POORLY RUNNING ENGINE AT ALL RPMS

[JOKERSWILDCHILD]

SINCE I PURCHASED THIS 93 240SX I RAN GREAT AND WAS A FUN DRIVER AND AFTER ABOUT 2 WEEKS ONE MORNING THE CAR JUST WOKE UP ON THE WRONG SIDE OF BED. SOMETIMES WHEN A MOTOR IS RAN WITH A DEAD MISS,AT A CERTAIN RPM THE SITUATION BECOMES NOT SO PREVALANT. THIS SITUATION WITH MY 240 IS AT ALL RPMS. NEVER CLEARS UP AT ALL. MY FIRST PLAN OF ATTACK WAS THE USUAL COMPLETE TUNE UP. BUT TO NO AVAIL THIS WASNT EVEN SCRATING THE SURFACE. SINCE THEN I HAVE DONE A COMPRESSION CHECK JUST TO VERIFY ALL CYLS ARE IN GOOD SHAPE AND THE NUMBERS ARE IN GOOD RANGE. WHEN THE ENGINE IS STARTED AND JUST IDELED OUT PUT VOLTAGE ON ALT WAS ANYWHERE FROM FIVE TP EIGHT VOLTS. WHEN THE IDLE SPEED WAS INCREASED TO AN UNDETERMINED SPEED THE ALT VOLT SUDDENLLY BUT ERRADICALLY JUMPS TO 48 VOLTS. I CHANGED THE ALT THINKING THAT THE REALLY HIGH VOLTAGE WAS PROBABLY SCREWING THE ECU UP AND CAUSING THE PROB. ANY INFO WOULD BE HELPFUL THANX

[S13Joe]

WELCOME TO THE FORUMS, JUST SO YOU KNOW YOU DON'T HAVE TO TYPE IN ALL CAPS. ITS VERY ANNOYING TO READ ESPECIALLY WHEN YOU ARE ASKING FOR HELP. WHAT ARE THE SYMPTOMS OF THE CAR? CHECK THE 75A ALTERNATOR FUSE, THATS THE ONLY THING I CAN THINK OF BECAUSE I CAN BARELY SORT THROUGH YOUR MESS OF A PARAGRAPH.

[edgartheace]

Check your injectors also. one bad one and your engine shakes more than a crackhead in rehab,

[Justin35ll]

I read about 2 lines, then got sick of the caps so use lower case next time

[Arashi]

WHY ARE WE YELLING?!

[AZ89two4Tsx]