Got no power
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Joined: Sep 2009
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Got no power
New to this forum and I just bought a 99 5.4l 204k 4x4(my first ford in over 10years) the check engine light was on for cop8 I replaced it and fixed some of the vaccum lines and got ride of all the shakes the truck had. but the truck can hardly pull itself up a hill and ran some seafoam threw and i'm going to change plugs tomorrow. I have noticed twice it lost oil but it came right back. im gonna check compression while i have the plugs out, but any other ideas of what i could do to get power back or does it sound like this engine is dead?
Elder User
Joined: Jun 2004
Posts: 747
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From: Pelahatchie, MS
That's true about the raw fuel, but I'm betting on fuel. Besides, wouldn't a stopped cat throw a code on an OBDII system?
I bought my truck in a non running condition. The only symptoms I had to go by were from the previous owner: 1) "it just won't turn any more, I think it's locked up" and 2) "it just started losing power and I drove it for a while and it just quit"
The motor was seized up. It had 250K miles on it. But I really don't feel like that was the main cause of the power loss (I feel like that was a teenage boy who treated the truck like a dune buggy). The fuel pump was also in a failed state. One engine, one hot battery, and one fuel pump/strainer assembly and a fuel filter later, it runs like a new truck.
Before I replaced an engine, I'd check to make sure it's getting good fuel pressure....
I bought my truck in a non running condition. The only symptoms I had to go by were from the previous owner: 1) "it just won't turn any more, I think it's locked up" and 2) "it just started losing power and I drove it for a while and it just quit"
The motor was seized up. It had 250K miles on it. But I really don't feel like that was the main cause of the power loss (I feel like that was a teenage boy who treated the truck like a dune buggy). The fuel pump was also in a failed state. One engine, one hot battery, and one fuel pump/strainer assembly and a fuel filter later, it runs like a new truck.
Before I replaced an engine, I'd check to make sure it's getting good fuel pressure....
Elder User
Joined: Jun 2004
Posts: 747
Likes: 2
From: Pelahatchie, MS
I've got basically the same truck, but it's an '02. AllData says fuel pressure on the '02 should be:
Key on, engine off 240-310 kPa (35-45 psi)
Engine running 193-345 kPa (28-50 psi)
Key on, engine off 240-310 kPa (35-45 psi)
Engine running 193-345 kPa (28-50 psi)
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New User
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Well I changed my plugs and filter it does run better but problem is still there. Would a bad TPS cause this condition? or anyone else got any other ideas?
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