Engine Running 50/50
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Junior Member
Joined: Oct 2006
Posts: 2
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Engine Running 50/50
I have a 2000 Ford Lariat 4x4 7700 series with a 5.4 Triton Engine.
50% of the time it is running great with lots of power and smooth as warm butter.
However, the other 50% it accelerates roughly as if it is running out of gas or missing a cylinder and giving a horrible tinging from the engine as if the valves needed adjusting. At highway speeds around 100kmh it bucks and stutters like I'm running out of gas. If I step on the accelerator the knocking noise in the engine is scary and there is no horsepower.
I have replaced the plugs and fuel filter. After replacing the plugs it ran great for a day then back to its tricks again.
I am going to clean the MAF but replacing COPS is very expensive. Is it possible that there is a bad cylinder or valve agjustment is neccessary?
Any other ideas welcome.
CHeers
50% of the time it is running great with lots of power and smooth as warm butter.
However, the other 50% it accelerates roughly as if it is running out of gas or missing a cylinder and giving a horrible tinging from the engine as if the valves needed adjusting. At highway speeds around 100kmh it bucks and stutters like I'm running out of gas. If I step on the accelerator the knocking noise in the engine is scary and there is no horsepower.
I have replaced the plugs and fuel filter. After replacing the plugs it ran great for a day then back to its tricks again.
I am going to clean the MAF but replacing COPS is very expensive. Is it possible that there is a bad cylinder or valve agjustment is neccessary?
Any other ideas welcome.
CHeers
Senior Member
Joined: Jul 2006
Posts: 6,282
Likes: 1
From: Farmington, MO
one or all of your cops are bad... I had the same exact problem, after cleaning injectors, maf, replacing o2's, spark plugs, fuel pump, fuel filter, then i tried replacing the cops, and that was my problem!
Senior Member
Joined: Aug 2006
Posts: 614
Likes: 0
From: Troy, NY
It's worth a try, but I doubt it. It's not the contacts that are bad, the coil element or whatever is just broken down.
The coil packs seem to be a common cause of misfiring and general ****-poor performance in Triton motors. There's really no rhyme or reason to why they go, they just do. You try to test them all and track down the one(or more) that's trashed, but it's far wiser to just replace them all and be done with it. People on here have tracked down the one, replaced it, only to have another COP go a month or two later and the same problems return.
The coil packs seem to be a common cause of misfiring and general ****-poor performance in Triton motors. There's really no rhyme or reason to why they go, they just do. You try to test them all and track down the one(or more) that's trashed, but it's far wiser to just replace them all and be done with it. People on here have tracked down the one, replaced it, only to have another COP go a month or two later and the same problems return.