1ST THINGS 1ST
HERE'S THINGS TO LOOK AT
EVEN THOUGH YOU MAY HAVE NOT HAD SPARK BEFORE YOU CHANGED THE COILDID THE PARTS STORE FELLER INSURE YOU GAVE YOU THE RIGHT COIL,"PRESTOLITE IGNITIONS ('76-'78) USE A DIFFERENT COIL THAN A MOTORCRAFT IGNITION ('79-'86) IF NOT, CALL THEM BACK AND GIVE THE PART NUMBER TO THEM AND VERIFY--OR MAYBE WE COULD LOOK IT UP ON THEIR SITE (PART NUMBER, FROM WHERE?)......THIS IS THE REASON: IF YOU HAVE THE WRONG ONE, IT WILL COMPLICATE THIS PROCESS EVEN MORE! THE ONE BELOW IS FOR A '77 W/ PRESTOLITE
http://www.autozone.com/autozone/parts/Duralast-Ignition-Coil/1977-Jeep-CJ5/_/N-in9a2Z9n80r?counter=0&filterByKeyWord=coil&fromString=search&itemIdentifier=111849_0_6007_
NOW BACK TO THE ACTUAL BEGINNING PROBLEM----NO SPARK!
THERE'S USUALLY 3 COMMON POSSIBILITIES (THE ARE OTHER UNCOMMON ONES TOO)----IF YOU HAVE PRESTOLITE IGNITION, "COMMON-VERY COMMON"
1) BAD MODULE (PRESTOLITE OR MOTORCRAFT)---LET ME EXPLAIN TO YOU HOW TO "HANDLE" GETTING A NEW ONE---MINE WENT BAD AT LEAST 5 TIMES!
SEE MY ANSWER FEB 17 (#4 TOWARDS BOTTOM) AT THIS POST
https://www.2carpros.com/questions/1984-jeep-cherokee-cj7
THIS WHAT IT LOOKS LIKE
http://www.autozone.com/autozone/parts/1977-Jeep-CJ5/Ignition-Control-Module/_/N-in9a2Z9n80t?filterByKeyWord=ignition+module&fromString=search
2) IF YOU HAVE A PRESTOLITE DISTRIBUTOR (NORMALLY ON '76 -'78) IT IS NOT DESIGNED WELL, AND WAS REPLACED W/ A MOTORCRAFT SYSTEM LATER IN 1979
THINGS THAT GO WRONG
REMEMBER FROM ABOVE--THE MODULE IS ALREADY A PROBLEM IN THE SYSTEM
A) THE WIRES INTO IT ARE SOLID COPPER WIRES AND A SMALL GAUGE. IF THEY ARE ALLOWED TO MOVE/ BOUNCE AROUND THEY WILL EZily BREAK.
B) THE "PICKUP" INSIDE THE DISTRIBUTOR CAN GO BAD ALSO
THERE'S ONLY 2 WIRES, A CONTINUITY TEST WILL VERIFY WHETHER A & B ARE STILL INTACT AND GOOD TO GO......SEE 1ST 3 PICS AT THE BOTTOM (PRESTOLITE DISTRIBUTOR ONLY HAS 2 WIRES, MOTORCRAFT HAS 3, ONE IS A GROUND)
+++++++FROM HERE DOWN ARE PROBLEMS, BUT THE JEEP WILL HAVE SPARK AND WILL RUN
C) THE VACUUM ADVANCE "AIR BLADDER" (FOR LACK OF CORRECT NAME) THAT IS UNDER TH PLASTIC FRONT WHERE THE VACUUM LINE CONNECTS ON WILL DEVELOP CRACKS AND HOLES (INTERNAL) THIS RESULTS IN...A VACUUM LEAK, AND NO ADVANCE VIA VACUUM (STILL RUNS, NO ECONOMY)
D) THE VACUUM ADVANCE PICKUP ASSEMBLY GETS WORN AND WILL NOT SLIDE WHEN IT IS SUPPOSED TO BE ACTUATED
E) INSIDE THE BODY, IS THE "MECHANICAL ADVANCE" I HAVE HAD THE SPRINGS BREAK MULTIPLE TIMES ON THE WEIGHTS AND THEY STAY "THROWN OUT". THIS WILL ADVANCE THE TIMING, IT WILL STILL RUN AND SOUND GOOD AT IDLE. IF YOU HOOK UP YOUR TIMING GUN, YOU WILL BE FOOLED INTO THINKING YOUR TIMING IS OFF FROM WHAT YOU SET IT AT BEFORE---THE 1ST THING YOU WILL DO IS RESET THE TIMING......NOW IT IS RIGHT ON THE TIMING MARKS (LOOKS RIGHT!) BUT AS YOU GIVE IT GAS, IN EITHER SITUATION---IT WILL NOT ADVANCE (OR RETARD)......WHETHER YOU DON'T FIND THIS OR MIS-CORRECT IT BY RESETTING THE TIMING.......IT STILL RUNS, YOUR POWER AND "GET UP AND GO", AS WELL AS MPG SUFFER....YOU WILL NOTICE YOUR JEEP SUDDENLY HAD A CHANGE..........I CAN EXPLAIN HOW TO FIND A PROBLEM WITH EITHER ADVANCE USING THE TIMING LIGHT AS A TEST TOOL.
