running lean?

[neogenetik]

hey guys i have a 89 325iC...m20
i hooked up my car to a sun emission tester
and i got some results
and my afr was at 16.8-17.1
i was wondering if that was way to lean
and is there a way to get it around 13s afr

i heard theres a special tool you can adjust your a/f with

my car doesnt run as good as it used to either
i would go WOT and the rpms would go up but it doesnt have the same push it had
i changed oil and plugs....
anything else be the problem




just needing your help thanks
ej

[RobertK]

Injectors? Could go with some 17.5lb e30 M3 injectors and an AFPR though neither are required.

Have you checked to see if your car is throwing any codes?

[neogenetik]

may have some codes
not sure dont have a scan tool to find out

[Rob]

is your motor stock?

[neogenetik]

yes stock motor
w/ JC chip and b&b tri-flo

[Rob]

put the stock chip in and try again.

[demlotcrew]

Bigger injectors are not the way to solve this problem!

You may have a air leak around the inlet manifold.

Andrew

[Rob]

Andrew- are we seeing a pattern here? :p

[Mystikal]

Bet you it's the chip combined with the stock aging fuel system. It was in my case. Do what Rob said, put the stock chip and try again.

[demlotcrew]

Andrew- are we seeing a pattern here? :p

lol

[bddog]

Make sure you have no intake leaks. The intake boot can hide a big leak.
Oxygen sensor. Needs replacing every fifty to seventy thousand miles, or as soon as it goes bad.This will throw your mixture off.
Temperature sensor. or wire. A bad one will make your ECU think your engine is cold. I always thought a 15 to 1 fuel mixture was optimum. Am I wrong?

[neogenetik]

thanks guys
i will be doing that this weekend once i get the chip from my old house

[Digitalwave]

I always thought a 15 to 1 fuel mixture was optimum. Am I wrong?

Stoich is 14.7:1, but that isn't really the optimal A:F ratio. It depends on the application, but you want more like 13-14:1.