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Discussion Starter #1
Here's the Story...
I have had the 2002 1500 w/ 4.7 for 6 months.. has 130K on the truck. Have been dealing with a misfire code on Cylinder #4.. replaced the plugs, swapped the coils around etc... reset the computer and all works fine ... for a while. Then the code comes back.

Since it was oil change time, I ran Seafoam treatment through the engine.. 1/2 through the oil to clean up the inside, and 1/2 through the fuel system. Replaced the fram oil filter with a K&N, Valvoline fully synthetic oil. Ran great on the way down the hill... 23 MPG over a 100 mile trip.

Went to start up and the engine would not turn over.. a clunk type of sound.. could hear the starter engage, but appeared the engine to be almost "frozen". the engine really never "cranked over". Cleaned the battery posts, checked the voltage.. 12.35V at the battery. No indications of any issues. Checked the codes when the battery was re-connected.. No codes.. a couple more tries, and she started. Drove another 15 miles, stopped for a while and started up fine... Except.. ---- There was smoke coming from the pipes, Magnaflow Cat back system.. The smoke eventually cleared up.

Next day, all worked normal.

Today, the issue returned, code P0304 again.. same starting failure, clunk, no turning over. let it sit 10 minutes.. Used the remote starter, and she fired up... Smoke returned... Ran rough. Burned out what appeared to be the excess fuel, and all seemed ok again.

My guess is if I pull the plug on #4, it will be showing a rich condition.. I will do shortly..

Anyone have this issue and does this point to a leaking injector?

Thanks,
Goatman
 

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Discussion Starter #3
Plugs, as requested...

Thanks for responding,

I changed the plugs a couple of months ago.. I found one with some of the ceramic broken away, thought that was the original source of the misfire, as it was possible for a fire to the cylinder wall and not across the gap...

I used the NGK v-power ZFR6F-11G... which was the same as what was in it.. gapped at .040..

The reason it appears that the injector is leaking, is the amount of smoke that occurs once it starts... It had the same symptom as a flooded engine.. sputtered until it cleaned the cylinder out, and all ran fine at that point.

The issue, as I see it, is that gas doesn't compress like a fuel-air mixture would. Once the cylinder is filled up and the engine comes up in the compression stroke, the gas had no where to go, thus causing the engine to be in a "frozen" state, which the starter could not overcome... By hitting the starter a few times, it allowed the combustion chamber to release the pressure, and would then start, although running very rich.

The only thing that changed was the seafoam treatment, and the oil change. I am thinking that some crud was knocked lose from the fuel filter and caused the injector to not close completely.

I am worried that the excess gas was forced by the rings and into the oil pan, although, there is no gasoline smell on the dipstick. there are only 2 directions the gas could go, up into the head once the valve opened, or down past the rings.

Goatman..
 

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Yeah I recommend to change the two sensors I told you and replaced the NGK with
RC12MCC4 (Champion). Our 4.7 runs best on these plugs. they seem to run ok with others but then give problems in the long run . Champions do very well in 4.7 and perform well to long term. the two sensors deal with the injectors pulse so check them out. If you think you don't wanna change it then remove the plugs early morning and look inside the cylinders and see if you see the fuel laying around or huge puddle on the piston.

Do you have a performance tune ?
 

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Discussion Starter #5
result

As I suspected, it was going into a Hyper-lock condition.. While checking the compression, it was discovered the #4 cylinder contained a large amount of anti-freeze.. thus, the head Gasket has failed...

Goatman
 

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Discussion Starter #8
head damaged...

got the head off and discovered a near hole in the chamber.. appears there was some metal floating around as the piston top was pitted as well as the head.. also found water in #8, but that may have drained from the head as I removed it. Off to the machine shop

sorry about the blurry photo..

Goatman
 

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