Thread: Car is running rich... I think

So i just did a custom u-bend delete, and resonator delete. also i did a custom tune using a zzp platform. now i noticed that my exhaust smells like im running rich. also when i rev my engine while in park, until the limiter kicks in, as soon as i let off the gas a small plume of smoke comes out. it doesnt smoke while driving or while the engine is running at idle. im pretty sure im running rich. can someone give me some advice. as far as what can i do to fix this minor issue

yea i kno numbers dont lie, i just cant get a hold of my buddy with the hp tuner til saturday. if its a tuning problem i can find out then, but i was hopin somebody could give me some ideas of what some possible mechanical problems could be....

Originally Posted by Bio248

it doesnt go to redline, it only revs to 4k when youre not moving.

yea, the rpms are limited to 4000 while in park. and it lets out a small puff of black smoke. but like i said its only when i rev the engine. it doesnt smoke all the time.

Originally Posted by taman86

with the limiter set at 4k is a different story, but still, rev the **** out of it with no load (parked) and scan it while doing so and watch your knock go ape **** speaking on general terms.

You have no clue what you are talking about.

I would say that this is fairly normal stuff, and assuming you did not disturb the upstream O2 sensor, you should not be having any issues.