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Mar 7, 2014 | 03:12 PM

Slave2V10

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Need V10 help

I am new to the forum, so howdy to everybody!

I have a 99 F350 with over 200k on it and have a problem and just cant seem to get to the root of the problem.

The problem started a few weeks ago, but has finally reached the point where I have to figure it out... The problem is sometimes it runs fine, others it doesnt. Just this past week, but ScanGuage II on it and got P0300 and P0309. So replaced COP and plug itself, let it idle and it ran smooth, no issues. Got in it and drove it, and it went to running so bad I barely made it up the driveway at home. Put ScanGuage back on it, got P0300 again, but different cylinder and it keeps jumping around on cylinders, first 6 then 2, etc.

Does anybody have any clue where to start or what could be going on? I need some serious help...I want my truck back!

Mar 7, 2014 | 04:15 PM

Slave2V10

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Recent new development: Pulled spark plugs out of indicated cylinders (2 and 6 so far) and each one had water in it. Is this a sign of a cracked/bad head? Not sure what to think about it as I have never experienced this before....this is my first V10. HELP!!!

Mar 7, 2014 | 04:25 PM

Quad Racer

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Joined: Jun 2011

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From: Cincy area

Is coolant low?
Check oil for coolant pollution.

Mar 7, 2014 | 04:34 PM

DavidB

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Did you check for water around the plugs before you pulled them, or were the plug wells dry and you had water inside the cylinder? Are you sure that it was water?

Mar 7, 2014 | 05:07 PM

Slave2V10

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Sorry, I should have been more clear....there was water on top of the spark plugs, basically the recesses were filled with water. Drew the water off, air-dried with compressed air, took spark plug out and replaced with new one as well as new coil on #6...the water was above the spark plug on this cylinder. On #3, water above spark plug, just blew it out..did not change plug. After this was done, ran good but still has the occasional "hiccup." Need some ideas to where this water is coming from. Ive read that V10s had issues with sucking water in through the air intake and that there was some kind of retrofit...not sure if this is my problem or not. I would like to look into this, however.

I appreciate the responses so far! Keep 'em rollin!

Mar 7, 2014 | 06:47 PM

jesse5

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From: Roanoke, VA

Intake leak

Usually it is an intake manifold leak filling the sparkplug holes, especially since you mention one on the left front of the engine. Welcome to forum.

Mar 7, 2014 | 08:31 PM

Slave2V10

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Jesse5, thanks for the reply and that makes sense! Cylinders 3 and 6 both had water in them. Managed to save a sample of what came out (what I managed to suction out) and run some between my fingers to see if it was oily, etc. It was just plain water, but dirty.

Thinking of going ahead with the task of replacing the manifold gasket. Are there any special tools involved? Any tips or special instructions to know before getting into this? Just asking so I dont have to make a million trips to the parts store. This is also my first V10.

Thanks to everybody that has responded! I sure appreciate the help!