1988 Jeep yj bucking while driving

Sounds TOO lean.

You could force choke partially shut and try it?

Richen the mixture.

GRIZ

I HAD A WEBER DGEV INSTALLED ON MY CJ 5 PRIOR TO USING THE O2 SENSOR, OFFY INTAKE AND NOW 4 BBL HOLLEY 390

THE ONLY THING I HAD TO GO ON WAS THESE DRAG STRIPPERS OPINIONS AND ATTEMPTING TO "READ MY SPARK PLUGS"

THIS WAS A PROGRESSIVE CARB---ONE BBL UNTIL YOU GOT INTO IT, THEN THE 2ND BBL WOULD OPEN

I HAVE SPENT OVER $200 ON JETS AND CRAP FOR THE DGEV

I STRIPPED OUT 2 OF THE SCREW HOLES ON THE LID TO THE JETS, I WENT IN AT LEAST ONCE A DAY MESSING WITH IT. THE O2 THING MAY COULDA HELPED ME A LOT, IF I HAD KNOWN ABOUT IT

I WANNA KNOW SOMETHING, DOES THIS WRANGLER HAVE A RETURN TO THE TANK LIKE A CJ, USING THE 3 T. IT FUEL FILTER OR SIMILAR? MECHANICAL FUEL PUMP?

THIS IS MY THOUGHT ON YOUR DEAL. WITH INFO I HAVE NOW

ONLY BUCKS AT HIGHER SPEEDS?

AS IF FUEL BOWL IS RUNNING OUT?

FLOAT ADJUSTED RIGHT?

CHECK FUEL PRESSURE STRAIGHT OUT OF THE PUMP--NOT AS IT FLOWS THRU THE SYSTEM. THIS WILL LET YOU KNOW WHAT THE PUMP IS CAPABLE OF

MAKE ABSOLUTELY SURE THAT CRAP HAS NOT ENTERED YOUR REGULATOR, AND HAS IT STOPPED UP (BLOW BACKWARDS THRU IT, OR REPLACE IT IF YOU SUSPECT CONTAMINATION) AND THE K. NOB IS IN THE "POPPED UP" POSITION WHEN YOU HAVE IT SET ON A PRESSURE

HOW DO YOU KNOW FUEL PRESSURE? I HAVE A SMALL FUEL PRESSURE GAUGE ON MINE EVEN THOUGH IT PULSATES, THE HIGHEST IT READS IS THE PRESSURE BEING GENERATED

IF YOU HAVE A RETURN LINE, CAN YOU PINCH IT WITH PLIERS SLIGHTLY, TO BUILD PRESSURE REARWARD FROM IT?

IF THIS WORKS, MAYBE INSTALL A RESTRICTIVE BUSHING SHOVED INTO THE RETURN RUBBER HOSE---FOR INSTANCE, AN EXPENDED.22 CASING DRILLED OUT TO A SPECIFIC SIZE (EXPERIMENT), THAT WILL ALLOW FLOW, BUT BACK-PRESSURE AT THE SAME TIME?

OR EVEN INSTALL A SHORT TUBE YOU CAN SQUEEZE DOWN TO MAKE A SLIGHT PERMANENT RESTRICTION, MESS UP? SIMPLY REPLACE THE SHORT SECTION

OK---SHOOT DOWN MY THEORIES!

TELL ME YOU NEED ALL OF THESE WEBER JETS AT A REDUCED RATE, I SOLD THE CARB TO SOME POOR SOUL LONG AGO

WITH THE HOLLEY, MY STUFF IS AVAILABLE MORE LOCAL

THE MEDIC

I MEANT TO ADD IN--ON BOTH OF MY JEEPS I HAVE THE SAME REGULATOR. ONLY MR. JEEP HAS THE LITTLE INLINE GAUGE.

I FOUND THAT THE REGULATOR IS PRETTY ACCURATE OWN ITS OWN, THE DIALED IN READING IS DARN CLOSE TO THE GAUGE READING.

WITH WILLY, 3.5 PSI IS WHAT THE CARB REQUIRES

IF I TURN THE REGULATOR ANY LOWER, AT HIGHER SPEEDS. IT BUCKS!

WHAT IS HAPPENING IS THE FUEL BOWL IS NOT GETTING ENOUGH FUEL INTO IT. ITS GETTING USED UP FASTER THAN REPLENISHED. THE FLOAT IS DOING NOTHING 'CEPT DANGLING, IN HOPES THAT FUEL WILL RAISE IT UP!

