Hello my name is Steve W, there is no egr valve system on the 2006 f150, they use variable cam timing to control emissions.
Any more questions just ask, Thanks Steve W
i have a misfire situation, seems as though you lightly touch the gas pedal and the truck stumbles
Is the check engine light flashing or illuminated?
stumble as though tranny is jumping
you mean slipping?
not really , shudder
Does it feel like it is the rear diiferential on turns?
no put the limited slip dif additive long ago. stumped
Can you duplicate the concern while power braking the engine , not moving?
in motion, when wanting to throttle up for more speed, it will stumble or shudder if you will . usually when at cruising speed
Ok, this sounds like you have a misfire, possible spark plug or ignition coil.
no ignition issues spark plugs changed and a couple of suspect coil packs phasers?
Doesn't really sound like a phaser problem, has power balance been monitored while the event is happening? To see it if can be pointed to a specific cylinder?
no codes are showing up, i m confused.
Do you have a good scan tool?
Look at mode 6 data for cylinder misfire, look at all 8 cylinders, the ones that should a percentage are the culprits.
show a percentage
i ll check, do you think it may be out of time?(lash adjusters)
I really don't think so, if there was a problem with timing the check engine light would be on or a code stored.
true thanks for the input