Very weird ignition problem, running rich? I'm stumped

[Blaze]

Very weird ignition problem, running rich? I\'m stumped

I just installed my headers on my 92 Yukon today. I ran a set of Pacesetter shorties on it. My exhaust system was rusted off, so I had to yank that, so I'm running open headers till I can get to the muffler shop and have them bend up my duals. I got them all installed and then drove around the block (less than a mile) and when I got home one of the tubes had already blistered, but none of the others. When I revved up the truck, it would backfire from that bank and not the other. I know the wires are right and the plugs are good, I checked them. Anyone have any ideas?

 

[pauly383]

Re: Very weird ignition problem, running rich? I\'m stumped

How short are they? You should have a little pipe on them I'm sure. I ran open headers on my 76 Chevelle and shot flames out of them sometimes. I couldn't explain the theory behind it, but you need some more pipe on there. /forums/images/graemlins/k5.gif

 

[bryguy00b]

Re: Very weird ignition problem, running rich? I\'m stumped

i would think you would need more back presure or something..

 

[bigburban383]

Re: Very weird ignition problem, running rich? I\'m stumped

You've got the oxygen sensor hooked up right?

 

[Blaze]

Re: Very weird ignition problem, running rich? I\'m stumped

Hmmm, I seem to have forgotten to reinstall the O2 sensor. /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif

I'm gonna run an O2 sim so I won't have to worry about that little bastard anymore. /forums/images/graemlins/thumb.gif

 

[Thunder]

Re: Very weird ignition problem, running rich? I\'m stumped

Why would you want to run a 02 simulator /forums/images/graemlins/confused.gif
The computer needs input from the 02 to set fuel to air ratio. Without it you will always be running rich even with a 02 sim it wont give the right readings. Your rig will run better with a 02 sensor. To run without one you would need to get a chip burned to ignore the 02 readings.If the ECM detects no readings from the 02 it will go into bypass mode.
When in bypass you loose power and suck gas because it defaults to a over rich mode.
Most people just use 02 Sims in newer rigs with 02s before and after the cat. You put in a 02 sim to get rid of the rear 02 sensor so you can get rid of the Cat. That way the ECM wont light the CEL. But you still keep the front one so the ECM can control A/F ratio.

 

[4xcrazy]

Re: Very weird ignition problem, running rich? I\'m stumped

exactamundo /forums/images/graemlins/waytogo.gif