WITH THE BOWL BEING SO LOW, THE FUEL LEVEL IS NOT FILLING THE VENTURIES TO THE PROPER LEVEL. THE FUEL SORTA NORMALLY KEEPS THE VENTURIES REALLY CLOSE TO "SPILLING"---THEN AS AIR (VACUUM) RUSHES BY THE VENTURI THE FUEL "MISTS" FROM THEM (LIKE A PAINT GUN NOZZLE) THIS IS WHERE AIR/ FUEL MIXTURE BEGINS IN A CARB

IF THE FUEL IS LOW IN THE VENTURI----THE RUSHING AIR (VACUUM) HAS A REALLY HARD TIME S. UCKING THE FUEL UP AND OUT OF THE VENTURI.

KINDA THINK OF HOVERING YOUR STRAW REALLY CLOSE TO YOU SOFT DRINK THE S. UCKING THE STRAW---YOU GET SODA!

THEN BACKING OFF A BIT MORE, NOW YOU CAN'T S. UCK HARD ENOUGH TO GET THE SODA INTO THE STRAW

IF YOU PULL THE CHOKE, THAT IS IF YOU HAVE A MANUAL CHOKE! THIS MAY MAKE SUCTION GREATER, AND IT MAY PULL ON THE FUEL A LITTLE HARDER (S. UCKS THE STRAW HARDER) THIS IS NOT A FIX, BUT IF THE BUCKING SORTA SUBSIDES A LITTLE, TAKE IT TO THE BANK, FOR SOME REASON (PUMP, RESTRICTIONS, NOT ENOUGH BACK PRESSURE FROM RETURN LINE, INCORRECT CARB ADJ, ETC.) YOUR BOWL LEVEL IS TOO LOW

THE MEDIC

Mixture should not be different, just workload. Lean is ok withno load but fails undr load.

ONCE YOU GET YOUR JETS MATCHED WITH YOUR NORMAL DRIVING SPEEDS AND THE POWER VALVE SELECTED TO TAKE OVER WHEN THE VACUUM DROPS DOWN (REALLY READ THE "SCIENTIFIC TUNING THING I SENT A LINK TO) YOUR CARB WILL PERFORM SO MUCH BETTER AS FAR AS "AVERAGE AIR FUEL MIX" FOR WHATEVER SPEEDS YOU DRIVE.

BEING THAT A CARB CANNOT MAKE CORRECTIONS OR BE SET TO GIVE A PERFECT MIX WHEREVER YOU HAVE THE ACCELERATOR PEDAL POSITIONED TO, YOU CAN GET IT WORKING AT ITS PEAK IF YOU GET ALL OF THE FACTORS DOING THE BEST THEY CAN DO. WITH THE AIR/ FUEL GAUGE ON YOU WILL SEE "LEAN MOMENTS" AND YOU WILL SEE "RICH MOMENTS". YOU ARE STRIVING FOR IN-BETWEEN (STOICH, OR NEAR THAT) 14.7:1 AIR/ FUEL MIX IS PERFECT.A CARB CANNOT HOLD THAT, A COMPUTERIZED CAR CAN GET CLOSE.

I HAVE MINE JETTED FOR BEST PERFORMANCE AT 55 MPH ON FLAT GROUND. AT 55 MPH THE YELLOW LEDs ARE BOUNCING ALL OVER STOICH

PULLING A SLIGHT HILL, IT GOES RED (LEAN), IF I TOUCH THE PEDAL IT MAY COME BACK TO YELLOW, WHEN I "PEDAL A BIT MORE" THE VACUUM DROPS, THE POWER VALVE KICKS IN AND IT GOES GREEN (RICH)

AS FAR AS AROUND TOWN, IT STAYS RICH MOST OF THE TIME. BUT NOT AS RICH AS DOING THIS BY "WORD OF MOUTH"--IMPOSSIBLE TO READ PLUG CUTS (COLOR)---OUT OF THE BOX (WAS WAY TOO LEAN W/ MY HOLLEY)

I HAVE WENT FROM 15 MPG (BBD JEEP CARB) NOW TO 18 MPG W/ MY 4 BBL HOLLEY. DRIVING SENSIBLY.I TRIED FOR YEARS TO GET PAST THE 15 MPG MARK WITH EVERY GADGET SAID TO HELP, I AM NOW SATISFIED WITH MY RESULTS, THE O2 WAS THE ANSWER TO GETTING THE "BURN" PEAKED OUT. MY ON DASH VACUUM GAUGE ALSO KEEPS YOU AWARE OF THE HEAVY FOOT, KEEPING THE NEEDLE HIGH, KEEPS THE MPG UP!

