All culprits I can think of have been replaced. Fuel pump, no change. Cam sensor, no change. Crank sensor, no change. Pcm, no change. Tps sensor, no change. Plugs, wires, cap, rotor, and Catalytic converter, no change. Unplugged O2 and, no change. According to the ASE master mechanic that scanned my truck everything is working like it should other than it is running a little lean. But O2 is cycling like it should to try and compensate. I thought that maybe the ignition coil was getting hot and may not be producing a hot enough spark. The only code that sets is a random misfire when truck acts up. Mechanic seems to think that maybe a fuel injector is failing when under load.

 

What brand crank sensor did you get?

 

Idk. I got it at autozone.

 

The scanner is picking up the cam and crank sync. Both look good

 

Hhmmmm........ These trucks REALLY don't like the cheapy brand sensors in critical locations...... If it hasn't been in there long, try warranty replacement, and see if anything changes.

 

If you ever figure it our let me know. Mine is a 95 5.2l that is doing the exact same thing. Press on the gas it sputters, spits, looses all go (like it's flooding out) but won't die. Just won't go. My truck has been to 3 mechanics and all 3 say there are no codes being thrown and they have no idea what's going on.
I have found if I remove the gas cap 80% of the problem leaves but when the gas cap is back on all hell starts up. Its been suggested the evap or catalytic is bad. Any ideas?

 

If removing the gas cap makes it run better...... replace the gas cap.

 

Did that... didn't help.

 

"mechanics" figure things out by doing tests not by just referring to what codes are there if any. I suggest you find a "mechanic" that will test the fuel pressure and see what effect the gas cap/evap system has on the pressure. Do you notice any pressure or vacuum release when you take off the cap? This is just my idea but the evap system may be putting the tank under a constant vacuum causing the pump to have issues pumping. Just my thought but is seems to be having a fuel starvation problem if you remove the gas cap and it solves the issue.

 

If a new sensor doesn't fix it, at this rate I'd say replace the ecu/ecm. The brains of course; in the end it does ALL of the thinking.


Electronics are wear items too.