The_Hoove
NAXJA Forum User
- Location
- 20 Mins from Fordyce
I have a 96 4.0 Sport, auto. Short back story, bought it, drove it a few hundred miles, built suspension for it, drove it a bit, took it on a day drive. During the drive, the alternator died. Drove home, 60 miles, with no alternator. Stuck a Used alternator in it from a buddies part jeep. A few days later, started getting cel. Checked codes, Had random cylinder misfire as well as #1,2,5,6. Did plugs, wires, cap, rotor, coil. Standard champion copper plugs. Cleared codes. As soon as monitors reset, codes started coming back. Decided to check the used alternator, had AC voltage. Put a new alternator on it. Cleared codes, came back. With the scanner, monitoring misfire counters, I have nothing, as I raise the rpm, about 2000rpm, every cylinder starts counting misfires. At 3000rpm it goes into overdrive counting misfires. If I drive around town, its dead smooth. It only throws the code pulling a hill on the freeway above 2500rpm or so. Unplugged the rear o2 sensor and monitored misfires, no change. Checked for vacuum leaks and seafoamed the engine. I checked fuel pressure, 39psi, spec is 42 +-5, So its a bit low. But not sure low enough to cause a problem. Fuel filter is new. I can not feel it misfire ever. Got plenty of power. Decent fuel econ. Just throws the codes. I dont want to just throw parts at it, so wondering if anyone has had a similar experiance. No one had our shop is quite sure which way to go. Its every cylinder randomly. oh, tps is new by previous owner.
Thanks
Thanks