2002 Super Crew 5.4l

Codes are lean on both banks and miss on #3 cylinder.

Misses on tip in of the throttle. Runs find at WOT. Misses under heavy load on a hill though.


Plugs looks decent and COP's test fine.


DPFE sensor possibility?

 

Try cleaning your MAF.

 

CHECK FOR A VACCUME LEAK AT THE PCV ELBOW FOR THE LEAN BOTH BANKS.AND SUB A NEW COIL IN THE NUMBER 3 HOLE.CHECK THE # 3 PLUG FOR A LINE OF BLACK DOWN THE SIDE CALLED A CARBON TRAIL.

 

ya i will check the vacume leak at the PCV elbo, im pretty sure there is one somewhere already as the truck will switch to defrost from vent from time to time.

#3 plug/ COP look fine, have switched already.

 

What is the fireing order? and what is the cylinder location.

Pasenger side front to back 1234
Drivers side Front to back 5678

When the code reader tells us a miss on #3, i assume it means #3 hole, or could it be #3 in firing order, in which case #7 hole would be that.


Just looking for more alternatives. I thinkt he MAF is fine but i will check again.

 

When the code calls out a cylinder by number (ie. #3), it means cylinder #3. Comprende?

 

Ya thanks.....