Help! Truck Down! 2011 Ecoboost
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Tuned
Joined: Jan 2011
Posts: 316
Likes: 7
Help! Truck Down! 2011 Ecoboost
Yesterday I changed all 6 spark plugs for the second time on my 2011 F150 Ecoboost. The first time I changed them was around 70,000 miles and now I'm at 134,000 miles.
Anyway, when I started the truck the first 2 times after I finished last night it cranked 3x longer than normal, it idles fine, but barely runs down the road. The truck has very little power and feels like it's running on 2 cylinders.
Possible issues that I think could be causing this include:
- there's a wire harness over the one spark plug that got knocked around when I was removing the spark plug cable yesterday, I will get a picture in a bit
- issues with the new plugs? anyone know what the gap should be?
- I don't think I got the spark plug "wires" mixed up but I'm going to check again
thanks for your help
Anyway, when I started the truck the first 2 times after I finished last night it cranked 3x longer than normal, it idles fine, but barely runs down the road. The truck has very little power and feels like it's running on 2 cylinders.
Possible issues that I think could be causing this include:
- there's a wire harness over the one spark plug that got knocked around when I was removing the spark plug cable yesterday, I will get a picture in a bit
- issues with the new plugs? anyone know what the gap should be?
- I don't think I got the spark plug "wires" mixed up but I'm going to check again
thanks for your help
Lead Driver
Joined: May 2015
Posts: 5,868
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From: Mts. S. of San Francisco
OBD codes? I know that I swapped a couple of wires one time, and that was adventure!
Cargo Master
Joined: Apr 2007
Posts: 2,659
Likes: 2
In this case the lay of the harness makes it really hard to screw up, and the fact it is coil on plug.
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Tuned
Joined: Jan 2011
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My dad walked over when I had all the plugs out yesterday and said the same thing "I always did one at a time".
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Cargo Master
Joined: Apr 2007
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That was the logic I used with my guess.
There are two fuel pumps. The one in the tank is a lift pump, and that metal block on the passenger side cylinder head is the high pressure pump. Maybe enough fuel is provoded by the lift pump to start and idle (poorly) but not drive. I'm just guessing of course, as I don't know if that is possible.
There are two fuel pumps. The one in the tank is a lift pump, and that metal block on the passenger side cylinder head is the high pressure pump. Maybe enough fuel is provoded by the lift pump to start and idle (poorly) but not drive. I'm just guessing of course, as I don't know if that is possible.
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Tuned
Joined: Jan 2011
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You can see in the picture the brown and yellow wire I damaged during the plug change. Can anyone tell me what that wire does for the fuel pump and if that could be causing the problem? It looked like it wasn't pushed in far enough and we're working on it right now.
Lead Driver
Joined: May 2015
Posts: 5,868
Likes: 356
From: Mts. S. of San Francisco
That's a good plan. I did it when I was young & foolish, and I was replacing the entire spark plug wire set. Hopefully I am a little smarter these days...
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Joined: Aug 2003
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From: Isanti, MN
Glad to hear you got it figured out!
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