Hello all,
I bought a 95 Cherokee 4.0 auto.
Engine was fresh and just had the head rebuilt but not installed when I got it. assembled it and it would start and die within a few seconds, after a bit of research I ended up unplugging the tps and it stayed running so I installed a new one. started fine took it for a drive and all seemed well until it went to shift 2-3, it just hung at like 4200 rpm, I let off the throttle a bit and it shifted but wouldn't accelerate much more. It felt like it wasn't advancing timing or it was pulling timing, so I stated swapping sensors including:
tps
cam angle sensor in the distributor
map
mat
coolant temp in the t-stat housing
fuel pressure regulator
and finally crank position sensor.
have tested the fuel pressure and flow. will flow over 1 gpm, and will get to 90 psi.
Still no power up top. so I thought maybe it had to do with tire size (32") so installed a ford 8.8 with 4.10's and regeared the front. not really any change.
could I have screwed up the cam timing? (idles and accelerates smooth) or could the pcm be bad?
I bought a 95 Cherokee 4.0 auto.
Engine was fresh and just had the head rebuilt but not installed when I got it. assembled it and it would start and die within a few seconds, after a bit of research I ended up unplugging the tps and it stayed running so I installed a new one. started fine took it for a drive and all seemed well until it went to shift 2-3, it just hung at like 4200 rpm, I let off the throttle a bit and it shifted but wouldn't accelerate much more. It felt like it wasn't advancing timing or it was pulling timing, so I stated swapping sensors including:
tps
cam angle sensor in the distributor
map
mat
coolant temp in the t-stat housing
fuel pressure regulator
and finally crank position sensor.
have tested the fuel pressure and flow. will flow over 1 gpm, and will get to 90 psi.
Still no power up top. so I thought maybe it had to do with tire size (32") so installed a ford 8.8 with 4.10's and regeared the front. not really any change.
could I have screwed up the cam timing? (idles and accelerates smooth) or could the pcm be bad?