05 f150
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05 f150
Hey guys, I have an 05 F150 with a 4.2L v6, 5 speed manual. Wound it out the other day, when it hit 5000rpm, it felt like it went to neutral and was no longer powering the truck, so my question is: what the hell?
Fleet Mechanic
Joined: Apr 2014
Posts: 1,512
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From: Pittsburgh, PA
How is it running since then? When you came back down from that high rpm, how did it run? Did it throw a check engine light or anything at you? I wonder if you hit a governor or something that Ford programmed into the PCM to make sure people don't blow it up by over-revving it?
I also have the V6 5-speed, and I don't think my truck has ever seen 5000 in its life. I have the 3.55 gear, and it's not really a high revving engine. This 4.2 seems to be happier below 3000 rpm most of the time, with an occasional jaunt to 4000 or so in between shifts. I generally let mine stay in the 2-3000 range, and it seems happy there. The 4.2 is a low-end torque motor that wasn't really designed for much hot-rodding on the top end. Not to say that it's not a good little mill. It's overhead valve, all cast iron assembly that will run for a long time if you run it within its limits.
I also have the V6 5-speed, and I don't think my truck has ever seen 5000 in its life. I have the 3.55 gear, and it's not really a high revving engine. This 4.2 seems to be happier below 3000 rpm most of the time, with an occasional jaunt to 4000 or so in between shifts. I generally let mine stay in the 2-3000 range, and it seems happy there. The 4.2 is a low-end torque motor that wasn't really designed for much hot-rodding on the top end. Not to say that it's not a good little mill. It's overhead valve, all cast iron assembly that will run for a long time if you run it within its limits.
Fleet Mechanic
Joined: Apr 2014
Posts: 1,512
Likes: 7
From: Pittsburgh, PA
Ford may have programmed a stall speed or a governor into the PCM to prevent against over-revving, and you might have hit that. I'll occasionally hit 4000 if I'm feeling a bit frisky and running late for work, but otherwise I usually try not to go much over 3 grand. Ford's literature says the 4.2 doesn't make peak horsepower till 3750, so I'll occasionally wind out third up that high. Much higher and it starts getting running out of breath.
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