Rb20det Running Terribly Rich

[DJ420a]

Hey guys, Im from the US. I have an S13 with an RB20det installed.

Heres what Im workin with...

Rb20det

Precision SC61 turbo

Z32 MAF

750cc RC injectors

Nismo bypass to Aeromotive FPR

Walbro 255

ROM tune with Ostrich and Carl H's assistance

Consult

Innovative wideband

Here's my prob.....

I run VERY rich at idle and at cruising speeds. Under load and boost the motor performs great.

I run so rich, my WBO2 reads "9.8".

Everything Ive checked, checks out fine. When I hook up the consult, everything "seems" too be running and checking out to spec.

MAF .50 key "on"

TPS .44

????O2.......which is reading .95 lambda = 14.0 AFR???

ECT within spec

Fuel Pump within spec

Timing 15*

Ive checked voltage and ohms on everything I can think of and its all fine and Ive changed the plugs 4 times now.

On Carl H's end, everything checks out to what its suppose to be with the ECU, according to him.

I'm at a loss guys, does anyone have any ideas on what else too check that would be causing these probs?

The weirdest thing I see the stock O2 sensors readings. Its not reading what the WBO2 is..not even close.

[blind_elk]

Was the ROM tune done on a dyno, or just a "these numbers should do" setup?

[mad082]

the stock o2 sensor isn't a wideband sensor. it is only designed to read between 14 and 15:1 and send the ecu a signal of either lean or rich. anything leaner than 15:1 it says rich, anything richer than 14:1 is says rich and in between is stoich. they ecu doesn't actually monitor the exact AFR.

it may possibly be that the stock o2 sensor is dead and that is why you are getting shocking economy, or the closed loop tune may be innacurate, or not even activating, however then it should just run on the same map as wide open throttle. i would be leaning more towards the tune than the o2 sensor.

[DJ420a]

I agree, today I did some test and came too the conclusion that the O2 sensor is fine.

I did find some, what seems too me, odd findings during my search today.

Let me ask in the form of a question lol

If I would check for continuity between the 2 pins of an injectors pigtail, should I get continuity?

I also put one side of the ohm meter in one side of the injector pigtail and check down at the ECU and I had continuity from the #6 pigtail to all the injector signal wires at the ECU.

I then put the one side of the ohm meter on the other pin of the same pigtail and did the same test and got continuity on all the same wires.

......does this sound right?

[Dorifta]

if oxy is ok, your air flow meter or fuel mixtures are way out or even injectors, u have an aftermarket rom so start fiddling with fuel, then try air