YUKONJOSEPPI
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- Joined
- Dec 1, 2019
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HELLO ALL
I HAVE A INTERESTING PROBLEM ON MY 2006 YUKON DENALI XL (6.0L)
THE TRUCK HAS A INTERMITTENT START PROBLEM
THERE IS NO RHYME OR REASON WHEN IT START OR DOES NOT START.
WHEN IT DOES NOT START ON THE FIRST TIME IT ALWAYS START ON THE SECOND TIME.
LET ME TELL TELL YOU WHAT I HAVE DONE TO TRY AND FIX IT
PARTS REPLACE
(FUEL STUFF)
-FUEL PUMP TWICE. ONE MOGG AND ONE FROM THE DEALER. THE DEALER TOLD ME THAT THE NEW FUEL PUMP I PUT IN WAS BAD.
- NYLON FUEL LINE
-STEEL FUEL LINE CONNECTS TO THE RAIL. ( POINTS OF INTEREST THERE IS NO FUEL FILTER, OR FUEL REGULATOR ON THE RAIL.)
-INJECTORS
(ENGINE STUFF)
-CRANK POSITION SENSOR (THERE IS ONLY ONE CONFIRMED WITH THE DEALER)
-CAM POSITION SENSOR (DID NOT DO A RELEARN)
-OIL PRESSURE SENSOR
-MASS AIR SENSOR
-MAP SENSOR
-VAPOR CANISTER PURGE SENSOR (TOP OF INTAKE)
-ACELERATOR POSITION SENSOR
-IGNITON SWITCH (DID THE RELEARN FOR PASSLOCK)
-ALTERNATOR
-STARTER
-PCM FLASHED TO THE VIN
-BODY CONTROL MODULE FLASHED TO THE VIN (DID RELEARN FOR PASSLOCK
-FUEL TANK PRESSURE SENSOR
-FUEL RELAY SWAPP
-FUEL FUEL SWAPP
WHAT I HAVE DIAGNOSED
THE FUEL RELAY HAS 4 PINS
86 30
87 85
86 GET 1 VOLT LESS THE BATTERY VOLTAGE WHEN TURNING KEY
30 GET 12 VOLTS ALL THE TIME
87 HAVE TO RECHECK BUT I BELIEVE NORMAL 12 VOLTS
85 I BELIEVE WAS GROUND
I ADDED NEW GROUNDS TO THE FRAME, CHASSIS AND ENGINE. I CLEANED ALL THE GROUNDS ON THE FRAME AND ENGINEGROUNDS ACCEPT FOR ONE. THE MAIN GROUND OFF THE BATTERY THAT GOES TO THE ENGINE BLOCK.
WHEN I GO TO START THE TRUCK AND IT DOES NOT START I HAVE THESE TESTER HOOKED UP
- FUEL GAUGE (50-55 PSI)
-SPARK TESTER (GETTING SPARK)
-NOID TESTER (INJECTORS FIRING I CHECKED 2 DIFFERENT ONES
IF I CYCLE THE KEY 3 TIMES AND TRY IT STILL WILL NOT START
There are no engine codes. Idle’s a little rough and the light dim sometimes. Runs great lots of power no issues driving
I WILL TELL YOU THE PRESSURE DOES NOT HOLD AT 50-55 IF I CYCLE THE KEY AND LET IT SIT. ITS LIKE THE CHECK VALVE IS BAD. BUT HOW CAN THAT BE TWO BRAND NEW FUEL PUMPS(ENTIRE HOUSING)
WHAT CAN I CHECK. SHOULD I BUY A 300-400 COMPUTER AND USE REAL TIME MONITORING TO FIGURE SOMETHING OUT.
THANKS FOR EVERYONES HELP.
JOE
I HAVE A INTERESTING PROBLEM ON MY 2006 YUKON DENALI XL (6.0L)
THE TRUCK HAS A INTERMITTENT START PROBLEM
THERE IS NO RHYME OR REASON WHEN IT START OR DOES NOT START.
WHEN IT DOES NOT START ON THE FIRST TIME IT ALWAYS START ON THE SECOND TIME.
LET ME TELL TELL YOU WHAT I HAVE DONE TO TRY AND FIX IT
PARTS REPLACE
(FUEL STUFF)
-FUEL PUMP TWICE. ONE MOGG AND ONE FROM THE DEALER. THE DEALER TOLD ME THAT THE NEW FUEL PUMP I PUT IN WAS BAD.
- NYLON FUEL LINE
-STEEL FUEL LINE CONNECTS TO THE RAIL. ( POINTS OF INTEREST THERE IS NO FUEL FILTER, OR FUEL REGULATOR ON THE RAIL.)
-INJECTORS
(ENGINE STUFF)
-CRANK POSITION SENSOR (THERE IS ONLY ONE CONFIRMED WITH THE DEALER)
-CAM POSITION SENSOR (DID NOT DO A RELEARN)
-OIL PRESSURE SENSOR
-MASS AIR SENSOR
-MAP SENSOR
-VAPOR CANISTER PURGE SENSOR (TOP OF INTAKE)
-ACELERATOR POSITION SENSOR
-IGNITON SWITCH (DID THE RELEARN FOR PASSLOCK)
-ALTERNATOR
-STARTER
-PCM FLASHED TO THE VIN
-BODY CONTROL MODULE FLASHED TO THE VIN (DID RELEARN FOR PASSLOCK
-FUEL TANK PRESSURE SENSOR
-FUEL RELAY SWAPP
-FUEL FUEL SWAPP
WHAT I HAVE DIAGNOSED
THE FUEL RELAY HAS 4 PINS
86 30
87 85
86 GET 1 VOLT LESS THE BATTERY VOLTAGE WHEN TURNING KEY
30 GET 12 VOLTS ALL THE TIME
87 HAVE TO RECHECK BUT I BELIEVE NORMAL 12 VOLTS
85 I BELIEVE WAS GROUND
I ADDED NEW GROUNDS TO THE FRAME, CHASSIS AND ENGINE. I CLEANED ALL THE GROUNDS ON THE FRAME AND ENGINEGROUNDS ACCEPT FOR ONE. THE MAIN GROUND OFF THE BATTERY THAT GOES TO THE ENGINE BLOCK.
WHEN I GO TO START THE TRUCK AND IT DOES NOT START I HAVE THESE TESTER HOOKED UP
- FUEL GAUGE (50-55 PSI)
-SPARK TESTER (GETTING SPARK)
-NOID TESTER (INJECTORS FIRING I CHECKED 2 DIFFERENT ONES
IF I CYCLE THE KEY 3 TIMES AND TRY IT STILL WILL NOT START
There are no engine codes. Idle’s a little rough and the light dim sometimes. Runs great lots of power no issues driving
I WILL TELL YOU THE PRESSURE DOES NOT HOLD AT 50-55 IF I CYCLE THE KEY AND LET IT SIT. ITS LIKE THE CHECK VALVE IS BAD. BUT HOW CAN THAT BE TWO BRAND NEW FUEL PUMPS(ENTIRE HOUSING)
WHAT CAN I CHECK. SHOULD I BUY A 300-400 COMPUTER AND USE REAL TIME MONITORING TO FIGURE SOMETHING OUT.
THANKS FOR EVERYONES HELP.
JOE