1991 Jeep Cherokee wont start


Electrical problem
1991 Jeep Cherokee 6 cyl Four Wheel Drive Automatic 208000 miles

I have a 1991 jeep cherokee and wnat its doing is when I start it, it turns over and it sounds like it wants to starts but it also sounds like its trying to start on a few cylinders and when I check for spark its onyl sparking on a few plugs. I've replaced the CPS and the whole distributor and its doing the same thing so I went and turn the key on and off 3 times and the engine light gave me a cod 12, and 55.
what could be the problem?

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have the same problem?
Sunday, July 4th, 2010 AT 4:22 PM

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Attempt to clear the codes-see below

Diagnostic Trouble Codes - 1991
11 Ignition reference signal.
12 Number of key-ons since last fault.
13 Fault in the map sensor pneumatic circuit.
14 Fault in the map sensor electrical circuit.
15 Fault in the vehicle speed sensor circuit.
16 Battery input sense.
17 Engine running too cool.
21 Problem in the oxygen feedback circuit.
22 Fault in the coolant temperature sensor circuit.
23 MAT temperature sensor.
24 Fault in the throttle position sensor circuit.
25 Fault in the AIS motor drive circuit.
26 Injector n peak current.
27 Fault in injector driver interface circuit.
31 Purge solenoid circuit.
32 EGR solenoid circuit.
33 Fault in air conditioning cutout relay circuit.
34 S/C solenoid circuits.
35 Fault in fan relay circuit.
36 Wastegate solenoid circuit.
37 PTU solenoid circuit.
41 Fault in the charging system or no field current.
42 Fault in the ASD relay driver circuit.
43 Fault in ignition coil control circuit.
44 Battery Temp Voltage.
45 Overdrive solenoid.
46 Battery voltage is too high.
47 Battery voltage is too low.
51 Lean condition is indicated.
52 Rich condition is indicated.
53 Internal problem in module.
54 Fault in the distributor high data rate pickup circuit.
55 Completion of fault code display.
62 Unsuccessful attempt to update EMR mileage.
63 Unsuccessful attempt to write to an EEPROM location by the controller.
76 Fuel pump resistor by-pass relay circuit

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Sunday, July 4th, 2010 AT 4:27 PM

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