Hello! Just joined today.
Ford 4.0 V6 on my Mazda (94 B4000) and I am experiencing a problem. A little history on the truck before I get to the Problem. I have replaced Coil Pack, Plugs, Wires, DPFE, DPFE Hoses, Transmission, Torque Convertor, Thermosat, Brakes, Master Cylinder, Radiator, and a few minor things here and there over the past year.
Anyways on to the problem. I am sure you have heard of this problem before but I am experiencing a "bucking sensation" at 25% throttle. This happens whether going up hill or straight between 45-55..but Since I know how to create the problem, it can do it whenever i want it to.. Now I know the DPFE is normally the issue. (I have been reading alot this week) but I replaced the DPFE a few months ago and the problem still consisted. Found a vacuum hose disconnected 2 days ago, and that still didnt fix the problem. I am pretty decent at diagnosing problems but im starting to run out of ideas. I need to take a closer look at ALL the vacuum lines, but my senses are telling me I could have a Possible Sticking EGR Valve. I read that the EGR valves usually dont go bad but I have replaced almost everything in the system that I thought could be the problem.
Any helpful thoughts on this issue would be great, I usually work on my truck in my downtime so Im trying to get this last issue resolved with the truck.
Thanks to all in Advance!