5.4 misfire
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5.4 misfire
On the way back from vacation this weekend, our expy started misfiring. At least it was on the way back and not on the way there. Had the check engine light blinking which indicates misfire. When we arrived home, went to Autozone to check code. It read p0304, which is the notorious #4 coil. Upon removing the #4 coil, it showed signs of antifreeze on it. It wasnt wet 10,000 miles ago when I changed the plugs. The truck now has 84,000. The coolant line connection just above it was wet. The antifreeze level is still well within normal range which indicates to me it doesn't take much coolant to spill on #4 coil to make it go bad. Already have changed #4 coil, but need to fix the coolant leak at the connection. Has anyone had experience in changing the coolant hose above it to fix the leak? Is the coolant tube usually in need of replacing or is it just a new rubber hose that will take care of this. Don't want to run the engine again till I fix the coolant leak. Dont want to ruin a $50 coil.
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Well....I actually read an old post about this same problem. The coolant line connection just above the coil is the old radiator style clamp. I had just presumed it was the new spring style clamp. Upon inspection, the clamp was barely snug. Probably got a turn and a half on the clamp till it was snug again. Ran truck, runs great, no leaks, no check engine light anymore. A cinderella story. I think i'll put a short piece of that black plastic corrugated tubing over the connection so if it ever does leak again, it'll leak off to the side and not on the coil.
5.4 misfire # 4 coil pack
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