f-150 acceleration problem
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f-150 acceleration problem
I have a 97 f150 4x4 problem is i cant pull out onto a highway truck loses power at low rpms it is ok at an idle runs smooth ok at high rpms runs great it loses power from take off to 50 mph then smooths out-i replaced the plugs wires -maf-egr-coils -air filter -fuel filter -injectors -tps- truck has a 4.6 with plug wires no c.o.p. now the check engine light is on -reads code for bad egr-
any any ideas truck also runs great when pulling a load -but when empty cant get out of its own way
any any ideas truck also runs great when pulling a load -but when empty cant get out of its own way
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i had an egr problem with my 97 too, it shook soo bad at low rpms, it felt like a cylinder missfire, had it in the shop a few times with no help, got mad at it and beat the crap out of it by drivin it real hard. whatever it was, ended up fixed! only if i had known that before i brought it to the shop and they worked on it for 2 hours.
P.S. did you happen to clean the carbon build-up out of the pipe goin to the egr valve from the manifold?
P.S. did you happen to clean the carbon build-up out of the pipe goin to the egr valve from the manifold?
Last edited by 97F150project; Feb 21, 2006 at 11:47 PM. Reason: thought of something else
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Joined: Oct 2005
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i had an egr code on my 99 f150 4.6L, and my egr ports were stopped up with carbon build up.. that is probably what is wrong with your truck. I replaced the egr and dpfe sensor and the problem was the clogged up port.
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Joined: Dec 2001
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From: Southeast FLA
Actually, from what I can tell, based on the boards here, many of us are running around with completely clogged EGR ports, but our engines aren't problematic due to it.
I did finallly figure out what my problem was - a bad wire.
But as for the EGR, with the exhaust gas blocked from entering the mix, the truck is left to use air. Fuel is going to burn better, and more readily, with air. I have a sneaking suspicion that the blocked EGR ports, and codes it throws, mean little to how the trucks run. The codes may be there to tell a technician in an area with vehicle smog inspections, but I haven't read anything definitive that the computer changes the fuel delivery / spark / ??? once the EGR code is thrown.
Seeing as how so many of us have been, and are, driving aorund with clogged ports, yet no decrease in horsepower, I was waiting for someone - like you - that had a truck that ran better after fixing the EGR port problem (unless your sensor had a vacuum leak in it, that could have caused your trouble).
I did finallly figure out what my problem was - a bad wire.
But as for the EGR, with the exhaust gas blocked from entering the mix, the truck is left to use air. Fuel is going to burn better, and more readily, with air. I have a sneaking suspicion that the blocked EGR ports, and codes it throws, mean little to how the trucks run. The codes may be there to tell a technician in an area with vehicle smog inspections, but I haven't read anything definitive that the computer changes the fuel delivery / spark / ??? once the EGR code is thrown.
Seeing as how so many of us have been, and are, driving aorund with clogged ports, yet no decrease in horsepower, I was waiting for someone - like you - that had a truck that ran better after fixing the EGR port problem (unless your sensor had a vacuum leak in it, that could have caused your trouble).
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My 2001 F-150 threw a code 402, and I did notice improved gas mileage in spite of degraded performance. Maybe it's the 10% ethanol in the gas corroding junk off the tank and lines...
So is the EGR something we could replace ourselves? I've looked high and low for a how-to on the 'net and it seems to be top-secret.
So is the EGR something we could replace ourselves? I've looked high and low for a how-to on the 'net and it seems to be top-secret.
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Joined: Dec 2001
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From: Southeast FLA
danmar, there is at least one huge thread on the EGR and it's code - and, by and large, it really looks like it's throwing a code due to the carbon blocvkages, in the ports of the throttle body, not because the EGR, or its sensor, went bad. Do a search in this 1997-2003 forum, you'll probably you'll find it as it's been posted to pretty recently.
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