1995 4.9 started knocking - I need your help!!!
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5th Wheeling
Joined: May 2019
Posts: 27
Likes: 3
1995 4.9 started knocking - I need your help!!!
Hey all,
I've been reading through here for a couple years now - never had any major issues with my trucks. I picked up a 95 f150 4.9 with 93,000miles on it about 3 months ago and it has just started, or I have just noticed that it knocks at low revs.
It seems to be worse when its warm, after driving for 20+ minutes. Its not all the time and it seems to be worst when I'm driving slowly through traffic or parking lots. It knocks and goes away when I get up to speed.
I am worried that it might be rod-knock - but I'm hoping you guys can take a listen and tell me what you think. I'm hoping its something like a stuck rocker or spark knock - but I really don't know. I just added some octane to the tank before taking this video.
Check out the youtube video
I've been reading through here for a couple years now - never had any major issues with my trucks. I picked up a 95 f150 4.9 with 93,000miles on it about 3 months ago and it has just started, or I have just noticed that it knocks at low revs.
It seems to be worse when its warm, after driving for 20+ minutes. Its not all the time and it seems to be worst when I'm driving slowly through traffic or parking lots. It knocks and goes away when I get up to speed.
I am worried that it might be rod-knock - but I'm hoping you guys can take a listen and tell me what you think. I'm hoping its something like a stuck rocker or spark knock - but I really don't know. I just added some octane to the tank before taking this video.
Check out the youtube video
Elder User
Joined: Sep 2018
Posts: 735
Likes: 8
From: NC
sounds like rod knock/ lifter tick. Octane aint gonna help that. Run a pint or so of marvel mystery oil in the crank case for a hundred or so miles, see if it clears it up. if it does, good. Drop the oil and do an oil change. if it doesn't you are out about 4 bucks for the quart of MMO. Or dump a quart in it before you do an oil change and run it for 30 min.
MMO is a safe gentle cleaner, been around for almost a hundred years and it is not as harsh as Seafoam or other stuff used for cleaning internals. I have been using it for 30 years and it has cleared up lifter tick on a few cars i have owned.
MMO is a safe gentle cleaner, been around for almost a hundred years and it is not as harsh as Seafoam or other stuff used for cleaning internals. I have been using it for 30 years and it has cleared up lifter tick on a few cars i have owned.
Thread Starter
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5th Wheeling
Joined: May 2019
Posts: 27
Likes: 3
I just did an oil change last week, using a Wix filter and just regular 10w30 by Pennzoil.
I’ll drop a quart of it out this morning and add some MMO and see how she does.
im not seeing a ton of oil moving when I remove the oil cap, is that normal on these trucks? I lifted the wife’s oil cap and oil was splashing around in her Toyota.
I’ll drop a quart of it out this morning and add some MMO and see how she does.
im not seeing a ton of oil moving when I remove the oil cap, is that normal on these trucks? I lifted the wife’s oil cap and oil was splashing around in her Toyota.
Elder User
Joined: Sep 2018
Posts: 735
Likes: 8
From: NC
I just did an oil change last week, using a Wix filter and just regular 10w30 by Pennzoil.
I’ll drop a quart of it out this morning and add some MMO and see how she does.
im not seeing a ton of oil moving when I remove the oil cap, is that normal on these trucks? I lifted the wife’s oil cap and oil was splashing around in her Toyota.
I’ll drop a quart of it out this morning and add some MMO and see how she does.
im not seeing a ton of oil moving when I remove the oil cap, is that normal on these trucks? I lifted the wife’s oil cap and oil was splashing around in her Toyota.
My Toyota 22R in my 88 toyota truck used to sling oil like there was no tomorrow in the valve cover.
Either way, let us know how it turns out and if it is a negative,we can try further figuring out what to do.
Thread Starter
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5th Wheeling
Joined: May 2019
Posts: 27
Likes: 3
Thanks for the responses. Yeah I agree that intermittent tapping is a sticky lifter after listing more to the idle. I’ve got the MMO in there now brewing for a couple hundred more miles.
