Arachnosold1er

So my 99 camaro with full bolt ons was running great until I grenaded the driveshaft, destroying my freshly built trans and relatively new exhaust. The car is back on the road, but is running pig rich all the time. I just replaced the exhaust and re-did the header to head gaskets to eliminate exhaust leaks possibly causing the PCM to think its lean, and adding more fuel. When I log with HPTuners and my LC1 wideband, my AFR is within +/- 5 across the board and around 13.1 to 13.3 AFR. But at an idle it'll choke you out with exhaust and at WOT looks like a diesel rolling coal. What am I missing? Running SD tune, no MAF, no cats. TSP 233/239 cam with PRC stage 2.5 5.3L heads. Still hauls butt and runs smooth, just pig rich.

1slowbusa

iTrader: (8)

Did you replace the plug and what gap?

Arachnosold1er

Not recently. I can't remember the plug specifics, they are stock heat range and gap. NGK IX plugs. About a year old.

1slowbusa

iTrader: (8)

Oh ok, heard this happening if the gap is to small on the plugs. Has it been tuned for the internal mods or just for the bolt on. Do a log, post it with your config file and aslo post your tune.

Arachnosold1er

I'll do a log and post it along with the tune tonite. Still at work right now. It's not off from what I'm commanding is what confuses me. Maybe the wideband is not reading right? I did a free air calibration of the wideband when I put the car back On the road a few weeks ago.

Cosmik de Bris

The wideband isn't controlling the fuel/air so it doesn't matter if it is reading incorrectly, you've still got black smoke indicating it's too rich.

Arachnosold1er

But the wideband was used to tune the VE, and therefore affects fueling. I'm aware that it's rich, the black smoke and smell makes it super obvious. But the WBO2 is saying I'm where I should be in relation to what I'm commanding which is 13.1 AFR. 13.1 should not be rich enough to cause the amount of smoke I'm getting. I ran the same AFR in the car before and it was spot on and ran like a scalded ape with a tad bit of smoke at Wot only.