Gutless 4.6
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5th Wheeling
Joined: Aug 2007
Posts: 27
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Gutless 4.6
I just got a 99 f-150 single cab short bed 4.6 with a 5 speed manual and 4x4 truck is in great shape 1 owner 150k I have maintenance records since new very well taken care of. It has got to be the most gutless truck I have ever drove I was excited thought v8 5sp this thing would be fun to drive but I was wrong I'm not looking for a race truck or a lot of power but I think a geo metro might beat me in a race. No codes it sat for 2 years not being started but started right up I've put 5k on it in 1 1/2 months very reliable. I cleaned gas tank but it was already very clean changed fuel pump, fuel filter, installed high flow cats and a free flow muffler, spark plugs and wires, coil packs, air filter, fuel pressure regulator, cleaned mass air flow sensor, did air box mod nothing has helped getting 13-15mpg downshift on every hill or if wind blowing. Any ideas on what to do next? And if lugged at all it kinda chugs.
Lead Driver
Joined: Nov 2020
Posts: 7,128
Likes: 1,945
From: Sportsman's Paradise
Can't remember if that y/m and engine has the flat panel air filter or the round bullet shape, if it has the bullet shape, make sure the hard plastic nose is pointing away from the engine.
Hotshot
Joined: Jul 2020
Posts: 10,453
Likes: 2,630
From: Near Salt Lake City
The timing is digital and has no adjustment
The EGR should throw a code
The low flow ones that I have fixed (the 4.6 is notorious for code P0401)
Gain power, according to the owners
You would think low EGR flow would net more power
The port clogs up in the 4.6 intake elbow to the throttle plate
Good luck
The EGR should throw a code
The low flow ones that I have fixed (the 4.6 is notorious for code P0401)
Gain power, according to the owners
You would think low EGR flow would net more power
The port clogs up in the 4.6 intake elbow to the throttle plate
Good luck
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5th Wheeling
Joined: Aug 2007
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Thanks for the advise. With the timing I was thinking maybe something happened with the guides or tensioner but then I would probably hear some kind of noise in there
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Hotshot
Joined: Jul 2020
Posts: 10,453
Likes: 2,630
From: Near Salt Lake City
With 150k the timing chains might be getting loose
The guides might also be worn or broken
Those 4.6s are more forgiving than the 5.4s and you are right about the noise
IIRR you can check for a stretched chain and cam timing using the CMP hole in the left bank cylinder head
Make sure the spark plugs are Motorcraft
If you do go in the motor replacing timing components, use all Ford stuff and replace the tensioners too
You checked for codes right?
The guides might also be worn or broken
Those 4.6s are more forgiving than the 5.4s and you are right about the noise
IIRR you can check for a stretched chain and cam timing using the CMP hole in the left bank cylinder head
Make sure the spark plugs are Motorcraft
If you do go in the motor replacing timing components, use all Ford stuff and replace the tensioners too
You checked for codes right?
Cargo Master
Joined: Dec 2015
Posts: 2,913
Likes: 509
Our '03 4.6 had tons of pieces of timing chain guide in the pan at 150k. Not sure if it really affected performance, it's not driven hard at all.
The 4.6 doesn't do anything until 3500 or 4k. You've gotta make these OHC motors sing. If you don't have a tach get one.
The 4.6 doesn't do anything until 3500 or 4k. You've gotta make these OHC motors sing. If you don't have a tach get one.
Tuned
Joined: Dec 2012
Posts: 429
Likes: 112
The timing is digital and has no adjustment
The EGR should throw a code
The low flow ones that I have fixed (the 4.6 is notorious for code P0401)
Gain power, according to the owners
You would think low EGR flow would net more power
The port clogs up in the 4.6 intake elbow to the throttle plate
Good luck
The EGR should throw a code
The low flow ones that I have fixed (the 4.6 is notorious for code P0401)
Gain power, according to the owners
You would think low EGR flow would net more power
The port clogs up in the 4.6 intake elbow to the throttle plate
Good luck
Grand marquis had that engine with 2.73 gearing :lol:. No power but on a flat highway can hit 30mpg.
Moderator
Joined: May 2004
Posts: 6,517
Likes: 917
From: Home Base Nebraska
I just got a 99 f-150 single cab short bed 4.6 with a 5 speed manual and 4x4 truck is in great shape 1 owner 150k I have maintenance records since new very well taken care of. It has got to be the most gutless truck I have ever drove I was excited thought v8 5sp this thing would be fun to drive but I was wrong I'm not looking for a race truck or a lot of power but I think a geo metro might beat me in a race. No codes it sat for 2 years not being started but started right up I've put 5k on it in 1 1/2 months very reliable. I cleaned gas tank but it was already very clean changed fuel pump, fuel filter, installed high flow cats and a free flow muffler, spark plugs and wires, coil packs, air filter, fuel pressure regulator, cleaned mass air flow sensor, did air box mod nothing has helped getting 13-15mpg downshift on every hill or if wind blowing. Any ideas on what to do next? And if lugged at all it kinda chugs.
Denny
Thread Starter
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5th Wheeling
Joined: Aug 2007
Posts: 27
Likes: 0
I still think something is wrong with the truck but I tried running the rpms higher and don't use 5th gear unless cruising 75,80 on flats and seems a little better. My everyday driver before this I still have is a diesel so I wasn't used to the higher rpm thing.
Cargo Master
Joined: Dec 2015
Posts: 2,913
Likes: 509
All the modular OHC motors need to spin. They're like the antithesis of diesel. But unlike older pushrod motors they're perfectly happy to hang out close to redline indefinitely.