I have had a hell of a time with this one since someone else had the car before me and had done a cylinder head job on it. When someone else messed with it before you got it and the seller doesnt mention a flashing engine check light that comes on if you gun it, you kinda wonder how much back tracking you have to check out. Well, here is the adventure. Before I begin, I'll add that I am a ASE Technician, with 10 years experience, mostly GM and Honda.
P0301 Misfire Cyl 1, comes up any time you hit that gas to pass or get on a california freeway. At first I thought the coolant was being consumed and did seem that way. Like the car was sipping it or something till it got just to the bottom of the cold fill range, but it never seems to go any lower really once it gets there. Keep in mind, I never fill a res above the full line cold. At first I was scared and thought I was in it to shell out some dough to send the heads to a good machine shop, thinking some hack got a hold of it, but I did the block check with the chemical and it never even turned greenish blue, pumping the bulb for 3 minutes. Now Im thinking intake gaskets since I see a bunch of rtv around them, but when I get the intake off, I dont see any indication of a problem really other than sloppy work. Once I see all this Im back to thinking the Head Gaskets or valve seats since the cyl 1 intake valve is the only valve with some carbon patches on it.
Before I slapped myself and got into pulling the cylinder heads, I decided to check the coil cluster, despite it passing all test initially before I even began this fiasco. It bench tested with a DMM
just fine, but when I flipped it over for a visual, I found something fascinating. The casting under the pack for cyl 1 and 5 has two cracks and some carbon tracing to it that showed up like a christmastree under camera flash as well. Now Im not finished but, Im going to put this guzzler back together and drive it to a job interview tomorrow morning. Im leaving the mechanic trade to get into IT since the dealerships have gone way down hill with the flat rate pay system and the private shops pay less every year and hardly have the diagnostic special equipment or even good enough scanners to call themselves a shop. After my interview I plan to buy a coil cluster pack, but since I have been out of work for 5 weeks and unemployment check still isnt here (got to love how our idiocracy works here in the US), I am broke as a joke and really dont want to burn money I can eat with. I have not worked on many fords, but I am a very skilled diagnostic tech.
What Im asking is this. Has anyone ever had the same single cylinder misfire under WOT
or heavy load, and discovered a cracked coil pack on the bottom side, replaced it and it fixed that annoying come and go engine check light for the cyl 1 misfire? Also, I know some people might poke fun at me for no compression check or leak down. I did that and they were all even. Unable to do a leak down since someone stole my leak down tester from the last place i worked at, and no one even knows what they are at the tool rental places. Money doesnt grow on trees, folks. Am I right?