EVERY TIME I HAD ONE OF THESE PROBLEMS WITH THE PRESTOLITE SYSTEM, NOT ONLY WAS I PIZZED OFF, BUT THEY ALWAYS SEEMED TO HAPPEN AT THE WORST OF TIMES, AND I HAD TO LEARN ALL OF THIS BY TRIAL AND ERROR, AS I WENT, DOWN TIME WAS NOT GOOD, THIS JEEP IS MY PRIMARY RIDE.....I HOPE MY EXPERIENCES HELP YOU!
I FINALLY GOT SMART, I SWAPPED THE PRESTOLITE FOR A MOTORCRAFT SYSTEM.....MOTORCRAFT HAS STRANDED WIRES, THE MODULE IS MORE RELIABLE (EZ TO FIND THE SAME ONE AT AN AUTO SALVAGE YARD ON '80s FORD CARS...THE BLUE ONE, WHERE THE WIRES COME OUT), I HAVE NOT HAD A SPRING PROBLEM (YET), VACUUM ADVANCE IS RELIABLE
LUCKILY I HAVE A GOOD STANDING AT THE PARTS STORES. THE PREVIOUS PRESTO DISTs WERE THE SAME PRICE AS THE MOTORCRAFT, AND HAD A LIFETIME WARRANTY, I BOUGHT IT THERE....THEY SWAPPED ME EVEN
SAME WENT FOR THE MODULE
THIS IS THE COST OF A REMAN (PERFECTLY AS GOOD AS A NEW ONE) AND LOOK AT THE WARRANTY!
http://www.autozone.com/autozone/parts/Cardone-Reman-Distributor/1979-Jeep-CJ5/_/N-imcn1Z93xku?counter=0&filterByKeyWord=DISTRIBUTOR&fromString=search&itemIdentifier=768895_76774_0_
THIS IS THE MODULE THAT GOES WITH IT--LOOK AT THAT WARRANTY!
http://www.autozone.com/autozone/parts/Duralast-Ignition-Control-Module/1979-Jeep-CJ5/_/N-imcn1Z9n80t?counter=0&filterByKeyWord=ignition+module&fromString=search&itemIdentifier=118422_300759_5526_
I KEEP A SPARE FUEL PUMP, COIL, AND MODULE IN MY JEEP....SINCE DOING SO I HAVE HAD NO NEED FOR THEM.....2 OTHER CJs ON THE ROADSIDE GOT GOING WITH THE FUEL PUMP AND MODULE, WHICH THEY PAID ME FOR, AND I REPLACED THEM
THE ONLY THINGS STILL NEEDED TO SWITCH OVER, IS A FEW WIRES W/ CONNECTORS OUT OF A '80s FORD, THE COIL CONNECTOR FROM AN 80s CAR OR TRUCK OUT OF THE AUTO SALVAGE YARD, SOME WIRE BUTT SPLICES, 1/2 WRENCH, TAPE MEASURE, LONG FLAT SCREWDRIVER.....DWELL/ TACH METER, AND A TIMING LIGHT!....LAST ITEMS, A "BALLAST RESISTOR",
http://www.autozone.com/autozone/accessories/Accel-1-82-Ohm-resistance-value-ignition-ballast-resistor/_/N-25rh?itemIdentifier=253187&_requestid=295326
AND A COIL FOR A '79 CJ
http://www.autozone.com/autozone/parts/Duralast-Ignition-Coil/1979-Jeep-CJ5/_/N-imcn1Z9n80r?counter=0&filterByKeyWord=coil&fromString=search&itemIdentifier=111930_0_5526_
IF YOU DON'T WANNA SWAP OVER...........AND DETERMINE THAT THE DISTRIBUTOR IS BAD....IF YOU KNOW WHAT YOU ARE DOING, DISREGARD THIS, IF YOU WANT TO MAKE THIS GO SMOOTH....LEAVE THE DISTRIBUTOR IN, DO NOT LOOSEN OR MOVE IT.
GO AHEAD AND GET THE REPLACEMENT PRESTOLITE DISTRIBUTOR, DO NOT WORRY ABOUT THE "CORE CHARGE" YET (ALWAYS KEEP ANY CORE, UNTIL YOU ARE SATISFIED THE SYSTEM IS FIXED)
THEN LET ME KNOW YOU ARE READY, I CAN HELP YOU GET IT INSTALLED THE QUICK EZ WAY......INSTEAD OF HAVING TO GO THRU THE "TOP DEAD CENTER" ON "COMPRESSION" STROKE WAY (THE HARD WAY)
KEEP ME POSTED, THESE ARE THE MOST LIKELY POSSIBILITIES, IF TESTING PROVES ALL IS GOOD, SO FAR, WE WILL DIG DEEPER
NEED TO KNOW VOLTAGE AT POSITIVE SIDE OF THE COIL, BEFORE YOU DO THE STUFF IN THIS STUFF, IN THIS ANSWER.......IF THESE IS NO VOLTAGE, WE MUST CHECK SOME OTHER STUFF.....REMEMBER GOOD BATTERY, WITH THE KEY "ON"
YOUR ANSWERS/ TEST RESULTS/ QUESTIONS----INPUT?
THE MEDIC
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Friday, January 13th, 2012 AT 6:45 AM