4.2 v6 engine
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1st Gear
Joined: Oct 2023
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4.2 v6 engine
Hello I currently own a 2001 f-150 with a 4.2L V6. It has 250k miles on it and is giving issues like shaking when accelerating. I’ve come to the conclusion that replacing the motor is what I need to do. I wanted to ask if it would be possible to put a V8 instead of a V6? If it is not possible, what would be the best solution?
Fleet Mechanic
Joined: Jul 2019
Posts: 1,316
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Pull the spark plugs and show us some pictures. With some miles on them, 4.2s like to burn oil and foul spark plugs.
That mileage is a pretty good run for a 4.2. If the truck works fine, I’d just find another 4.2 to throw in.
A v8 would require the transmission and computer, for starters.
That mileage is a pretty good run for a 4.2. If the truck works fine, I’d just find another 4.2 to throw in.
A v8 would require the transmission and computer, for starters.
5th Wheeling
Joined: Mar 2020
Posts: 49
Likes: 5
I have a 2004 Heritage 4.2 with 290,000 miles. The plugs can definitely cause shaking on acceleration and will foul sooner than you think. I would strongly recommend you change the basics, plugs, air filter, gas filter, coil pack and wires.You have very little to lose. I'll bet the 4.2 will run fine.
4wd Low
Joined: Jan 2023
Posts: 11
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From: Cibolo, TX
How about swapping to a newer, later model EcoBoost V6
If swapping to a V8 is too expensive or too much trouble, would the same thing apply to swapping a newer, later model EcoBoost V6 engine, be possible and easy, or is a bolt on turbo system available for the 4.2? I have a 2003 F-150 supercab stepside pickup with just under 197,000 original miles with the 4.2, automatic trans, 3.55 rear axle. It runs like it was just broken in with low mileage. It doesn't use any oil in between oil changes. The only thing the engine has had replaced since new was the rear main seal and normal routine maintenance items (belts and hoses). It runs like a top, although a slow top, when compared to a 75 Ford F-100 that I swapped a 428 PI engine in, decades ago. I long for the feeling I got when the G forces pushed me against the seat back when floored. No, I'm not a 'youngster'; I'm 75 years young.
Last edited by modeltwoods; Nov 4, 2023 at 03:48 PM. Reason: left out word
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If swapping to a V8 is too expensive or too much trouble, would the same thing apply to swapping a newer, later model EcoBoost V6 engine, be possible and easy, or is a bolt on turbo system available for the 4.2? I have a 2003 F-150 supercab stepside pickup with just under 197,000 original miles with the 4.2, automatic trans, 3.55 rear axle. It runs like it was just broken in with low mileage. It doesn't use any oil in between oil changes. The only thing the engine has had replaced since new was the rear main seal and normal routine maintenance items (belts and hoses). It runs like a top, although a slow top, when compared to a 75 Ford F-100 that I swapped a 428 PI engine in, decades ago. I long for the feeling I got when the G forces pushed me against the seat back when floored. No, I'm not a 'youngster'; I'm 75 years young.
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