I have had an ongoing issue with running extremely rich. I have tried fixing or modifying all the fuel components and it still runs extremely rich. I am thinking about purchasing the AEM adjustable fuel pressure regulator. Now, I know you can turn the psi up to increase the fuel, but can they also be turned down a few psi to decrease the fuel pressure? I would like some feedback for this because I would hate to buy one for 150-200 and not be able to turn the fuel down. Also, I emailed AEM a few times to ask this question but I received no response. Please help and thanks in advance.

 

How much? Screw that. I got a B&M command flo for a fraction of that. Seems like I can drop pressure a few PSI under stock.

 

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Yes, although I'd also combine that with some sort of fuel computer, since I'm sure the actual A/F ratio varies across the rev range. I'm just not a big advocate of simply increasing or decreasing fuel pressure to remedy a "lean" or "rich" condition. To me, that's like performing surgery with a sword.

 

Some aftermarket FPR doesn't even let you down any lower than 40psi. But you can work around that by drilling a small hole on the entrance side to bypass some of the fuel. It's not a good idea to go down too low though.

 

i think that the aem fpr is adjustable from 0-100 psi. i heard that somewhere, but i dunno for sure. i bought mine used and it didnt come with directions or anything

 

Yes, fixing a fuel issue by turning the psi down with an afpr is not the best way to go about it, but I have tried everything else and nothing has even come close to working. I have rewired o2 sensor, replaced and checked my injectors, etc, etc... Nothing has worked! Still runs just as rich as the day I had the swap done. Could be a bad o2, but doesn't throw code for actual o2, just o2 circuitry, also, I think that it runs way to rich for something as secondary as an o2 to cause the problem.
Any help?