99 TJ Misfiring
I have a situation with my 99 TJ that I am hoping someone can help me out with. My TJ misfires under low acceleration and at around 1700-2000 RPM. I have changed the plugs, wires, air filter, checked the PCV Valve, and the throttle body. It only does it sometimes. Hopefully some of you guys can help me out.
did you do the fuel filter i've seen that before sputters at certain rpm..
also does it "miss" parked or just under load while driving
It only misfires under load that i can feel. Is the fuel filter a difficult job?What type of filter is it and where is it located?
yeah its a hard job its on the fuel pump in the tank you have to drop the tank and pop it out but if you unsure its best left to a tech.
get the fuel pressure checked it should be 14-15 psi at idle there is an adjustable pressure regulator if the pressure is high or low ther is ways of doing checks that will tell you if its a plugged filter or else..
fuel pressure should be around the 40 psi mark... lat time i checked ...
my bad got my years mixed the tbi is is 14-15 psi
the mpi should be 31psi at idle with the vacuum hose to thr regulator connected 39psi dissconnnected..
im pretty sure there is no fuel pressure regulator on tj's. its a single line from pump to rail. i could be mistaken but the thing with the vaccume line on the rail is a fuel pressure dampner.