Hi,
I have 89 4.0 cherokee with renix. So my chero doesn't start well, also, when it idles the rpms are jumping up and down. It runs around 800 rpm, then it goes to 1000 for 30 seconds, then back. Also when I accelerate, it goes well, but it seems to hang for a second or two. On driveing it starts to jerk, then i have to accelerate or take the leg from the pedal. It jerks quite constantly, but sometimes it doesn't do it.
I have checked/changed:
TPS (adjusted)
MAP (new)
O2 sensor (tested)
Fuel pump (new)
Fuel pressure regulator (tested)
Fuel filter (new)
Vacuum lines (tested)
Spark plugs (new)
Wires (new)
Cylinder pressures (tested, equal)
What to suspect next?
Ignition module?
Coil?
Is there any more sensors to test/check?
ECU?
How to read information from test ports?
How the renix system works?
I have 89 4.0 cherokee with renix. So my chero doesn't start well, also, when it idles the rpms are jumping up and down. It runs around 800 rpm, then it goes to 1000 for 30 seconds, then back. Also when I accelerate, it goes well, but it seems to hang for a second or two. On driveing it starts to jerk, then i have to accelerate or take the leg from the pedal. It jerks quite constantly, but sometimes it doesn't do it.
I have checked/changed:
TPS (adjusted)
MAP (new)
O2 sensor (tested)
Fuel pump (new)
Fuel pressure regulator (tested)
Fuel filter (new)
Vacuum lines (tested)
Spark plugs (new)
Wires (new)
Cylinder pressures (tested, equal)
What to suspect next?
Ignition module?
Coil?
Is there any more sensors to test/check?
ECU?
How to read information from test ports?
How the renix system works?