Mechanics

CJ-5 HAS NO SPARK. WHAT CAN IT BE?

1977 Jeep CJ5 • 85,000 miles

Replaced the ignition coil, rotor, distributor cap, and spark plug wires. Still no spark. Any ideas?
Avatar
Christmanbk
January 12, 2012.



Ooops attached same picture twice. Sorry.


Tiny
Christmanbk
Jan 13, 2012.
OK--THIS MORNING YOU SENT ME A MESSAGE, TO KEEP THINGS UNDERSTANDABLE AT THIS POST. THIS WAS THE "JEEP" PART OF IT: I was thinking this morning about the Jeep. At first my brother was having problems with spark. He replaced the coil, cap, rotor and plug wires and said he had spark. Then he claimed it still wouldn't run, just turn over. I told him to spray starting fluid into the carb to see if it would fire. He said "No, it didn't". Now wouldnt that mean that there is still no spark? Because at that point you are eliminating the fuel system right?

I'M 4 HOURS FROM YOUR RIG--STILL MUCH CLOSER THAN YOU!

I DO NOT KNOW THE ABILITIES OF YOUR BROTHER ON THE OTHER END!

I SORTA NEED SOME INPUT FROM THE 1ST TESTS, "THE DOCTOR" ORDERED, AT THE BEGINNING OF THIS VISIT

IN PARTICULAR ******HOW IS HE TESTING FOR SPARK?***** EXACTLY WHAT HE IS DOING TO TEST FOR IT.

."HAVING SPARK" AND. WHAT IS THE EXACT DC VOLTAGE AT POSITIVE SIDE OF THE COIL ARE TWO DIFFERENT THINGS!

I NEED ACCURATE ANSWERS TO BOTH OF THE ABOVE. THIS IS HOLDING ME UP!

IF WE DO NOT UNDERSTAND WHAT EXACTLY TO DO, I WILL SLOW DOWN AND TEACH YOU FELLERS! OR TALK YOU THRU VIA PHONE COMMO

I AM SORTA OBLIGATED AND COMMITTED NOW: SOUTH CAROLINIAN, BROKE JEEP CJ 5, MILITARY. SORTA "ME" IN 1981

WITHOUT ANSWERS--I MIGHT HAVE TO WRITE A FULL CJ SERVICE MANUAL, TO ACCIDENTALLY STUMBLE ONTO YOUR PROBLEM. WITH ANSWERS, I MAY PINPOINT IT QUICK--OR AT LEAST CONCENTRATE ON THAT AREA MORE

THE "STARTER FLUID THING" OR A LITTLE FUEL----IS THE EZIST "QUICK" TEST TO DETERMINE WHETHER IT IS A SPARK OR FUEL PROBLEM. YOU REALLY ONLY HAVE TO TAKE THE BREATHER TOP OFF

GENERALLY SPEAKING---DOING THAT FUEL TEST IF IT CONTINUES TO "DRY TURN OVER" THERE IS "PROBABLY" NO SPARK----IF IT COUGHS, SPITS AND SPUTTERS, HIT A FEW TIMES, OR BACKFIRES. AT MINIMUM SOME SPARK IS PRESENT AND "I" TEND TO RULE OUT A FUEL PROBLEM

THE ABOVE IS NOT "SET IN STONE", BUT WORKS MOST OF THE TIME

THE OTHER IMPORTANT THINGS I NEED TO KNOW

1) IT RAN FINE---WAS PARKED---NOW TURNS OVER WELL (WILL NOT BUST OFF)---AND DOES NOTHING? DID "SOMETHING", BEFORE IT WAS FOOLED WITH?

2) IF YOU CAN---TELL ME EVERYTHING THAT HAS BEEN FOOLED WITH? WAS THE DISTRIBUTOR ITSELF REMOVED? ADJUSTMENTS, CARB, ALL THE SPARK PLUG WIRES REMOVED. ANYTHING, ALL THE WAY DOWN TO KNEELING AT THE FRONT BUMPER AND PRAYING. ASKING "THE GREAT AIRBORNE RANGER IN THE SKY" TO SEND COMPETENT ASSISTANCE, I.E. "THE BATTALION STALLION"

PLEASE LIST EVERYTHING AND ANSWER MY QUESTIONS.I NEED THE ENTIRE SITUATION, IN ORDER TO FORM A BATTLEPLAN

THE MEDIC


Tiny
CJ MEDEVAC
Jan 13, 2012.
IF YOUR DISTRIBUTOR LOOKS EXACTLY LIKE THIS---NOTE THE PLASTIC FRONT AND IT ONLY HAS 2 WIRES GOING INTO IT......THIS IS A "PRESTOLITE SYSTEM".......(NOT THE NEWER MOTORCRAFT SYSTEM)

http://shop.advanceautoparts.com/webapp/wcs/stores/servlet/product__5630649-P_218_R%7CGRPTUNEAMS____?zoneAssigned=1

THIS IS THE CORRECT COIL---INSURE THE PART NUMBER IS CORRECT (DON'T GO BY "LOOKS") THIS IS FROM ADVANCE AUTO

http://shop.advanceautoparts.com/webapp/wcs/stores/servlet/product_Ignition-Coil-BWD-Select_3050874-P_190_R%7CGRPTUNEAMS_____

THIS IS THE EXACT SAME COIL FROM AUTO ZONE FOR A '77 CJ PRESTOLITE IGNITION

http://www.autozone.com/autozone/parts/Duralast-Ignition-Coil/1977-Jeep-CJ5/_/N-in9a2Z9n80r?counter=0&filterByKeyWord=IGNITION+COIL&fromString=search&itemIdentifier=111849_0_6007_

BELOW ARE OTHER POSTS YOU MIGHT WANT TO LOOK THRU---SOME MAY BE 304s BUT THE THEORY IS MOSTLY THE SAME, I DO USE MY 258 AS AN EXAMPLE IN SOME OF THEM

THIS FELLER HAS CREATED 2 POSTS

http://www.2carpros.com/questions/1980-jeep-cj7-v8-wont-start

http://www.2carpros.com/questions/1980-jeep-cj7-timingtuning-problem-with-a

HERE ARE SOME OTHERS

http://www.2carpros.com/questions/1982-jeep-cj7-ignition-problem-spark-distributor-cap

http://www.2carpros.com/questions/1978-jeep-cj7-need-help-getting-started-start-on-troubleshooting

IF YOU LOOK AT THE CJ 7 FORUM PRESENTLY---THERE ARE ONLY 422 QUESTIONS----10 YEARS OF CJ 7 (1976-1986) COMPARE THAT TO "CHEROKEE" OR ANY OTHER MAKE OR MODEL OF CARS AND TRUCKS!----GOING SORTA BY "PROBLEMS" THE CJ 7 HAS A BETTER TRACK RECORD ON THIS SITE

http://www.2carpros.com/makes/jeep/cj7

NOW LOOK AT CJ 5s.....BEEN AROUND FOREVER (1955-1983)---THERE ARE ONLY 109 QUESTIONS......"JEEP WROTE THE BOOK ON FOUR WHEEL DRIVE".....IT PAYS TO STICK WITH THE VERY BEST!

http://www.2carpros.com/makes/jeep/cj5

I'VE ANSWERED MOST OF THE QUESTIONS OF BOTH FORUMS OVER THE LAST 2+ YEARS. SOME HANG WITH ME A WHILE (SEE RESPONSES)

I LIKE HELPING THE CJs, IT'S REWARDING WHEN YOU HEAR POSITIVE FEEDBACK AND KNOW YOU HAVE SAVED SOMEONE A BUNDLE....AND MAKE A NEW BUDDY FROM TIME TO TIME!

I'LL ATTEMPT A FEW MORE PICS FOR TESTING LATER LATER TODAY (MUST DO MY CHORES NOW)

THE MEDIC



Tiny
CJ MEDEVAC
Jan 13, 2012.
CJ MEDEVAC has done it again! Another Jeep CJ back on the road. We replaced the Ignition Control Module and it fired up and is running like a champ. I want to take the time to thank you sincerley for all the help and all the patience you had with us. For anyone that has a question about Jeeps this is your official site for success. MEDEVAC walked a novice mechanic at best clearly through each step in the troubleshooting process via conference call on the phone to correct a "no spark" issue. Once again MEDEVAC I can't thank you enough and I owe you.


Tiny
Christmanbk
Jan 17, 2012.
WHEN YOU GET BACK TO SC, YOU CAN TREAT ME TO A SACKFUL OF KRYSTAL BURGERS. NO MUSTARD. NO PICKLE. CHEESE. ONION. MAYO!

THE CLOSEST ONE TO ME IS ABOUT 50 MILES, THE NEXT 70 MILES

SPEAKING OF MAYO---I KNOW YOUR BROTHER IS SENDING YOU A JAR OF "DUKES", AT MINIMUM, A JAR A MONTH?

GLAD IT IS RUNNING. AS IT SHOULD ALWAYS DO!

HAVE YOU CHECKED OUT THE OTHER MODIFICATION ALBUMS?

GET BACK WITH ME, I'LL SEND YOU THE WIRE DIAGRAMS THAT I IMPROVED BY COLORING THE WIRES. I'M GONNA ALSO TRY TO MAKE A DIAGRAM OR TWO ON SWAPPING OVER THE PRESTOLITE SYSTEM TO THE "MUCH BETTER" AND FEW HEADACHES MOTORCRAFT DISTRIBUTOR AND MODULE. I WANT THE DIAGRAM FOOL PROOF AND INCLUDE REAL PICS OF THE WHAT IS NEEDED FROM THE SALVAGE YARD. EVEN A SPARE MOTORCRAFT MODULE MIGHT STILL BE FOUND AT ONE FOR FREE OR A BUCK OR TWO. THEN ALL YOU HAVE TO DO IS SWAP YOURS FOR A TEMPORARY "REAL WORLD TEST" (THAT IS ONCE YOU DO UPGRADE)MOST UNFORTUNATLY, MOST OF THE AMC CARS ARE GONE, OR HAVE BEEN CRUSHED, SO A CHEAP PRESTOLITE SPARE IS HARD TO COME BY!

EVEN IF YOU DO NOT SWAP--DO LIKE I DID--HAVE A SPARE DISTRIBUTOR COMPLETE (ROTOR BUTTON AND CAP), MODULE, AND FUEL PUMP IN THE JEEP AT ALL TIMES! WHEN I UPGRADED, I SWAPPED MODULES, AND TOOK OUT THE "SUBSTANDARD PRESTOLITE DIST"---I CAN TRUST THE MOTORCRAFT DIST A LOT BETTER.

ONCE YOU HAVE THE EZ REMOVAL AND INSTALL METHOD, YOU CAN CHANGE THE DIST 5 MINUTES TOPS AND MAKE IT GO, ON THE SIDE OF THE ROAD, WITH ONLY A 1/2 WRENCH, UNTIL YOU CAN TWEAK THE TIMING IN PERFECT, ONCE YOU GET HOME TO YOUR TIMING LIGHT. THERE'S ONLY ABOUT 3 THINGS YOU MUST REMEMBER. BEFORE YOU SNATCH IT OUT! THIS KEEPS YOU FROM FINDING "TDC"

I APPRECIATE THE COMPLIMENTS. EVEN IF THEY'RE FROM A MARINE! LOL!

KEEP IN TOUCH

THE MEDIC


Tiny
CJ MEDEVAC
Jan 17, 2012.
I SORTA GOT A LITTLE CARRIED AWAY WITH THE PRESTOLITE SYSTEM VS: THE MOTORCRAFT IGNITION SYSTEM

'76-'78 USED PRESTOLITE---AND EVEN CJ5s EARLIER THAN THAT

'79 THEY CHANGED TO MOTORCRAFT

THE PRESTOLITE SYSTEMS DID NOT USE A "RESISTANCE WIRE" IN THE "RUN" WIRE. SO THE COIL HAD AN INTERNAL RESISTOR

MOTORCRAFT DID USE A "RESISTANCE WIRE". SO THE COIL USED WAS "FOR EXTERNAL RESISTOR ONLY"

WHEN CONVERTING OVER TO THE MOTORCRAFT, I INSTALLED A "BALLAST RESISTOR" ON MINE. TAKING THE PLACE OF THE "MISSING/ NON-EXISTENT" "RESISTOR WIRE" ON '79 ON UP

I MIGHT COULDA STUCK WITH THE OLD COIL, AND LEFT OUT THE BALLAST RESISTOR, BUT I FIGURED IF I UPDATED THE SYSTEM TO '79. UP DATE IT ALL. BESIDES, IF THE BALLAST RESISTOR DOES BURN OUT, I CAN TEMPORARILY JUMPER WIRE ACROSS THE CONNECTORS (PROVIDING FULL VOLTAGE) TO LIMP MR. JEEP IN.

BELOW IS WHAT A BALLAST RESISTOR LOOKS LIKE, IT JUST LOWERS 12V TO ABOUT 7.5 VOLTS FOR LONGEVITY.

"I" TERMINAL ON THE SOLENOID PROVIDES "FULL BATTERY VOLTAGE" WHILE THE KEY IS IN THE START POSITION, TEMPORARILY NOTHING GETS HURT IF IT IS SUPPLIED WITH FULL BATTERY VOLTAGE, JUST TO LIMP YOU IN USING A JUMPER

1ST PIC IS ACTUALLY ON MY WILLYS JEEP (EXACTLY, AS ON MY 1977 CJ 5)

2ND PIC IS A "PIGGYBACK" FOR BYPASSING THE BALLAST RESISTOR--A JUMPER WIRE WILL DO THE SAME THING

3RD PIC IS THE INPUT WIRE MOVED, IT NOW PIGGYBACKS THE OUTPUT TERMINAL (OR YOU CAN JUST SAY THAT I HAVE CONNECTED THE WIRES)

ON THE BACKSIDE OF THE BALLAST RESISTOR IS A COIL OF RESISTANCE WIRE BETWEEN THE TWO MALE CONNECTORS. SOMETIMES (VERY SELDOM) THEY BURN UP OR JUST SHAKE AND BREAK. THE "PIGGYBACK THING" WILL GET YOU IN, TILL YOU CAN REPLACE IT.

THE RESISTANCE (BALLAST OR RESISTANCE WIRE) IS IN THERE TO KEEP FROM BURNING OUT THE MODULE/ COIL WITH PROLONGED FULL BATTERY VOLTAGE

THE MEDIC


Tiny
CJ MEDEVAC
Feb 23, 2012.
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