Car is running rich

a stock stang has a FPR, as do cars with return line fuel systems.

the puter will adapt the A/F to accomodate changes you make to FP, so I would be lookin elsewhere for the cause (bad sensors, cracked charcoal cannister, etc).

good luck.

If the cats are removed or gutted, you would smell the unburned gas smell from the pipes.. you sure it's rich mixture? You see black smoke from the tailpipes, etc?

JJPA said:

the car is not stock. it has a 255 walbro fuel pump in it, along with explorer upper and GT40 lower intake mani. I was thinking of compensating the fuel pressure itself to lean it out more, and maybe advancing the timing a bit.

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Did you upgrade to a returnless style fuel system? If not, you should have a return style fuel system with a FPR.

like I said, the computer will adapt to whatever FP you set that is within reason. Adaptive control is a warm and fuzzy thing.

good luck.

pull codes it could be some ad sensors causing it to run rich.

Dump the codes and see what the computer says is wrong…

Here's the link to dump the computer codes with only a jumper wire or paper clip and the check engine light, or test light or voltmeter. I’ve used it for years, and it works great.

See http://www.troublecodes.net/Ford/
OR
See http://www.mustangworks.com/articles/electronics/eec-iv_codes.html

IF your car is an 86-88 stang, you'll have to use the test lamp or voltmeter method. There is no functional check engine light on the 86-88's except possibly the Cali Mass Air cars.

Codes have different answers if the engine is running from the answers that it has when the engine isn't running. It helps a lot to know if you had the engine running when you ran the test.

Trouble codes are either 2 digit or 3 digit, there are no cars that use both 2 digit codes and 3 digit codes.

For those who are intimidated by all the wires & connections, see http://www.actron.com/product_detail.php?pid=16153 for what a typical hand scanner looks like. Normal retail price is about $30 or so at AutoZone or Walmart.

Or for a nicer scanner see http://www.midwayautosupply.com/detailedproductdescription.asp?3829 – It has a 3 digit LCD display so that you don’t have to count flashes or beeps.. Cost is $33.

I just posted on your other thread about what I would do with regard to the FP gauge.

Good luck bud.