My '89 Cherokee 4.0L has lacked low end power since I bought it, but it seems to have gotten worse over the past few months.
It has stock 3.07 gears, an AX15, and worn out 235's.
-If you drop the clutch at around 3000 RPM's, it'll simply bog down instead of spinning the tires unless you are on dirt/loose surface.
-If you rev it while in neutral, it'll hesitate before doing it
-Never ever chirps the tires
-When it's cold, it'll stall at the first stop sign every time
-After I let the clutch out and start to really give it some gas, it'll keep the same rpm's for a second and then take off, almost as if it's bogging down but not quite.
-It seems to have OK torque, not a monster by any means like the claims I've heard, but when it reaches 3500 RPM's it seems to get a bunch of more torque, like it just got a bunch of boost
-Runs better when it's hot
-Stumbles at idle. Will occasionally stumble to 500 RPM's and sputter. Holding at 2000 RPM's it sometimes missfires as well.
I've done a full tuneup, replaced the O2 sensor, TPS, checked my MAP sensor and temp sensors. Fuel pressure is good. Engine was rebuilt 70,000 km's ago by PO. Checked for vacuum leaks yet havn't found any. Could these be signs of a worn coil?
On a side note, my Haynes manual says that the voltage going into the bottom of the distributor should be 5 volts, but when I checked mine last it was 7 volts.
Edit: Also where does the signal for the tachometer come from? I notice that sometimes the tach will hang and then jump up a couple hundred RPM's, even though the engine was revving steadily. If it comes from the coil, could it be related?
It has stock 3.07 gears, an AX15, and worn out 235's.
-If you drop the clutch at around 3000 RPM's, it'll simply bog down instead of spinning the tires unless you are on dirt/loose surface.
-If you rev it while in neutral, it'll hesitate before doing it
-Never ever chirps the tires
-When it's cold, it'll stall at the first stop sign every time
-After I let the clutch out and start to really give it some gas, it'll keep the same rpm's for a second and then take off, almost as if it's bogging down but not quite.
-It seems to have OK torque, not a monster by any means like the claims I've heard, but when it reaches 3500 RPM's it seems to get a bunch of more torque, like it just got a bunch of boost
-Runs better when it's hot
-Stumbles at idle. Will occasionally stumble to 500 RPM's and sputter. Holding at 2000 RPM's it sometimes missfires as well.
I've done a full tuneup, replaced the O2 sensor, TPS, checked my MAP sensor and temp sensors. Fuel pressure is good. Engine was rebuilt 70,000 km's ago by PO. Checked for vacuum leaks yet havn't found any. Could these be signs of a worn coil?
On a side note, my Haynes manual says that the voltage going into the bottom of the distributor should be 5 volts, but when I checked mine last it was 7 volts.
Edit: Also where does the signal for the tachometer come from? I notice that sometimes the tach will hang and then jump up a couple hundred RPM's, even though the engine was revving steadily. If it comes from the coil, could it be related?
Last edited: