#4 clinder misfired......Question????
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Joined: Jan 2004
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From: Simpsonville
#4 clinder misfired......Question????
After replacing the plug and plug distributor what else could cause the cylinder to misfire? Injector??? 
Truck is a 97 F250 light duty 2wd 5.4l.....
Truck is a 97 F250 light duty 2wd 5.4l.....
Posting Guru
Joined: Oct 2005
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From: Louisville, Kentucky
I am thinking that you replaced #4 spark plug and COP and still have a missfire DTC for that cylinder. A common problem with these early F-150s is a slight leak from the heater hose that is directly above the COP. The heater hose clamp is loose and you get an occasional drip of coolant onto the COP and down into the spark plug well. This can cause the COP to fail or the spark plug to fail. Tighten the clamp and be sure to use dielectric grease on the spark plug boot to keep moisture out of the equation. Good luck! 
Cross-Country
Joined: May 2008
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P0304 Cylinder 4 misfire all the way to heater hose leak.
1. Can I fill the spark plug boot up with as much dielectric grease as I can get in there?
2. I tightened the clamp and the leak still occurred. I inspected the hose and and metal tubing rising up from the block. I cannot find anywhere that a leak should be occurring. Any ideas from past experience on this issue?
3. It appears that this leaking hose is connected to the heater block inside the glove box. Does fluid only travel thru this hose when the heater is running?
Thanks to all for help.
Posting Guru
Joined: Oct 2005
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From: Louisville, Kentucky
- That might work but, I don't know that for sure.
- Some have reported water dripping down from the rain gutter along the firewall.
- Water is flowing through the heater core at all times.
Cross-Country
Joined: May 2008
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I tightened the clamp for the heater hose and created a "catch" out of a soda can for the leak, if the leak still exist. This way the leak will not drip into the spark plug boot, but I will be able to still see the liquid. The truck is running normal right now. This will be trial period. If the P0304 come back I'll have to look for other leaks. Thanks for the help.
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brimis
1997 - 2006 Expedition & Navigator
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Feb 2, 2013 08:54 PM
