Question about 2006 Ford F-150
I have a 2006 f150 5.4litre 4x4 130,000 miles, that started to have a slight miss on acceleration on occasion. Soon after this, the motor started to buck quite bad all of a sudden when under load. Its runs fine when idling. I took it into Ford dealership and put it on a scope. It came up as mutiple misfire on cylinders. Had all plugs changed, coil, gas filter and changed fuel. This did not solve problem. Rechecked on scope again and it came up #2 clyinder misfire. Checked plug and it looked very carboned up for a plug with only few miles on it. Checked other plugs and they looked Ok. Changed #2 plug again but still running bad. Put on scope again and nothing comes up now but fault on oil sensor. Would this have anything to do with misfire? still running bad and costing big time as plugs had to be easyout on origonal change. Seems to be worse as goes through different gears on this automatic. Any advice would be appreciated as I am mistified and so is Ford dealership.
Have your intake manifold o rings replaced. it is most likely that it would be a vac. leak. and the engine monitor cannot properly diasgnose this problem and having you replace 1000$ in parts and never find the problem.
Posted on Jun 06, 2009
SOURCE: I have a 2003 Expedition
Most likely the coils. Easiest way to check is swap them with another cylinder, start it, pull the plug wire connecter and if it doesn't change the engine the coil is bad. If it is the injector, then you can check it with an ohm meter. Touch the leads in the injector it should read 11 to 15 ohms. if you need help let me know.
Posted on Dec 02, 2010
Since you had problems with coil pack(s) previously, fire it up at
night inthe dark- you will see arcing long before evidence of carbon
tracking. You may have bad plug wires, you may have another bad coil
pack, you may have a different coil pack failing. you may also ahve a
plug wire that is not seated fully. Did you grease the boots
internally with some dielectric grease?
Check fuel pressure regulator, at idle, pull the vacuum hose off- if you get a stream of gas- the diaphragm is ruptured- replace regulator.
If no stream of fuel out the vacuum line and the engine shows no change in how it runs, put a gauge on it. 135 PSI is the range it should be. If higher- replace regulator.
Do a cylinder pressure test on each cylinder. This will reveal if you have a burned or bent valve
Consider a replacement set of injectors if the mileage on the vehicle is more than 75,000 miles- which is the expected service life of the injectors.
Posted on Feb 11, 2012
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