can anybody help me uggg
Thread Starter
CF Beginner
Joined: May 2010
Posts: 9
Likes: 0
can anybody help me uggg
I have a 2003 chevy express 3500 pasanger van it has a 6.0 ltr it runs on both pump gas and cng the cng has been disconnected the van ran perfect with out it:-) But to get on to my problem I was in nashville van ran great up ther got gas at shell about ten min later the van started missing not to bad then the check engine light started flashing the miss has been really bad ever sence
checked the code all i get is p0300 random missfire so her are the things that i can think of that ive done to diagnose or to fix it. So far ive replaced the spark plugs, spark plug wires, fuel filter, added gas dryer and couple diffrent fuel treatments, removed the fuel rail cleaned and check everthing, checked the injectors with noide light all is good, also checked the compression the highest was 170 lowest was 160, checked the coils with testor all seam to look the same color also checked the ecm looks good nothing that i can see also checked the cats for blockage nothing ther eather i have a fealing its something simple so im praying one of you guys or girls have had a freind or know of a tsb on this problem sombody hopefully can point me in the right direction thank you so much
i check my email regular and will get back to you asap i will respond to all post please help me im going to go nuts
cherrs 
checked the code all i get is p0300 random missfire so her are the things that i can think of that ive done to diagnose or to fix it. So far ive replaced the spark plugs, spark plug wires, fuel filter, added gas dryer and couple diffrent fuel treatments, removed the fuel rail cleaned and check everthing, checked the injectors with noide light all is good, also checked the compression the highest was 170 lowest was 160, checked the coils with testor all seam to look the same color also checked the ecm looks good nothing that i can see also checked the cats for blockage nothing ther eather i have a fealing its something simple so im praying one of you guys or girls have had a freind or know of a tsb on this problem sombody hopefully can point me in the right direction thank you so much i check my email regular and will get back to you asap i will respond to all post please help me im going to go nuts cherrs
CF Junior Member
Joined: May 2010
Posts: 75
Likes: 2
When you pulled the plugs were you able to tell which cylinder was misfiring?
Here is your TSB list.
Recall - Seat Belt Buckle Inoperative
05113C
04/23/2008
Campaign - Engine Comp. Fuse Block Cover Warranty Ext.
07095
09/28/2007
Campaign - Steering Idler Arm Bracket Warranty Extension
07103
05/25/2007
Recall 05V558000: Front/Rear Seat Belt Buckle Defect
NHTSA05V558000
12/12/2005
Recall - Child Restraint Anchorage Non-Compliance
04038
09/01/2004
Recall - A/T Shift Cable Separation
04061A
08/27/2004
Recall - Brake Hydroboost Relief Valve Seal Defect
04004
06/01/2004
Recall 04V225000: Child Seat Anchorage Non-Compliance
NHTSA04V225000
05/10/2004
Recall - Wheel Bearing Retainer Nut Missing
02053A
03/23/2004
Recall 04V045000: Possible Hydro-Boost Defect
NHTSA04V045000
02/01/2004
Campaign - Driveshaft Fracturing
03040
11/11/2003
Recall - Child Restraint Anchorage Information
03039
08/01/2003
Recall - License Plate Lamp Socket Fire Hazard
03031
07/01/2003
Recall 03V250000: Child Restraint Non-Compliance
NHTSA03V250000
07/01/2003
Recall 03V217000: Rear License Plate Lamp Socket Defect
NHTSA03V217000
06/01/2003
Recall 03V094000: Running Board Wiring Defect
NHTSA03V094000
03/01/2003
Recall - Pitman Arm/Steering Linkage Nut Torque
02063
12/01/2002
Recall - Emissions, Spark Plug Replacement
02059
12/01/2002
Recall 02V305000: Wheel Bearing Retaining Nut Missing
NHTSA02V305000
11/01/2002
Recall 03V050000: Seat Belt Buckle Replacement
NHTSA03V050000
02/01/2002
Have you tried pulling one plug off at a time while its running and finding out which cylinder is misfiring? Im guessing its a coil pack.
