would this make me run lean???

[Mazda_Powered]

hey guys, after installing my port and polished intake manifold/TB i've noticed that aorund 6k or so its not as responsive, and my spark plugs are showing signs of running lean or to much timing (they're have a grey coating to the tip now, they never really use to). also, to add more air, i have a 3"CAI with a generic highflow filter, thats basically all i have done for the intake system.

and if you do think im leaning out, and not getting enough gas, should i invest in an adjustable fuel pressure regulator? would this fix my problem?

here are my mods to further help.

P&P mani/tb
3"CAI
pacesetter 4-2-1 header
2.5 magnaflow exhaust
MSD blaster 2
taylor made 8mm wires n crappy ngks
and timing advacement

now, the car didnt feel AS lean with the timing advancement before, the plugs were a hair grey, but now its about 50% worse

thanks

JACK

[D323]

have you been on the dyno since your mods?

Sounds like you are running lean... more air same fuel = you leaning out.

Good dyno session, and you'd probably pick up the lost power and then some on top.

[Mazda_Powered]

there arent any dynos around my area to go to plus my car is going off the road tomorrow due to winter! ah! but D323, if i am leaning out, i would need an adj. pressure regulator ??

i'm almost thinking about a v6 swap now...grr...my friend bought a mx-3 gs for a parts car, but all he needed from it was the motor/tranny/axles. so i can use all the wiring, p/s pump, stuff off his old motor, crossmembers, mounts, all the goodies

JACK

[D323]

your stock FPR should be fine.. you might have a pump that is not pumping enough or a clogged filter or something. I'd check the fuel filter and small stuff before putting money into an FPR.

Although if you plan on turbo or other serious mods, I dont see why an FPR would hurt.

[Mazda_Powered]

awesome, thanks, i'll just change the filter tomorrow when i get paid, pointless on checking it when i dont have the money to replace it

[weelyweels]

have you seen what your o2 is reading at that point... with either a a/f guage or just back probing your o2 w/ a volt meter...

[Mazda_Powered]

well wouldnt that just tell me im running lean though? im trying to source the problem of why its running lean, i can almost feel/smell the difference. because it use to have a fain smell of exhaust once i reved it up to the redline and shifted, but now...no smell.

anyways, i dont have time for the fuel filter today, i dont even know if i'll bother with it now, my friend donated some misc parts from his mx-3 parts car. so im thinking V6 swap over the winter

JACK

[weelyweels]

it is just a suggestion cause unless you have some data to support your theory then your just guessing if it is better or worse... and about the loss of power at the top-end... maybe you improved your midrange power but not your topend and that is why you noticed the difference in power......

but whatever the deal is i hope that you get it figured out.. let us know when you do!!