Need help troubleshooting

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Dec 14, 2016 | 01:50 PM

treyw147

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Joined: Nov 2014

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Need help troubleshooting

I'll start off by saying my truck is a 2000 f250 superduty with 176094 miles.
I noticed I wasn't getting full power so I read the codes. 4 out of 10 cylinders are not firing. I didn't some checks and noticed that the spark plugs in the misfiring cylinders are soaked in fuel. So I figured it was the coil pack. I'm saving up to buy all 10 when today the oil pressure light comes on. Now I'm not sure if the coils are the problem. before I drop all this money can someone reassure me I'm not going to waist money here. thanks

Dec 14, 2016 | 06:24 PM

Im50fast

Cargo Master

Joined: Apr 2013

Posts: 3,087

Likes: 24

From: Central Florida

Check the oil level and correct if it is low.

These engines consume oil- about a quart per 1,000miles. So if you haven't checked your oil in the last 5,000miles then it could just be "normal low". My oil light was peaking at me occasionally last month and it turned out to be just way too long since I had checked or added oil. I added 5 quarts and to the best of my memory it was about 4 weeks since my last oil check (I drive about 1,000miles per week). It all added up.

Dec 14, 2016 | 08:59 PM

fordmerc

Elder User

Joined: Mar 2007

Posts: 695

Likes: 4

Not all v10's consume oil. Mine gets driven about 6K a year and 5k of those are towing a 8.5K pound trailer and burn about a quart every 5K miles.

Since it sounds like you may have been driving for sometime with dead cylinders, your injectors put a lot of unspent fuel into the engine. I would change your oil and see what that does, as I suspect your oil is fuel soaked.

If you must keep driving the truck with bad coils, which is not a good idea, it is a good idea to unplug the injectors to the bad cylinders.

Also, hopefully you didn't already fry your cat!

Dec 14, 2016 | 10:29 PM

R&T Babich

Fleet Mechanic

Joined: Feb 2011

Posts: 1,812

Likes: 88

From: Thousand Oaks, CA

Quote:

Originally Posted by treyw147

... 4 out of 10 cylinders are not firing. I didn't some checks and noticed that the spark plugs in the misfiring cylinders are soaked in fuel. So I figured it was the coil pack. ....

The COP assembly has 3 parts - coil,boot,spring.
The coils last a long time and are probably still good.
I would change the plugs/boots/springs on the 4 bad cylinders and see if they still misfire.
If that fixes the problems change all the boots/springs.
At 176k if the boots/springs are original they are way over due.
I change plugs/boots/springs every 50k.
I use NAPA Belden 702418 boots/springs $6/ea.
Our 2003 Exped still has all original coils at 160k.

Dec 15, 2016 | 12:08 AM

twigsV10

Cargo Master

Joined: Jun 2010

Posts: 2,113

Likes: 4

From: Iowa

If multiple cylinders are miss firing the idle speed could be low enough to set off the oil pressure light. I personally wouldn't throw money at coils until I pulled them out and inspected the spark plug holes, it's very common for water to make its way down and short the spark plugs out and/or the plug boots can crack with the same result. (it doesn't take much for it to cause a misfire)

Don't like saying it but multiple misfires and being driven kills the catalytic converter ridiculously fast... Dads 00 destroyed it's converter in one day and less than 20miles with the same problem.

Dec 15, 2016 | 12:40 AM

R&T Babich

Fleet Mechanic

Joined: Feb 2011

Posts: 1,812

Likes: 88

From: Thousand Oaks, CA

Quote:

Originally Posted by twigsV10

... Don't like saying it but multiple misfires and being driven kills the catalytic converter ridiculously fast... Dads 00 destroyed it's converter in one day and less than 20miles with the same problem.

I had misfiring on our 2003 Exped 5.4L caused by a misaligned firewall pad allowing rain runoff to drip onto #6 & #7.
Misfiring was intermittent and it doesn't rain much in Socal.
It was my first experience with these engines and it took a month to figure it out.
Ruined the Cats.
This along with plugs working loose in aluminum heads are 2 reasons why I change plugs/boots/springs at 50k.
Both Tritons are running great these days.

Dec 15, 2016 | 06:50 AM