Page updated on 11-17-2017

96 tahoe misfire, have scanner info


Delusional
02-09-2009, 07:23 PM
Hello,
I have a 96 tahoe with a 5.7 vortec and im chasing a misfire problem.
i checked for an intake gasket leak but that wasnt it so i hooked up a Snap-On Ethos and this is the misfire info, if anyone can point me in the right direction it would be a huge help!
misfire cycles 5
cylinder mis index 489
mis per cycle 255
# of misfires 22
misfire passes 0
# of normals 0
misfire fails 189
1,2,3,4,6 were all 0 but cyl 4 had 4 in history and cyl 6 had 393 in history. cylinder 5 has 4 and 26853 in history. this was done with the vehicle at 693 rpm with 13.7 volts on the ignition and an engine load of 14%. Also the 02 b1-s1 stat and 02 b2-s1 stat are rapidly fluctuating, i did a compression test yesterday on cylinders 3 and 5 and it was 170 psi.

MT-2500
02-11-2009, 10:09 AM
Hello,
I have a 96 tahoe with a 5.7 vortec and im chasing a misfire problem.
i checked for an intake gasket leak but that wasnt it so i hooked up a Snap-On Ethos and this is the misfire info, if anyone can point me in the right direction it would be a huge help!
misfire cycles 5
cylinder mis index 489
mis per cycle 255
# of misfires 22
misfire passes 0
# of normals 0
misfire fails 189
1,2,3,4,6 were all 0 but cyl 4 had 4 in history and cyl 6 had 393 in history. cylinder 5 has 4 and 26853 in history. this was done with the vehicle at 693 rpm with 13.7 volts on the ignition and an engine load of 14%. Also the 02 b1-s1 stat and 02 b2-s1 stat are rapidly fluctuating, i did a compression test yesterday on cylinders 3 and 5 and it was 170 psi.

Any codes?
Clear missfire history and see what comes back.

How is the plugs and wires and cap and rotor?
AC Delco plugs?
What is the camshaft retard reading?
What is the fuel pressure doing?
Post back fuel pressure reading on the road hot after 20-30 minutes running?
Any fast leak down?

CENA
02-17-2009, 04:26 AM
Hello, I also have 1996 and I will get that same misfire when I use gas with 10% ethanol in it. Only 2 gas stations left in town without ethanol! My check engine light will come on, but will go off after awhile, depending on how soon I can get ethanol free gas in it.

CENA
04-14-2009, 08:13 AM
Also, if you have gas with ethanol in it. Put a bottle of Seafoam in the gas tank. My engine light will go off sooner after doing this.

Add your comment to this topic!