pings or knocks. Took off the valve cover, usually oil just trickles out of...

Sounds like you have good pressure but would not hurt to put a mechanical gauge on it to verify that. Chances are that the sending unit is going bad or a passageway to it is obstructed. If pressure is good, change the sender and put some marvel oil in there to clean up the residue.

Feb 02, 2010 | 1991 Chevrolet C1500

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

Won't start

ford electrical.......good luck. Just want to say that many times when this happens, it is the spark modulator on the distributor. This can be tested before you buy a new one. You take it off and up to auto parts place. Autozone will work great for this.

Oct 12, 2008 | 1990 Ford F150

2 Answers

Mercedes 190e

in 190d ,engine 2.0.l diesel this thing is lokated near oil filter.

Aug 23, 2008 | 1990 Mercedes-Benz 190

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

24 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cars & Trucks Experts


Level 3 Expert

75824 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Randy Ohler

Level 3 Expert

14585 Answers

Are you a Car and Truck Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides