Mechanics

JEEP WRANGLER DISTRIBUTOR PROBLEM

1987 Jeep Wrangler • 120,000 miles

Have a dead miss at 1500 rpm while driving down the road. Have rebuilt carb, changed intake/exhaust gasket, and have a new icm?
Avatar
Jstat
September 25, 2012.



Scan for codes a and check for a vacuum leak. Then try to short out a cylinder one at a time to find out which one it is then check compression. If that's ok then check for bent pushrods/rocker arm problem etc.


Hmac300
Sep 25, 2012.
LAST TIME WE DID A FULL 100% TUNE UP?

GOT A REPAIR MANUAL?

WHAT'S NOT EXACTLY LIKE IT WAS...UNDER THE HOOD....LET'S SAY IN EARLY 1988?

POSSIBLE IGNITION MODULE ISSUE?

http://www.2carpros.com/questions/1977-jeep-wagoneer-77-360-begun-dying-random-only-happens-on-longer-drives-say

HERE'S ONE TO LOOK THRU WHEN YOU AIN'T DOIN' NOTHIN'.....I'M PRETTY SURE A WRANGLER IS IN IT TOO

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

I CAN LINK YOU TO OTHER POSTS, IF YOU ARE INTERESTED CONCERNING A "NUTTER BYPASS" AND BASICALLY MAKING UNDER THE HOOD, CLOSER TO A CJ.....SORTA ELIMINATING THAT PESKY SO CALLED COMPUTER

ARE YOU EMISSIONS TESTED IN YOUR REGION, THIS MAY NOT MATTER IF THEY "GRANDFATHER" OLDER STUFF ON THRU WITH JUST A SAFETY INSPECTION

PICS BELOW ARE OF AN EXAMPLE OF, "THAT LOOKS FINE"....but it really ain't!

CORRODED COIL CONNECTION ON CAP---IT LITERALLY HAD TO BE "BROKEN" OFF OF THE CAP......NOT TO MENTION HOW GOOD THIS CONNECTION STILL WAS (IT STILL RAN PERTTY DARN GOOD).....THE PICS WERE AN AFTERTHOUGHT, I SORTA STUCK IT BACK IN PLACE FOR THE 1ST ONE (YOU CAN SEE THE POWDER, THAT WAS NOT THERE WHEN I INITIALLY MAN-HANDLED IT)

THIS "LET IT GO ATTITUDE" IS EXACTLY WHY SCHEDULED MAINTENANCE IS IMPORTANT.......A "TO DO" LIST FOR DUMMIES!

http://www.2carpros.com/questions/2007-ford-taurus-tune-up

KEEP US POSTED (OR YOU CAN TELL ME TO GO AWAY)

THE MEDIC


Tiny
CJ MEDEVAC
Sep 25, 2012.
I'm going to pull the ignition module and have it tested, it's new but it definitely acts as if it stops firing. I replaced the distributor, wires and plugs. If the ICM gets 3 passes i'm pulling the valve cover. Also if you get on passed the miss about 300 rpm it wil smooth back out!


Tiny
Jstat
Sep 28, 2012.
PONDER THESE

CORRECT OEM TYPE PLUGS?....NOT SOMETHING "HIGH SPEED" YOUR PALS SUGGESTED?....RIGHT GAP?

WIRES ARE THE CORRECT FIRING ORDER?

POSITIVE THE DIST DROPPED BACK IN CORRECTLY?

LOOKED FOR VACUUM LEAKS?

YOU HAVE SET THE TIMING CORRECTLY....WITH VACUUM ADVANCE VACUUM LINE TO THE DISTRIBUTOR PLUGGED OFF, WHILE YOU DID THE TIMING?

IDLE SPEED WAS BY THE BOOK WHILE YOU TIMED?

RECONNECTED WHEN FINISHED?

RESET IDLE SPEED AFTER TIMING WAS DONE?

YOU HAVE "TWEAKED" YOUR CARB IDLE MIX SCREWS....KEEPING IT AT IDLE SPEED AS YOU WENT?

THEY ARE 100% EVENLY BACKED OUT (LIGHTLY BOTTOMED--THEN BACKED OUT) WATCHING YOUR DWELL METER FOR IMPROVEMENTS AS YOU MOVED THEM, ONE AT A TIME IN SMALL INCREMENTS?

SEE "OCTOBER 25th" IN THIS POST

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

LETS HOLD OFF ON GOING IN, UNTIL WE EXPLORE SOME OF THIS

REMOVE YOUR AIR BREATHER AND GIVE ME SOME (4 OR 5) GLAMOUR SHOTS OF YOUR ENGINE --BOTH SIDES---IN FOCUS--(NOT TEENY TINY PHONE SHOTS) WHEREAS THE ENTIRE ENGINE TAKES UP MOST OF THE PIC (NOT CLOSE-UPS)

EXAMPLE OF A "SHOT" AT BOTTOM. THIS IS ONE OF MANY "I HELPED" THE OWNER WORK ON, AT MY HOUSE...I DON'T NORMALLY DO IT MYSELF, I MAKE THEM DO MOST OF THE WORK, THEY USE MY TOOLS AND I EXPLAIN THE "HOWS AND WHYS"...I DO DEMONSTRATE. MOST LEAVE "KNOWING SOME STUFF" AND HAVE THAT "BANTAM ROOSTER STRUT" WHEN THEY LEAVE. I DO WELL TOO, WHEN THEY ARE USUALLY GRACIOUS AND DONATE TO ME...I DON'T FIX THEM FOR A "SET PRICE". THEY DON'T FULLY FIGURE OUT MY "SCHEME OF THINKIN'" UNTIL THE END OF THE SESSION. I SORTA THINK I MAKE OUT BETTER THIS WAY. I ALSO HAVE CLEANER HANDS!

THE MEDIC


Tiny
CJ MEDEVAC
Sep 28, 2012.
Checked all the things from the last suggestions, and then preformed the nutter bypass. Fixed the problem completely. Thanks for sending me in the right direction!


Tiny
Jstat
Oct 9, 2012.
YOU OWE ME LUNCH!

GLAD YOU GOT IT FIXED

LOOK THRU THE CJ 5 AND CJ 7 FORUMS----THE ONES WITH MEGA RESPONSES ARE FILLED WITH INFO

MORE QUESTIONS. YOU CAN COME BACK TO THIS POST WHENEVER YOU WANT.

THE MEDIC


Tiny
CJ MEDEVAC
Oct 9, 2012.