Water in #8 - Misfire

John Stephan · Sep 14, 2019

So, I've got a dead miss on #8. Its obvious on scan data and can watch the counter as I drive. I pulled the COP and there was water in the plug well. I blew the water out but haven't fired it up yet. Pretty sure this is the problem. It hasn't rained here all that much. This was a big problem on the 2V Triton. I cant find anything about this on the 3V. Truck had full timing, plugs, cops, etc. Last year and runs like a top. This problem JUST started. I'm in the middle of an oil change and will report back. Will also check all of the other wells on bank 2 just to be sure. Just wondering if anyone else has experienced the same issue.

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JuniorExp03EB · Sep 14, 2019

cheack weather seal in windshiled and confirm its warter and not coolant from leaking manifold gaskets

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John Stephan · Sep 14, 2019

Hard to tell if it was water or coolant. COP boot was white. Assuming aluminum oxide from water sitting against the head. 5,6&7 were dry. I couldn't see any moisture or spots around the manifold. I removed the weather stripping and cleaned some debris along the channel. Wiped the seal down with WD40. I'll check it tomorrow afternoon and see if I can find any leaks. Misfire is cleared up, plug was certainly fouled so it took a bit to clean it off, but it's back to normal, for now.

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JuniorExp03EB · Sep 14, 2019

if it was coolant it would look rust color and it would be obvious its coolant the smell would of hit your nose asap when you took the boot off. so yes. i would check the weather strip on the windshield and the plastic vent cover behind the hood. maybe just some water fell thru from a previous heater core flush previous owner did.

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JuniorExp03EB · Sep 14, 2019

if you have those endoscope camaras there $20 on amazon and ebay. investing in one will help youbwil alot of other repairs where you cant get your head thru. or u can use your camera phone to take a flash picture into the #8 spark plug removed and capture it. see how it looks. post it on here. give us some visual

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Trainmaster · Sep 14, 2019

Lick it. Seriously. You'll know if it's coolant.

I know, I know, don't drink the stuff. Just see if it's sweet.

Adieu · Sep 14, 2019

You people can smell coolant?

Wow, guess I should've quit smoking years ago... I'm pretty sure I still can't

RichardH · Sep 14, 2019

Adieu said:
You people can smell coolant?

Wow, guess I should've quit smoking years ago... I'm pretty sure I still can't

Lol, coolant has a very distinct smell - I can catch a whiff of it walking by cars with 'issues' at the gas station when filling up.

Curious to the OP issue - I heard about the #4 getting H2O from the heater core hoses but not sure why H2O in #8 - can you elaborate on why issue w/ 2V? I have a 2 valver...

John Stephan · Sep 14, 2019

2v issue is leaking thermostat or at least that what I read.

My misfire came out of nowhere. Truck usually garaged, but lately been sitting outside. It rained Tuesday and then we had the misfire on Wednesday. I cleaned everything up, the cowl did have a bunch of debris at the base of the weather stripping. Maybe it was just a fluke.

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John Stephan · Sep 15, 2019

Update. Drove about an hour today. Still had sporadic misfire at idle and WOT. Picked up a fresh plug on the way home. Once home, pulled COP and all was dry. Pulled plug and could see traces of spark jumping. Lots of white aluminum oxide, so I blew out the cylinder. I pulled the boot on the COP and found a mountain of white crusties where the COP and spring meet. I scrubbed the chunks off, anti seized the new plug, torqued to 25ft and buttoned her up. Runs like a top.

I'm guessing it was a combination of rain runoff and debris in the cowl gutter. I'll keep an eye on it.

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Water in #8 - Misfire

John Stephan

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