fastcars95

iTrader: (9)

I'm having a problem with my new set-up. It just started sputtering and going really rich (9.0 AFR). Its seems to be fine for about 15minutes then it starts braking up really bad. First it thought it was fouling the plugs but I pulled a couple and they looked good. Then I thought its was a second pump dumping too much fuel so I put it on a pressure switch. Nothing still. Now its going 10.0afr at partial throttle while cruising. I step on it and it goes away and pulls hard. Half the time it pulls great then its just falls apart and wont pull at all. Could I have clogged my cat?.
Any ideas.

98Z28CobraKiller

iTrader: (17)

is it in closed loop? Sounds like a bad o2 sensor. When they go bad, the car will usually run pig rich unless it has been tuned to run in open loop.

fastcars95

iTrader: (9)

I'm not sure. I don't have any tuning software to check. But I should take a better look at the O2 wire harness to see if I melted them. I'm also going to pull the cat tomorrow just incase I get lucky with it being plugged.

fastcars95

iTrader: (9)

It was the O2 sensor wire melted to the header. Fixed