PE89095 · PE
EQUIPMENT Investigation
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Vehicle report
1987 JEEP CHEROKEE
Defect investigations
3 actionsEA88025 · EA
VEHICLE SPEED CONTROL:LINKAGES Investigation
ANALYSIS OF INFORMATION FROM MANUFACTURER:THE MULTI-POINT INJECTIONSYSTEM (MPI) USED ON THE SUBJECT VEHICLES HAS HAD WIRING HARNESS FAILUREAND FAILURE OF THE CRANK POSITION SENSOR (CPS).BOTH FAILURES HAVE A HIGHFREQUENCY AND ARE THE SUBJECT OF JEEP TASK FORCES.NUMEROUS MODIFICATIONSTO BOTH ITEMS HAVE BEEN MADE.ANALYSIS:THE STALLING PROBLEM IS SEMI-INTERMITTENT, THAT IS WIRINGHARNESS FAILURE IS MOST LIKELY TO OCCUR UNDER THOSE CONDITIONS WHERE THEHARNESS IS DISTURBED (CORNERING AND ROUGH ROAD).CPS FAILURE CAN OCCUR ANYTIME, BUT FAILURE APPEARS TO BE ACCENTUATED BY HIGH UNDERHOOD TEMPERATURES(EXHAUST MANIFOLD LEAKS, ETC.) AND DISTORTION OF THE CPS HOUSING FROMEXHAUST HEAT DAMAGE OR THERMAL FLEXING.BOTH CONDITIONS RESULT IN NOSIGNAL.STATUS:RECOMMEND OPENING EA AND SENDING A MORE REFINED IR.===
PE87048 · PE
VEHICLE SPEED CONTROL:LINKAGES Investigation
SUMMARY OF INFORMATION FROM MANUFACTURER:THE FUEL INJECTED 6 CYLINDER(242 CID) IN-LINE ENGINE IS APPARENTLY NEW TO THE INSTALLATION INTO THEJEEP CHEROKEE.ANALYSIS:THE FUEL INJECTED ENGINE ALLEGEDLY STALLS WHILE THE VEHICLE ISCRUISING AT HIGHWAY SPEEDS (35-55MPH).TWO FAILURE MODES HAVE BEENIDENTIFIED, STALLING WHEN CORNERING OR GOING OVER A BUMP AND THE OTHERIS ENGINE STALL WHILE CRUISING--USUALLY IN HIGH AMBIENT TEMPERATURESITUATIONS.JEEP HAS IDENTIFIED A PROBLEM WITH THE EXHAUST MANIFOLDGASKET FIT TO THE CYLINDER HEAD WHICH AFFECTS THE HIGH TEMPERATUREPERFORMANCE OF THE CPS (CRANK POSITION SENSOR/ENGINE SPEED SENSOR)MODULE. CHRYSLER/JEEP HAS A TASK FORCE TO STUDY THE PROBLEM.STATUS:CRECOMMEND CLOSING THIS PE AND CONTINUING THE ANALYSIS IN AN EA.#===
Reading this report
Complaint counts are reports filed with NHTSA, not failure rates. A common model collects more of them than a rare one that breaks more often.