[img]smileys/smiley17.gif[/img]i HAVE A 99 ISUZU RODEO. ANGINE LIGHT ON. THE COMPUTER READ MIS FIRE ON CYLINDER 4 AND SYSTEM TOO LEAN.THE ENGINE SHOOK LIKE A LAMBADA DANCER. AFTER TRYING JUST ABOUT EVERYTHING ON THE BOOK WHICH INCLUDED:-CHANGING O2 SENSORS (BOTH OF THEM) -TESTING AND CHANGING THE INJECTOR ON CIL 4. -A COMPLETE TUNE UP.-CLEAN THE SYSTEM WITH ADDITIVES. TO THE DESPERATE FEELINGTO THINK TO SELL IT AS JUNK. I TOOK IT TO THE MECHANIC. EVEN HE COULD NOT FIND THE PROBLEM FOR ALMOST A MONTH. HE CHANGED THE PRESSURE REGULATOR (NOTHING), CHECKED COILS (NOTHING), CHECKED INJECTORS (NOTHING) FINALLY:


CHANGED THE FUEL SENDING UNIT WITHIN THE GAS TANK. WHICH ALSO CONTROLS THE AMOUNT OF FUELPRESSURE GIVEN TO THE ENGINE.IT TOOK $1200.00 TO FIX BUT I CAN TELL YOU THIS HAS BEEN ONE OF THE MOST DIFFICULT DIAGNOSTIC I EVER ENCOUNTERED AND SO FOR MY MECHANIC.