Here is your TSB list.
Recall - Seat Belt Buckle Inoperative
05113C
04/23/2008
Campaign - Engine Comp. Fuse Block Cover Warranty Ext.
07095
09/28/2007
Campaign - Steering Idler Arm Bracket Warranty Extension
07103
05/25/2007
Recall 05V558000: Front/Rear Seat Belt Buckle Defect
NHTSA05V558000
12/12/2005
Recall - Child Restraint Anchorage Non-Compliance
04038
09/01/2004
Recall - A/T Shift Cable Separation
04061A
08/27/2004
Recall - Brake Hydroboost Relief Valve Seal Defect
04004
06/01/2004
Recall 04V225000: Child Seat Anchorage Non-Compliance
NHTSA04V225000
05/10/2004
Recall - Wheel Bearing Retainer Nut Missing
02053A
03/23/2004
Recall 04V045000: Possible Hydro-Boost Defect
NHTSA04V045000
02/01/2004
Campaign - Driveshaft Fracturing
03040
11/11/2003
Recall - Child Restraint Anchorage Information
03039
08/01/2003
Recall - License Plate Lamp Socket Fire Hazard
03031
07/01/2003
Recall 03V250000: Child Restraint Non-Compliance
NHTSA03V250000
07/01/2003
Recall 03V217000: Rear License Plate Lamp Socket Defect
NHTSA03V217000
06/01/2003
Recall 03V094000: Running Board Wiring Defect
NHTSA03V094000
03/01/2003
Recall - Pitman Arm/Steering Linkage Nut Torque
02063
12/01/2002
Recall - Emissions, Spark Plug Replacement
02059
12/01/2002
Recall 02V305000: Wheel Bearing Retaining Nut Missing
NHTSA02V305000
11/01/2002
Recall 03V050000: Seat Belt Buckle Replacement
NHTSA03V050000
02/01/2002
Have you tried pulling one plug off at a time while its running and finding out which cylinder is misfiring? Im guessing its a coil pack.
Thread Starter
CF Beginner
Joined: May 2010
Posts: 9
Likes: 0
When you pulled the plugs were you able to tell which cylinder was misfiring?
Here is your TSB list.
Recall - Seat Belt Buckle Inoperative
05113C
04/23/2008
Campaign - Engine Comp. Fuse Block Cover Warranty Ext.
07095
09/28/2007
Campaign - Steering Idler Arm Bracket Warranty Extension
07103
05/25/2007
Recall 05V558000: Front/Rear Seat Belt Buckle Defect
NHTSA05V558000
12/12/2005
Recall - Child Restraint Anchorage Non-Compliance
04038
09/01/2004
Recall - A/T Shift Cable Separation
04061A
08/27/2004
Recall - Brake Hydroboost Relief Valve Seal Defect
04004
06/01/2004
Recall 04V225000: Child Seat Anchorage Non-Compliance
NHTSA04V225000
05/10/2004
Recall - Wheel Bearing Retainer Nut Missing
02053A
03/23/2004
Recall 04V045000: Possible Hydro-Boost Defect
NHTSA04V045000
02/01/2004
Campaign - Driveshaft Fracturing
03040
11/11/2003
Recall - Child Restraint Anchorage Information
03039
08/01/2003
Recall - License Plate Lamp Socket Fire Hazard
03031
07/01/2003
Recall 03V250000: Child Restraint Non-Compliance
NHTSA03V250000
07/01/2003
Recall 03V217000: Rear License Plate Lamp Socket Defect
NHTSA03V217000
06/01/2003
Recall 03V094000: Running Board Wiring Defect
NHTSA03V094000
03/01/2003
Recall - Pitman Arm/Steering Linkage Nut Torque
02063
12/01/2002
Recall - Emissions, Spark Plug Replacement
02059
12/01/2002
Recall 02V305000: Wheel Bearing Retaining Nut Missing
NHTSA02V305000
11/01/2002
Recall 03V050000: Seat Belt Buckle Replacement
NHTSA03V050000
02/01/2002
Have you tried pulling one plug off at a time while its running and finding out which cylinder is misfiring? Im guessing its a coil pack.
