Comments by "Mike Chiodetti" (@mikechiodetti4482) on "FordTechMakuloco"
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Being in California we don't normally get downpour rain however, one year we got way over our normal amount and sure enough, one of the 2004 F150's with the 4.6 got the top of the intake and all 8 plugs/coils bathed in water.
Barely ran, MIL light on, shaking like crazy.
Used my long tube air gun to clean out all the "wells" after removing all the coils.
Removed and checked the plugs, they were worn, made sure no moisture got in the combustion chambers using the long tube blow gun, installed new plugs, coils, air filter (it was dirty) cleaned the MAF sensor, changed the engine oil and filter (miles and time) and fired it up. Ran great. Reset the computer memory, road test and I knew the MIL would come back on and yes it did. All the misfiring dumped raw fuel into old cats (truck had over 150,000 odometer miles). So, new cats, new front and rear 02 sensors, another road test, truck ran like a dream for many, many more miles.
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Ya, I know about the burned intake manifold. I worked in a City (of L.A.) Fleet Shop, that our night shift had installed a new from Ford 5.4L 3 valve long block in a 2005 Expedition, because the old engine had one of the intake valve's stick open, allowing lots of hot gases and flames nearly destroy that part of the manifold. Not only that, but during the install the very small wiring harness that went to the IMRC stepper motor was damaged. So no electrical input or power to the motor, and I'm sure you know where THAT motor was located! Plus the night shift did NOT replace the intake manifold! The IMRC system did NOT work, power was down when accelerating. This is where I was called in as the day shift auto electrician. What a learning curve that was ! ! !
Yes I ordered the new intake manifold, the IMRC motor (didn't know it's condition) all the gaskets, coolant, etc, and THEN I had to rebuild the wiring harness for the IMRC motor to PCM connection.
THANK GOD for the Ford IDS!
I learned along the way how to manually test the IMRC electrically and monitor the PCM's control and monitor operation while driving.
Taking the vehicle for its final test drive coming out on to the street, giving it full beans (throttle) from a stop put a smile on my face! The power was GREAT, and even with the positraction rear end, you had to hold on tight! What a ride ! ! !
My apology for the long story, your burnt manifold brought up that memory!
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