I just had my injectors tested and cleaned. Five flowed at 15 and one at 20 pre-cleaning. Post cleaning, the five that flowed at 15 went up to 17 and the one at 20 stayed the same. My question is, is this going to cause a rich condition? Should I replace the one or does it really matter?

 

what company did you use?
these guys are top notch...
http://witchhunter.com/index.php4
check out their injector cleaning process... "After the foam settles, the results can be seen, these flowed to within 1%. "

 

No. Mixture is controlled by ECU by monitioring engine sensors, most importantly the O2 sensor. Then it adjusts to achieve a 14.7 :1 mixture.
It does this by changing the time the injector is opened so the flow of the injector does not make a difference as the computer will correct for the flow change.

 

since the O2 sensor is not capable of responding fast enough to measure individual cylinder gasses and all 6 injectors are fired for the same duration, theoretically the one cylinder with the higher flow injector could run slightly rich while the others could be very slightly lean.

a ~15% difference in flow rate is not exactly a small amount- that one injector will inject approximately 15% more fuel for any given pulse duration than the other injectors.

 

I had a guy in my town clean them. He only charged me $15.00 apiece. With the two opposing views on it running rich or not, it seems like I would be better off picking one up at the junkyard and having it cleaned for 20-25 bucks.

 

or you could take them all back to the guy who cleaned them and have him re-clean all of them until they are within 1-2% of each other...