#7 cylinder miss
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Junior User
Joined: Aug 2010
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#7 cylinder miss
my #7 cylinder is missing like mike tyson at a spelling bee, was running great changed all the plugs, all the boots and springs, I also changed the coil pack in #7 once I figured out which cylinder was missing, it seems to come and go but I'm sure its number 7 put an infared on exhaust manifolds all of them 500 deg. f. except number 7 which is 200 deg f.
Senior User
Joined: Dec 2008
Posts: 439
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From: Lubbock, Texas
Remove the two bolts that hold the fuel rail down. Pull the fuel rail up from the front #6 and #7. There should be enough play to get those two out without any problem. They have O-rings on both top and bottom sometimes the O-ring will stick in the manifold or fuel rail, make sure you pull them out and re-install them on the injectors. Make the swap, line up the injectors and fuel rail...push down until seated. Install two bolts and done. Should take more the 15 minutes.
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Joined: Dec 2008
Posts: 439
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From: Lubbock, Texas
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Hey Mr. pipeline, what do you think about this I'm stumped ready to pull my hair out.
I just installed a flowmaster muffler, I have come to the conclusion it is bad. It was misfiring and I finally have that squared away(i think) went to autozone had them run diagnostic cleared it then went for a ride and came back and no codes showed up. But I'm still getting that sound out of the muffler of a misfire and around 55-60 mph i get a little hesitation like a misfire. Anybody have any ideas????
I just installed a flowmaster muffler, I have come to the conclusion it is bad. It was misfiring and I finally have that squared away(i think) went to autozone had them run diagnostic cleared it then went for a ride and came back and no codes showed up. But I'm still getting that sound out of the muffler of a misfire and around 55-60 mph i get a little hesitation like a misfire. Anybody have any ideas????
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FTE Legend
Joined: Apr 2010
Posts: 127,357
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From: Peoria, Illinois
Spark plugs and boots were replaced. Are they Motorcraft or Autolite? Modular's don't always like anything but OEM.
FTE Legend
Joined: Apr 2010
Posts: 127,357
Likes: 3
From: Peoria, Illinois
Yes! Bosch is one of the plugs that these engines don't like, missing is one of the symptoms.Someone else will chime in here with more info. This may be the problem.
