DAZZX

Is it normal for the Ls400 to jerk at 40mph after oxygen sensor replacement? It finally leveled out.

DID YOU CHANGE THE CATS AND O2 SENSORS

OK TO GET THE MIDDLE BOLT. HERE IS WHAT YOU NEED TO DO. GET SOME LIQUID WRENCH, SOME LEATHER , DUCK TAPE AND SOME GREASE. NOW WRAP THE LEATHER AROUND YOUR FOREARM WITH DUCKTAPE. NOW GREASE UP THE LEATHER FRONT AND BACK(HANDS INCLUDED) REAL GOOD . THEN GRAB A 19 MM SOCKET. WRAP IT TO YOUR PALM WITH THE DUCK TAPE.OH SPRAY THE LIQUID WRENCH FIRST ON THE EGR VALVE. LET IT RUN DOWN THE VALVE ONTO THE CLAMP AND BOLT.SPRAY A LOT. GRAB YOUR 12MM WRENCH AND PUT IT ON THE BOLT BOX END. NOW BANG THE HELL OUT OF IT.THE BOT WILL BREAK FREE. YOUR HOME SWEET HOME AFTER THAT. OH AND YOU CAN GET THE BOTTOM 2 BOLTS WITH SOME LIQUID WRENCH ALSO. I HAD TO REMOVE THE THROTTLE CABLE BRACKET ALSO.THE TOP 2 BOLTS ARE EASY. NOW HAVE YOUR SELF A BEER. YOU JUST SAVED 400 DOLLARS ON LABOR.

Ok thanks. Thanks to everyone thatr heped me out. i'll let you'll know the results.

They don't do o2 test in Georgia. They do a 50/15 test and a 25/25 test. I think that 25/25 means a 25 pound load at 25 mph.Ok the cat on the passenger side is the original. plus all 4 02 sensors are the original. I might be running rich and lean. Is that possible.The high carbon buildup I saw leading down into the intake manifold looked 1 inch thick.I took a flash light and shined down in some of the sparkplug holes.All I could see was black.How could this be helped?

OK I MIGHT BE RUNNING LEAN

HIGH MY 1993 LS400 FAILED EMISSIONS TWICE. HC-PPM FAILED NOX PPM FAILED. BOTH FAILED THE 25/25 TEST BOTH TIMES. HERE ARE MY READINGS SO YOU GUYS CAN HELP ME. FIRST TEST 25/25 ALLOWED HC-PPM 126/103 CO .23/57 NOX PPM 808/712 CO+CO2 14.3 SECOND TEST 25/25 ALLOWED HC-PPM 121/103 CO .24/57 NOX PPM 858/712 CO+CO2 14.6 BEFORE THE SECOND TEST, I REMOVED AND CLEANED THE PLENUM, THROTTLE VALVE AND EGR VALVE OF CARBON. THEN LATER AFTER REASSEMBLY I SEAFOAMED IT TO DEATH.OK WHEN I PUT MY HANDS WITH GLOVES ON OVER THE TAILPIPES THE ENGINE DIDN'T STUMBLE ,PLUS IT WAS SUCKING IN MY GLOVES.I HAVE NO CHECK ENGINE LIGHT. NO CODES ON THE DASH. WHEN I FIRST ACCELERATE TO 1000 TO 1500 RPM AT TAKE OFF, I NEARLY HAVE TO PUSH THE GAS PEDDLE HALF WAY IN. DO I HAVE BAD CATS OR O2 SENSORS? AM I RUNNING RICH OR LEAN. PLEASE HELP IT'S MY WORK CAR!!! IT HAS 32O K MILES ON IT. BOY I HATE GEORGIA EMISSIONS DAZZX