5.4 intake replacement
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Lead Driver
Joined: Nov 2008
Posts: 8,449
Likes: 70
From: South Jersey
5.4 intake replacement
So the stock intake started leaking at the coolant crossover on the passenger side. Waited almost THREE months for Ford to manufacture new ones and I just picked it up last Thursday. I have a set of Mahl gaskets but I was wondering if I should replace the knock sensor that in the valley? I have 188k on the old girl and I'm concerned I'll remove the intake and find the knock sensor wiring chuffed or corroded
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Lead Driver
Joined: Nov 2008
Posts: 8,449
Likes: 70
From: South Jersey
I'm only concerned because twice now I got stuck with the knock being bad after I pulled intakes. Once on my brother's 2001 f150 with 4.6, he only had 112k when I swapped his intake and the wires on the knock had all the casing missing! Second was on a buddies 2003 f150 super crew with 5.4, his coolant was leaking just like mine. I got to the point where I pulled the intake and one wire into the knock was corroded and broken off flush. And of course both times our ford dealer did not have them in stock so we jad to wait almost a week!
It's not fun having a truck stranded in front of my garage
It's not fun having a truck stranded in front of my garage
Mountain Pass
Joined: Jan 2013
Posts: 140
Likes: 14
I would consider replacing the knock sensor. I had a knock sensor that threw fault codes when it was damp outside until the engine heated up causing restricted performance. Granted it was a supercharged Jaguar so even restricted it had good street manners. Thing is I had the valley exposed when I had the supercharger off to replace coolant hose and it did not occur to me to look at the knock sensor. Now I suppose it could have had a chaffed wire or bad connector.
Laughing Gas
Joined: Jan 2019
Posts: 868
Likes: 84
From: Florida
SuperDutyScaler:.......I have a 2002 Ford F 250 5.4L V-8 (gas) and also have the small coolant leak around the thermostat area of the crossover tube. I also want to get in there to replace the Intake Manifold as well as the Coolant Crossover as it is 20 years old. As far as the knock sensors (while I heave everything apart) what should I look for and exactly what makes up the knock sensor itself.
Have you done the work yet? How long does it take and what are we taking apart to get the Intake Manifold removed? How much time should I allot to get it done?
Thanks,
PJ
Have you done the work yet? How long does it take and what are we taking apart to get the Intake Manifold removed? How much time should I allot to get it done?
Thanks,
PJ
Last edited by PJWhelan; Mar 9, 2022 at 09:28 PM. Reason: grammatical error
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