wheelliftnpony

Over the past two years or so I have noticed the car has been running richer and richer. First was gas mileage then a little black smoke so I checked the oil and sure enough it smells like fuel. What can cause this? All the plugs look great and the car runs fine, I'm just worried about washing the rings or wiping out a bearing :s is there anything I can do through the pcm (Delete o2 sensors, etc.) That will help? Thanks, Chris

Injuneer

Things that cause a "false lean" condition, causing the PCM to add fuel the engine doesn't need:

-misfires
-exhaust leaks before the O2 sensors
-defective O2 sensors/wiring
-high overlap cam
-O2 sensors in open header collectors

Things that dump fuel:

-leaking fuel pressure regulator
-excessive fuel pressure
-leaking injector(s)
-faulty tune

If the plugs don't look bad - e.g. no carbon deposits - its probably not running rich. Are they ALL clean? A leaking FPR for example, dumps fuel in the rear cylinders.

wheelliftnpony

Funny you would mention a false lean condition. Took it for a drive just a few minutes ago and the ses light came on. I had my tuner from Trifecta with me. So I scanned it right away. Got code 44. Left o2 sensor lean. I'm thinking now it's a faulty sensor, maybe pcm trying to fix a problem that isn't there..

Guest47904

You would be wise to check the plugs on both banks to confirm what the code reader says. Since you need to replace the dark ones anyway.

But since you've been driving it this way for 2 years, it needs a lot more than just plugs on the left bank and a single O2.

wheelliftnpony

Well the plugs in it aren't a month old yet. Kinda thought plugs should be changed with the cam and headwork. O2s I might replace with widebands anyway

Injuneer

Wide-bands? Then you are going to use emulation mode for the wide-bands to send a 0-1V signal to the PCM? You can't just plug a wide-band sensor directly into the stock PCM.... they have a 0-5V signal.

wheelliftnpony

Ok then it is a little more involved than I thought What do you think about an o2 delete as part of the tune?

RamAir95TA

If you're talking about running an open loop tune, that's fine (IMO) for a stripper car, but not so much on a street car. When properly setup using O2s will always yield better drivability and mileage.

Honestly though you should get it on a dyno and have it tuned.

Guest47904

IMHO, you are trying to "run" and you haven't even mastered "walking" yet.

wheelliftnpony

Ok thanks