hey guys, i have a problem with my new v6. as some of you know, i just recently rebuilt my 2.8. my problem is that the motor runs rich. i have no idea why, all my vacuum hoses are hooked up, fuel regulator is hooked up. tps is hooked up, O2 sensor is hooked up. and i have no codes to boot. any ideas? oh yeah, and i am fowling pluggs every now and then. i have pretty new accel 8mm wires on it too. if anything, this motor should be runing lean cause it's been bored .040 over and the decks of the block and the heads have been zeroed, but there are times (not all of the time) when i get on it and i see a puff of black smoke in the mirror. any and all suggestions accepted.

 

my stock 3.1 does that...when i get up to 5 grand it shoots out black smoke. i know i'm not helping at all with this statement, but i'm interested in this post

 

TPS problem ? need adjusted/cleaned/replaced ?

MAP sensor problem
?

 

TPS problem ? need adjusted/cleaned/replaced ?

MAP sensor problem
?

 

Have you broken in the motor yet? My 2.8 use to run rich and give no codes until the motor had some miles on her. Hope I helped

 

Back to basics.
Weak ignition system
Recheck ALL vacuum hoses. FLIP over the hoses for viewing underside.
Since I did my swap back in Jan 2000, I still check & chase a vacuum hose leak every once in a while.
Did you rebuild the distributor? AND install ALL new internals? Coil new?
Again basics & common sesne will help ya with this question.

 

distro is brand new, got an accel supercoil, and the motor has well over 5k on it. i will check tps and map although i think the map is fairly new too.

 

how do u know it runs rch???

are u using a A/F gauge or reading the ALDL stuff???

well i cant start my car on one start in the
morining ....i could before i put the 19lb injectors
in .....ALDL does not read correct immed after
u start the car and O2 sensor needs to warm
up i guess.....

 

Last points...
How about the O2 sensor
Proper heat range plugs?
After that, I'm outta ideas.....
Yes, how do you KNOW it's running rich?

 

when i accelerate away from my house, my dad watches me leave and he says there is a little puff of black smoke coming out of the exhaust, like unburnt gasoline. and i can smell it from time to time.

 

move up a heat range in the plugs. break out dvm & check out resistance/continuity while twisting wires.