99 navi engine knock at startup
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99 navi engine knock at startup
My 99 Nai Just Reached 100,000 All Maintenance Done On Time, I Just Got An Oil Change And Now When I Start Up I Hear A Little Knocking For A Few Seconds And More When I Lay Down On The Pedal, Oil Level Is Good. Any Help Would Be Appreciated
Post Fiend
Joined: Mar 2003
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From: Sarnia, Ontario, CANADA!
Hi and welcome to FTE! Be sure to read this to help you around this site: https://www.ford-trucks.com/forums/s...88#post3272088 There are also State, Provincial and International Chapters located near the bottom of the main forum page.
We are glad to have you. Hope you enjoy the site. Check out the various forums. Lots of great info for you.
Thread moved to Oil & Lubrication forum.
See ya on the boards!
-Matt
We are glad to have you. Hope you enjoy the site. Check out the various forums. Lots of great info for you.
Thread moved to Oil & Lubrication forum.
See ya on the boards!
-Matt
Moderator
Joined: Jan 2004
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From: SW Va
Welcome to FTE kbomber.
Well what changed during the oil change???? I take it that the engine wasn't knocking beforehand, right????
If so, that leaves us looking at the filter & the weight oil used.
Was it the specified Motorcraft filter, or some other aftermarket brand????
If it's a aftermarket brand, does it meet or exceed Fords specifications & is it constructed internally the same????
Was the specified weight lube used for the weather your expecting during this oil change intervial & does it meet or exceed Fords specfications????
Is it the same brand & weight you've been using without knocking problems????? If so, I'd suspct a filter problem & would return for a replacement filter & makeup qt of oil.
Well what changed during the oil change???? I take it that the engine wasn't knocking beforehand, right????
If so, that leaves us looking at the filter & the weight oil used.
Was it the specified Motorcraft filter, or some other aftermarket brand????
If it's a aftermarket brand, does it meet or exceed Fords specifications & is it constructed internally the same????
Was the specified weight lube used for the weather your expecting during this oil change intervial & does it meet or exceed Fords specfications????
Is it the same brand & weight you've been using without knocking problems????? If so, I'd suspct a filter problem & would return for a replacement filter & makeup qt of oil.
Posting Guru
Joined: Jul 2001
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Your oil filter has an anti-drain back valve that keeps the filter full of oil so that at startup, the oil is already in the filter and the system can pressurize quicker. It sounds like your filter has a leaking valve. It allows the oil to flow back into the pan and at startup, the system has to pressurize the filter first and then oil gets to the parts. It's similiar to starting the engine after every oil change in that you have to wait for the oil pressure to build before the engine gets quiet. I would replace the filter with a brand name, preferably not orange, and that should solve the problem.
Posting Guru
Joined: Jun 1999
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From: Northern California
I concur with PawPaw & Flash's response. If you had the oil changed at a shop, I would return the Navigator, telling them the concerns you just stated. This way, you'll be protected for any future engine problems, oil related. If they say nothing is wrong, then have them state that in writing. The sooner the better, (mileage) since the oil was changed. If they do nothing, and you have this in writing, then I would change the oil filter with the correct Motorcraft part. Lastly, with this being the middle of winter, what weight / viscosity of oil was put in your vehicle? PawPaw concern is also mine... Ed
Elder User
Joined: Nov 2005
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I suspect that the rod bearings are getting a bit worn and knock a bit before the oil presure builds up. Use 10w30 instead if you are using 5w20 or 5w30 and that will help in a a looser engine.
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Elder User
Joined: Jan 2004
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From: Bobcaygeon Ont.
Are the orange filters realy that bad!? Not trying to start anything just curious. Thats what i've been using but i should think about changing maybe!? 
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Which engine you got?? 4.6 or 5.4?? If it is a 5.4 you could have the beginnings of a little piston slap. If that is what it is there is no real harm just an annoying noise for a minute or two at start up until the engine warms up. Especially so in the cooler months. I have a 97 F-150 with the piston slap which started at about 85,000 miles. I have almost 150,000 miles now and no problems other than the noise. I have found no magical oil or additive that cures it so I just live with it. I would much rather think it is piston slap rather than a rod knock if the engine has had been reasonably maintained.
Post Fiend
Joined: Mar 2003
Posts: 14,413
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From: Sarnia, Ontario, CANADA!
Originally Posted by lancer
Are the orange filters realy that bad!? Not trying to start anything just curious. Thats what i've been using but i should think about changing maybe!?
-Matt
