2005 Chevy Z71 5.3 Something Not right
#1
2005 Chevy Z71 5.3 Something Not right
Guys i have a 2005 Chevy truck with a 5.3 i am looking at for a friend he was on his way to work the other day and it just started losing power and missing we hooked it to my computer and it shows a Random miss fire but just on the passanger side of the motor so we put new plugs and wires on it and that did not fix it.
So i hooked it to my Hp Tuners and this is what i found no reading from the front O2 are the Inj at all take a look at the Data Log i made with my Hp Tuner and let me know what you guys thinl it could be.
Any help would be GREAT this guy has 4 kids and cant spend a lot of money on just changing out parts to try and fix it i think the ECM is bad but a new on is $300 and we need to know for sure so not to waste $300 and not fix it.
So i hooked it to my Hp Tuners and this is what i found no reading from the front O2 are the Inj at all take a look at the Data Log i made with my Hp Tuner and let me know what you guys thinl it could be.
Any help would be GREAT this guy has 4 kids and cant spend a lot of money on just changing out parts to try and fix it i think the ECM is bad but a new on is $300 and we need to know for sure so not to waste $300 and not fix it.
#9
TECH Apprentice
iTrader: (4)
Hey man
Unlikely it's the PCM
By unlikely I mean it's possible But it not gonna be it
I can't see your scan tool data.
What does it have for codes?
Is it missing on all bank 2 cylinders or just 1 cylinder on bank 2.
Does it have dual cats or just one.
I need more info from you but
Could have a bad bank 2 cat if it has dual cats and missing on 2-4-6-8
Broken valve spring if only missing on 1 cylinder
Possible to have faulty 02 but usually does not cause a mis.
If it was a 02 you usually can unplug the suspect sensor and it will put it to a base value and usually run better.
I can help you fix this with a little more info
Unlikely it's the PCM
By unlikely I mean it's possible But it not gonna be it
I can't see your scan tool data.
What does it have for codes?
Is it missing on all bank 2 cylinders or just 1 cylinder on bank 2.
Does it have dual cats or just one.
I need more info from you but
Could have a bad bank 2 cat if it has dual cats and missing on 2-4-6-8
Broken valve spring if only missing on 1 cylinder
Possible to have faulty 02 but usually does not cause a mis.
If it was a 02 you usually can unplug the suspect sensor and it will put it to a base value and usually run better.
I can help you fix this with a little more info
#10
Hey man
Unlikely it's the PCM
By unlikely I mean it's possible But it not gonna be it
I can't see your scan tool data.
What does it have for codes?
Is it missing on all bank 2 cylinders or just 1 cylinder on bank 2.
Does it have dual cats or just one.
I need more info from you but
Could have a bad bank 2 cat if it has dual cats and missing on 2-4-6-8
Broken valve spring if only missing on 1 cylinder
Possible to have faulty 02 but usually does not cause a mis.
If it was a 02 you usually can unplug the suspect sensor and it will put it to a base value and usually run better.
I can help you fix this with a little more info
Unlikely it's the PCM
By unlikely I mean it's possible But it not gonna be it
I can't see your scan tool data.
What does it have for codes?
Is it missing on all bank 2 cylinders or just 1 cylinder on bank 2.
Does it have dual cats or just one.
I need more info from you but
Could have a bad bank 2 cat if it has dual cats and missing on 2-4-6-8
Broken valve spring if only missing on 1 cylinder
Possible to have faulty 02 but usually does not cause a mis.
If it was a 02 you usually can unplug the suspect sensor and it will put it to a base value and usually run better.
I can help you fix this with a little more info
We pulled the Wires off and checked the spark and it firing on 2-4-6-8 i think it just not firing the injectors on 2-4-6-8 you can unplug the injectors all on bank 2 and it keeps running just the same.The motor is only running on 1-3-5-7 if you unplug any of the 1-3-5-7 injectors it will give a code and die.
Does it have dual cats Yes it has Dual Cats it a Stock 2005 Chevy truck with a 5.3 all Stock.
Last edited by thenova70ss; 08-16-2012 at 10:57 PM.