Most of the time it is a coil that is going bad(changing the plugs will not fix it, but if you replace the coil, replace the plug). The best way to find out is to get in to the MODE 6 data, of the OBD II data and find what cylinder is misfiring. This is what keeps track of misfires to turn on...
First off, check your air pressure in your tires. adjust to the sticker in the door jam or on the fuel fill door. Then driver the truck above 25-30 mph to wake-up the sensors. This should turn out the light if the tires are just low on air. If the fault continues you will have to get it looked at.
I dont know what year your truck is, but they all work pretty much the same. If you know where the a/c pressure cycling switch is (located on the accumulator, next to the firewall and has 2 wires going to it). The fastest way to check a A/C system is to unhook the switch and jumper the 2 wires...
Sorry to hear that the clogged ports did not fix the entire problem, but if they were full, they needed to be cleaned. Do you have access to a scanner/code reader and a hand vacuum pump?
Those are the tools I use to find out where the problem is. I guess you could use a volt meter and read the...
The port is in the elbow that the throttle body is mounted to and also that the egr vavle is mounted to. I would recommend that the elbow be removed for cleaning because large pieces of carbon would go in to the intake and could get stuck on a valve. There is also a chance that the DPFE sensor...
The green is for vaccum to the egr valve from the solenoid and should have vacuum only when the vavle is being actuated. The red line is manifold vacuum and should have 18-20 in-hg at idle. A common problem on the 4.6/5.4l is that the egr port in the elbow between the throttle body and the...
Have you tried to see if there any signs of water in the gem/fuse panel under the dash. It is very common to have the windshield leak and get water into those two things. Try to remove the 2 main connectors from the back of the fuse/ power box and look into the connector hole in the back with a...
I have changed a lot of plugs because of misfire issues and seen alot of problems with the Bosch. I recommend Ford plugs and might cost a few bucks more but changed out at around 100k should last longer than the motor and is better than having a problem when you really dont need one. Just my 2...
That is a build sheet that tells you what the truck was ordered with and not all the options that were available when it was ordered. Best place to look is a sales borchure. It tells all the options that were available on a xlt or limited.. A message center might not come on a XLT. Just like you...
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