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LS 400 WASTE OF TIME/MONEY

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  • Lexus Model
    92 LS400,2005 LS430

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  1. We have a 92LS400 since new with 116,000miles.At first it had an obvious misfire up to 3000rpm and lack of power.It may of seemed to clear up because it has 8 cylinders.Heres a list of the things I have done.REPLACED CAPS,ROTORS(Lexus parts)NGK PLATINUM PLUGS and NGK WIRES,FUEL PUMP AND FILTER 8K AGO,CLEANED THROTTLE BODY CARBON,CLEANED IDLE AIR CONTROL STEPPER MOTOR CARBON BUILDUP AND POWERED UP TO CHECK STEPPING IN BOTH DIRECTIONS, TESTED BOTH COILS RESISTANCE,CHECKED TROUBLE CODES,FIRST,AND CODES 25&26 CAME UP MEANING RUNNING RICH AND LEAN.LISTENED TO INJECTERS WITH ELECTRONIC STETHASCOPE,TWO HARD TO GET TO UNDER THROTTLE BODY BUT STILL HEARD CLICKING.HAVE 3M FUEL INJ. CLEANING KIT WHERE YOU TAP DIRECTLY INTO FUEL RAIL,DISCONNECT FUEL PUMP FUSE OR RELAY,PLUG RETURN LINE AND RUN OFF FUEL INJ. CLEANER.COULDN,T FIND 3M CLEANER BUT NAPA CAN FIT MY HOSE KIT AND TRIED TWO CANS.LOTS BETTER BUT STILL MISFIRE BUT SOME WHAT DRIVEABLE BUT NOT RIGHT.USED TO SHAKE BAD WHEN YOU LET FOOT OFF BRAKE.DID FUEL PRESSURE TEST AND GOT 39PSI AT IDLE,JUMPED UP TO AROUND 46 WHEN REVED AND JUMPED UP TO 48 WHEN VACUUM LINE ON FUEL PRESSURE REGULATOR IS DISCONNECTED.FUEL PRESSURE DROPPED TO 25PSI AFTER SETTING FOR ABOUT AN HOUR AND DROPPED TO 8PSI OVERNIGHT.IS THAT NORMAL?I ORDERED A CAN OF 3M INJ. CLEANER AND THE MAJORITY OF IT CAME OUT OF THE CAN AS SOON AS I TURNED THE VALVE ON THE CAN HOSE MAKING ME THINK AN INJECTOR WAS STUCK OPEN LEAKING AND FLOODING THE CYLINDER.IT WOULD NOT START SORT OF CONFIRMING THIS.I RECONNECTED FUEL PUMP AND RAN ENGINE A LITTLE.RE-TRIED INJ. CLEANER AND ENGINE STILL WOULDN'T START BUT VERY LITTLE LEFT IN CAN.RECONNECTED FUEL PRESSURE GAGE,RESTARTED ENGINE AND IT STARTED FINE.IDLES ALMOST PERFECT BUT CAN FEEL A MINOR SHAKE AT IDLE.REVS WITHOUT MISFIRE BUT POWER SEEMS WEAK AND WHEN YOU PUT IT IN GEAR IT BARELY HAS ENOUGH POWER TO GET MOVING,WAY WORSE THAN WHEN I STARTED,BUT NO APPARENT MISFIRE.ACTS LIKE TIMING IS AFTER TDC OR SOMETHING.VACUUM SEEMS STRONG BUT NEVER PUT GUAGE ON IT.ANYWAY TO SHUT OFF EACH INJ. AND CHECK PERFORMANCE CHANGE AND HOW LONG SHOULD IT HOLD FUEL PRESSURE BEFORE DROPPING TO ZERO.PLEASE HELP AS THEY HAVE LONG SINCE RETIRED AND NOW ARE ON SOCIAL SECURITY.HAVE SPENT HOURS AND HOURS RESEARCHING THIS ONLINE AND ONE PERSON WANTS TO SELL THEIRS AS THEY SPENT OVER 3K AND HAVEN'T SOLVED THE PROBLEM.THANKS DUANE
  2. You have me confused.Fuel filter is in front of left rear wheel,pump is in tank, where is the resister?
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