My bigger concern is that when I’m driving at low speeds, usually with a constant RPM I get a distinct knock, not a ping or a tap, you can hear it at the end of my video somewhat when I put the camera under the oil pan. This only comes up when it’s warm after driving for about 20 minutes.
Oil pressure on the dash gauge looks okay, but I know that’s probably not a good gauge to use.
Are there any other ways to find out for sure if I have a rod knock? Other than dropping the pan?
Thanks guys. This damn problem is depressing. I love this truck!
My bigger concern is that when I’m driving at low speeds, usually with a constant RPM I get a distinct knock, not a ping or a tap, you can hear it at the end of my video somewhat when I put the camera under the oil pan. This only comes up when it’s warm after driving for about 20 minutes.
Oil pressure on the dash gauge looks okay, but I know that’s probably not a good gauge to use.
Are there any other ways to find out for sure if I have a rod knock? Other than dropping the pan?
Thanks guys. This damn problem is depressing. I love this truck!
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Logistics Pro
Joined: Mar 2005
Posts: 4,698
Likes: 47
From: Mexico, Missouri
If It were a rod knock, then when you change the oil, there should metal glistening in the oil. A rod knock will be distinct shortly after the engine is running.
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Lead Driver
Joined: Jan 2019
Posts: 5,075
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From: N.W. Alabama
if you had a long screwdriver, or 2'-3' piece of 3/8 hose, you could put one end to your ear and other on valve cover, and see if you can pin point sound, and help decide if pulling valve cover, and looking where sound was the loudest, at those or that rocker arm, was sound louder on top or when you was recording bottom of oil pan at 1:31 mark,
Elder User
Joined: Sep 2012
Posts: 505
Likes: 7
I don't think it sounds like rod knock.
The knocking at constant RPM / slow speed (I'm guessing it happens at light-throttle near 2000 RPM?) might be spark knock. Check your timing. My truck does it if the base timing is more than a few degrees advanced. I can't set it to the stock 10* advanced because of the spark knock... I run it around 5* advanced.
The knocking at constant RPM / slow speed (I'm guessing it happens at light-throttle near 2000 RPM?) might be spark knock. Check your timing. My truck does it if the base timing is more than a few degrees advanced. I can't set it to the stock 10* advanced because of the spark knock... I run it around 5* advanced.
Thread Starter
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5th Wheeling
Joined: May 2019
Posts: 27
Likes: 3
I really hope its as simple as adjusting the timing - I'll be honest though, I've never worked with distributers before so I'm pretty lost. I don't have a strobe so my plan was to turn it a couple degrees one way, go for a drive, turn it slightly the other, and see if I can still hear the knock. The problem is, I cant find the set screw that holds the distributer in place - and tips on how to turn this thing?
Hows that for a plan?
I need to get my hands on a Haynes manual..
Hows that for a plan?
I need to get my hands on a Haynes manual..
Lead Driver
Joined: Jan 2019
Posts: 5,075
Likes: 864
From: N.W. Alabama
once you find it, wipe it off and mark it so you have a start point, to go from, if you cant barrow a buddies timing light, say if you move it 1/8" left(clockwise) from start mark, drive see change, go back to start mark, go right(counter-clockwise) 1/8", 1/8" is about 3*-4* of timing change in each direction, from start mark
Thread Starter
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5th Wheeling
Joined: May 2019
Posts: 27
Likes: 3
Okay so I worked on the distributor for a while here. Thanks for the tips on how to adjust it.
I went at the max about 5* advance and retarded and the knocking remained, but sounding worse at different RPM’s.
I just took another video of it knocking while going up my crazy driveway. It must be rod if not the spark?
I went at the max about 5* advance and retarded and the knocking remained, but sounding worse at different RPM’s.
I just took another video of it knocking while going up my crazy driveway. It must be rod if not the spark?