Here is your TSB list.
Recall - Seat Belt Buckle Inoperative
05113C
04/23/2008
Campaign - Engine Comp. Fuse Block Cover Warranty Ext.
07095
09/28/2007
Campaign - Steering Idler Arm Bracket Warranty Extension
07103
05/25/2007
Recall 05V558000: Front/Rear Seat Belt Buckle Defect
NHTSA05V558000
12/12/2005
Recall - Child Restraint Anchorage Non-Compliance
04038
09/01/2004
Recall - A/T Shift Cable Separation
04061A
08/27/2004
Recall - Brake Hydroboost Relief Valve Seal Defect
04004
06/01/2004
Recall 04V225000: Child Seat Anchorage Non-Compliance
NHTSA04V225000
05/10/2004
Recall - Wheel Bearing Retainer Nut Missing
02053A
03/23/2004
Recall 04V045000: Possible Hydro-Boost Defect
NHTSA04V045000
02/01/2004
Campaign - Driveshaft Fracturing
03040
11/11/2003
Recall - Child Restraint Anchorage Information
03039
08/01/2003
Recall - License Plate Lamp Socket Fire Hazard
03031
07/01/2003
Recall 03V250000: Child Restraint Non-Compliance
NHTSA03V250000
07/01/2003
Recall 03V217000: Rear License Plate Lamp Socket Defect
NHTSA03V217000
06/01/2003
Recall 03V094000: Running Board Wiring Defect
NHTSA03V094000
03/01/2003
Recall - Pitman Arm/Steering Linkage Nut Torque
02063
12/01/2002
Recall - Emissions, Spark Plug Replacement
02059
12/01/2002
Recall 02V305000: Wheel Bearing Retaining Nut Missing
NHTSA02V305000
11/01/2002
Recall 03V050000: Seat Belt Buckle Replacement
NHTSA03V050000
02/01/2002
Have you tried pulling one plug off at a time while its running and finding out which cylinder is misfiring? Im guessing its a coil pack.
Thread Starter
CF Beginner
Joined: May 2010
Posts: 9
Likes: 0
UPDATE!!! was driving it arond town parked it went to auto zone started it back up andhurd a awfull clack clack clack limped it all the way back home pulled the dog house off started it back up and noticed it was comming from the passanger side crap!!! so pulled the coils and the valv cover off inspected it and noticed i had a broken valve spring "you got to be kidding!!!!" so i pulled the rocker arm and spring from both sides the spin freely and work up and down fully but i did notice i think cant really tell but it looks like the vale might of taped the piston i really hope this rules out a bent valve as for the push rods idk how much out of round they come stock? mine might just have the slightest wobble to them??? any thing you think could of cause this and dou you guys think this could be my problem all along and would this cause a miss on 5 and 7 to being there on the other side of the motor? any more things i need to check to make shure nothing damaged?
limped it all the way back home pulled the dog house off started it back up and noticed it was comming from the passanger side crap!!! so pulled the coils and the valv cover off inspected it and noticed i had a broken valve spring "you got to be kidding!!!!" so i pulled the rocker arm and spring from both sides the spin freely and work up and down fully but i did notice i think cant really tell but it looks like the vale might of taped the piston i really hope this rules out a bent valve as for the push rods idk how much out of round they come stock? mine might just have the slightest wobble to them??? any thing you think could of cause this and dou you guys think this could be my problem all along and would this cause a miss on 5 and 7 to being there on the other side of the motor? any more things i need to check to make shure nothing damaged?
CF Beginner
Joined: Jun 2010
Posts: 3
Likes: 0
I will keep up with you as I have a 01 5.7 vortec that just started a similar issue-missfire on the number 4 cylinder. My van is now consuming oil and the plug at number 4 is fouing with oil. I havent removed the valve cover but I will do this after reading yours. Good luck with the repair and keep us posted.
markj
markj
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