THE MEDIC

LETS SEE IF ANY OF THIS STUFF AIDS YOU

THIS 1ST ONE IS EXTREME, THERE SHOULD BE ABSOLUTELY NO WOBBLE AT ALL...NOT EVEN A LITTLE

http://www.youtube.com/watch?v=1z2XpvyCknY

WATCH HIS AXLE---IT SHOULD NOT TURN UNLESS THE HUBS ARE LOCKED.....ARE YOURS STUCK IN THE LOCKED POSITION?

BELOW--SEARCH OUT THE BEST VIDEO SIMILAR TO YOUR SET UP THAT YOU HAVE ON THE YJ (I DO CJs, SELDOM MESS WITH A WRANGLER)......USE YOUR REPAIR MANUAL AS "LAW"--VIDEOS MAY NOT BE PERFECT EXAMPLES----HERE'S SOMETHING THAT COULD BE SIMILAR WITHOUT ME WATCHIN' ALL OF THE VIDEOS

USE DIFFERENT SEARCH WORDS, YOU MAY FIND A BETTER VIDEO....SEARCH BOX IS AT TOP OF THE VIDEO.....DON'T FORGET TO LOOK AT THE SUGGESTIONS DOWN THE SIDE OF THE VIDEOS.......WHEN THE "GIRLY ONES" POP UP---STEER CLEAR, YOU WON'T GET YOUR WORK DONE!

http://www.youtube.com/results?search_query=HOW+TO+REPLACE+FRONT+WHEEL+BEARINGS+ON+A+JEEP&oq=HOW+TO+REPLACE+FRONT+WHEEL+BEARINGS+ON+A+JEEP&aq=f&aqi=&aql=&gs_l=youtube-reduced.12...2133.26510.0.29445.45.45.0.30.30.0.237.2110.2j12j1.15.0.

OK THIS ONE IS ABOUT TIE RODS----LOST MOTION SHOULD BE CHECKED ON ALL STEERING PARTS

http://www.youtube.com/watch?v=so0vL-ZOwY8&feature=related

http://www.youtube.com/watch?v=so0vL-ZOwY8&feature=related

I USUALLY GET SOMEONE TO TO TURN THE STEERING WHEEL BACK AND FORTH--LIKE A 1/4 TURN OR SO (THE SLACK AREA) WHILE I WATCH STEERING JOINTS FOR SLOP---EVEN A LITTLE BIT OF SLOP IS TOO MUCH!

REMEMBER "MORRIS 4X4s KNOWLEDGE BASE" HAS YOUR REPAIR MANUAL ONLINE---FOR YOU TO LOOK AT ANY TIME....YEAR CLOSEST TO YOURS SHOULD BE IT

http://www.jeep4x4center.com/knowledge-base/index.htm

KEEP ME INFORMED

THE MEDIC

YA ON THE HUBS----SOMETHING LOCKS 'EM---SEE IF IT COULD BE BROKE OR STUCK. THUS ONE SIDE OF THE AXLE MIGHT TURN, WHEN IT SHOULDN'T

AS FAR AS GETTING RID OF FAMILY MEMBERS (JEEPS)

TALK MOM INTO GETTING RID OF DAD--KEEP THE JEEPS

DAD IS NOT AS SYMPATHETIC IN MOST CASES---MOM IS MORE "WRAPPABLE AROUND YOUR LITTLE FINGER. LEAST THAT WAS THE CASE WHEN I WAS GROWING UP. LOL!

I SORTA STARTED OUT WITH NOTHING, AND STILL HAVE MOST OF IT LEFT!

WE KEPT DAD REGARDLESS, HE WAS A FORD MAN, I WAS NOT ABLE TO GET MY 1ST JEEP TILL I JOINED THE ARMY, WENT THE AIRBORNE RANGER ROUTE, AND WAS FINALLY ABLE TO BUY IT "MY DREAM"."PAP" HAD MORE FUN WITH MY JEEPS THAN HE EVER DID WITH HIS FORDS

PICS ARE MY 1ST (EARLY 1983), 2ND (LATE 1983, #1 T-BONED BY A SEMI AT 45 MPH), OLE WILLY IS #7, MY LATEST DEER STAND SHOT, HE LOOKS LIKE A TOY).I SORTA USED A SIMILAR PAINT SCHEME WHEN I PAINTED #6 CJ5 LIKE THAT OF #1

LET ME KNOW IF YOU NEED MORE ASSISTANCE. AND TELL MOM AND DAD THAT CJ MEDEVAC SAYS HEY. AND NOT TO BE SO HARD ON YOU!

THE MEDIC

. AND?