Question about 2002 Ford F150 Regular Cab

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Our 2000 Ford F150 will run well for a short period of time, then it loses speed and power and after a short period it will backfire. Then it will run well for a while again. It runs well when used to plow our yard and driveway. We have replaced the spark plugs and EGR valve.

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  • Ford Master
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I would suspect the fuel system mabay fuel filter or the cataylic converter is haveing clogging issues do you hear a rattling noise comeing from the exhaust area.
If you can plow then one would think its cold and you have the fuel and air comeing into the engine aswell as a good electrical spark
to produce enough power to move snow .Its heavy
Then mabey the exhaust can't get out as fast as it needs to under all condutions creating to much back pressure for the engine to run under warmer condutions .
Can't say for sure but if you have fuel air and a good spark it should run even if you had a trained monkey sitting under the hood pouring gas into the intake manifold with a tea cup unless the exhaust gase's can't get out of the cycle

Posted on Mar 28, 2015

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  • Ford Master
  • 373 Answers

My 1999 5.4L 110,000 miles had a similar problem that got worse with time. Over a year, I replaced all the plugs and coils, then replaced the fuel filter. The fuel filter seemed to help for a while, but ultimately it was the fuel pump that fixed it. It had good pressure, but poor flow/volume. No engine codes. Good luck.

Posted on Mar 28, 2015

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  • Ford Master
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O.K. what size motor when you changed the spark plugs were they wet ? if it's a 6cylinder check the wires for breaks or if they are old they should be changed if you have the 8cylinder there are individual coils with plug boots these must be inspected and flexed and squeezed checking for cracks in them that could leak + voltage to engine block - this will cause the misfire/backfire also check the coils themselves for cracks or a bad one that's not firing can be checked by unplugging them one at time if the engine running condition changes when unplugged that ones firing/// if it doesn't change and runs the same when unplugged that coil is no good but I think you have the wires /boots problem here also does the truck run good when cold EX. you get in start it up and drive it and after it gets warm this happens ///// if so the throttle position sensor is worn at the idle position and must be replaced when the truck is cold the throttle position sensor is at a different position for faster idle speed to warm up the truck the idle air control valve will speed up the rpm's and the throttle position sensors position will change but once it gets warmer the position changes and now could be in the badly worn spot causing not enough voltage to get through and thus the missing back fires and stumbling when you try to accelerate when the truck is warm can you put it in park and race the engine without problems or does it do it only in drive all the time if it's only in drive the sensor is n/g//// if it's in both P/D the wires boots coils or the idle air control valve can be at fault but I really need more info as to how and when so if you could check these things and post back with progress made and things that can be eliminated I can get a better picture of what's going on here remember any body who is trying to help you here is not at the truck so we all need as much info as possible to try to help you so specific things must be explained motor size is one of them because there are different systems also any work done must be explained clearly not vaguely EX. what you did ////what you found///were those plugs you took out black with soot or covered in white/tannish hard ash these things all describe running condition of the engine and how much mileage is on the motor? determine how a diagnosis from a far can be made O.K.

Posted on Mar 27, 2015

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Posted on Jan 02, 2017

  • 15 Answers

SOURCE: I have a 98 Ford Ranger, 3.0L. I replaced the EGR

i would change your idle air controle its 60$ and a great start

Posted on Apr 25, 2010

dttech
  • 4803 Answers

SOURCE: p0402 error,where is the egr

If you have a code P0402 on a Ford truck, replacing the EGR valve has about one chance in 20,000 of fixing the problem. The most likely cause of this code is a bad DPFE Sensor. The next most likely cause would be clogged EGR ports. The next most likely cause after these would be a broken vacuum line or a failed vacuum control solenoid. The EGR valve itself is the least likely cause of this code. I have been in this business for 36+ years and still have enough fingers on one hand to count the number of failed EGR valves I have ever seen.
Also, I can't be real specific in telling you exactly where it is located without knowing which engine you have...All I can tell you is to look for the steel pipe coming up to the engine from the exhaust. The EGR valve will be at the end of it.

A little note for the wise:
Fault codes retrieved from the onboard computer systems in automobiles NEVER tell you which parts to replace. All the fault codes do is tell you which of the many circuits and systems that are monitored by the computer is malfunctioning. Once the fault codes are retrived, the circuits or systems involved must be diagnosed to find the actual cause of the problem or failure.

One of the biggest misconceptions of the American public is that all an auto repair technician has to do is plug-in the "Magic Box" and it will tell him exactly what is wrong with the car and what parts to replace. Nothing can be further from the truth. I really wish it worked that way. If you find one of these magic boxes, let me know, I need one...LOL

Posted on Mar 12, 2011

SOURCE: Ford F150 engine backfiring, running/idling rough

I Have a 1999 ford f150 4.6 that back fires and is just running really ruff when idling alot of nack fire a sord of like a pulse going on what is my problem?

Posted on Oct 12, 2011

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