Intermitant miss, more under load.
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Senior User
Joined: Dec 2004
Posts: 123
Likes: 1
From: Greenbackville, VA
Intermitant miss, more under load.
Any thoughts? Truck has 171k on it. I've had it since 140k. I figured I'd do plugs and boots. Started this evening with #1 or #6, drivers side front as it looked to be the easiest one. Pulled that coil and boot and thought, hmmm, that boot and spring look damn good? Pulled the plug and it looked good to and had a gap of about .054. Spot on.
Then I slowed down and thought for a minute. Put the old plug back in. Started the truck, blocked the wheels, put e brake on, and put truck in gear to better hear the miss. I killed each coil one by one and they definately made a difference, so its not a dead hole?
Should I just go ahead and replace the plugs/boots.
Will a scan gauge !! do a drop cylinder test, or tell which cylinder is misfiring?
Thanks in advance,
Then I slowed down and thought for a minute. Put the old plug back in. Started the truck, blocked the wheels, put e brake on, and put truck in gear to better hear the miss. I killed each coil one by one and they definately made a difference, so its not a dead hole?
Should I just go ahead and replace the plugs/boots.
Will a scan gauge !! do a drop cylinder test, or tell which cylinder is misfiring?
Thanks in advance,
Senior User
Joined: Feb 2011
Posts: 262
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From: Austin, Tx
I had the same problem and just did new plugs/boots without trying to figure out which was the culprit, the miss went away and I called it a win. I now know for sure how old the plugs/boots are as a side effect. If you still had a miss after plugs/boots then figuring which COP makes sense given the cost of just replacing all the COP for the heck of it.
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Senior User
Joined: Dec 2004
Posts: 123
Likes: 1
From: Greenbackville, VA
All fixed up! Scangauge II said miss on #4. I was going to swap coils with one to see if the miss moved. When I did,I noticed some corrosion on the boot / spring. I replaced the boot / spring and problem solved.
Just thought I'd complete the thread....
Thanks all,
Just thought I'd complete the thread....
Thanks all,
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