Hi if anyone can help me out and have a look my data log wb gauge all over the place running lean running rich wont let me post here so need to send to someone email. Motor is almost a year old and never tuned right and worried about the damage it could be doing. thanks for any info or help

 

You can zip the file or rename it as a .txt file to post.

RBob.

 

Hi hope the zip file worked

 

Data file zip

 

Are you tuning it yourself ?
what bin did you start with ?
are you incorporating the wb signal into the data stream d8 of the ecm ?
Im assuming your using the 165 ecm.

 

yes tuning myself was a modified bin from scott hansen I added 30lb injectors no wb to ecm just to a gauge right now

 

K figured it out any help would be great thanks

 

the other

 

Tim...

I'm going to reply here rather than by e-mail so that other people can see it and offer comment, because I'm not at all familiar with MAF cars, so I can't delve into it as much as I could if it were a MAP car.



But the reason you're seeing it go from lean to rich very fast is because you're probably seeing it go from open to closed loop. Something global (or localized to the side of the engine with the NB O2) is causing the ECM to react by adding a ton of fuel when you get into closed loop. Whatever it is, it's convincing the ECM that you're running lean and it's responding by adding fuel.



If the WB is seeing a lean condition on the passenger side during open loop, that tells me you likely have a engine-wide lean condition. When the ECM gets into closed loop it sees the lean condition and reacts accordingly. It may be that the driver side is leaner than the passenger side, since when the ECM trims out the driver side, it's over-fueling the passenger side.



How's your ignition system? Fuel pressure? Fuel pressure regulator?

 

Hi M, last time we talk you said drop fuel pressure its at 25 vacuum on I use msd6 and yes to fuel pressure regulator. I have gone over everything that could cause it to go lean.

 

25? Wow, that's low... and you're still at 108 BLM.

What is your injector setting in the bin?

 

wow 25 psi, how old is your pump ?
I don't see how you can have blm numbers like this with that pressure. are you sure your gauge is accurate ?

 

yes its reading 25 26psi and vacuum pulled off 34psi pump is walbro 255 and is 19 yeas old but hasn't drive much in the last 10 years.

This is 383 tpi ported vortec heads and plenum and bigger runners and 58tb. high flow cold air intake. LT 4 hot cam kit. Walbro 255 fuel pump . High flow oil pump. 13/4 long tubes headers with heated o2 on drivers side and the WB on the passenger side.

 

The reason that it is rich and the BLM is pegged at 108 in cells 0, 2 and 6 is the grossly inflated MAF readings. Its idling over 16 gm/sec on average. Check the MAF calibration tables first.

Post a copy of the bin or a text export.

 

here is a copy of scott's tune. looks like maf 1-3 has been changed.

 

Took a look at the bin. Mostly looks ok except large maf table 1 and 2 values. Esp table 1. Almost double what i think it should be. Cut it down to near stock arap maf 1 and 2 and see what happens

 

# 1 is what i have on my current chip I tried to lower to #2 and 3 and wont start fan on and smell fuel out tailpipes this is the only thing i changed on new chip.

k sorry just noticed chip is not working i will try these changes on simulation mode and post results

 

If the fans on that’s a sign it’s not running off the prom it’s in limp home mode.

 

car idles wb 11.6 and every 10 sec jumps to 19 with rpm what to i need to adjuster here for that?

 

This look ok guys?

 

It *looks* alright but that doesn't mean much. How does it run?

What do you mean when you say the wideband "jumps" every 10 seconds? "with rpm"? Be more specific.

An O2 that jumps to lean periodically sounds like an occasional misfire to me.

GD

 

finally have wb 13 to 15 while driving but when i take my foot of the gas it will go wb 11 or 10 and some times from there spike up to wb 19 stay there a few sec unless i hit the gas.

 

Goin lean could just be fuel cut in dfco mode. Pretty normal

 

This last tune you sent me , idle looks to be 118 blm . Above idle to 1800 66gps is 108 blm.
you didn’t hit much higher than that in cl so it’s hard to say what needs to be done in that fueling area.
defiantly reduce fueling in the lower rpm range 1-3 maf tables.

 

The vacuum created in the plenum on a decel will flash the fuel droplets on the inside surface of the manifold off to vapor and increase the AFR. And as mentioned by Orr - the Deceleration Fuel Cut Off feature will kick the AFR way up because effectively it shuts off the injectors. This is by design. The AFR when you are coasting with the throttle closed is not all that important as long as it doesn't cause issues with surging, transitioning back into the throttle, or after-burning and huge fuel economy losses..... the kids love this - the burbling and flames on decel - inject a whole bunch of fuel and jack up the ignition timing so it all goes out the exhaust valve and shoots flames out the tail pipe.

GD

 

this is the best i have got the car to run in 2 years can anyone have a look with suggestion or tweaks thanks

 

 

It is still very rich. Where it has learned in BLM's they are very low - 118 or so. The INT is pegged low in many of the places where BLM's have not yet responded. You may need to increase the injector size constant since you have already lowered the fuel pressure much farther than I would be comfortable with.

Also your idle is around 750, but the requested idle speed is 650 and the IAC counts are zero. You need to reset the minimum idle air, and adjust the TPS voltage, etc. You should be at 15-20 IAC counts at idle. Right now the throttle blade is propped open and the IAC is closed and it still is unable to achieve idle target because there is too much airflow.

On the good side it's not lean, and there's no knock counts. So that's good. But there is much improvement to be made.

GD

 

hows that look?

 

BLM and INT look good but need a longer log file with more time spent in higher load areas. But looking much closer now.

The IAC position is now too high. Should be 15-20. It's up at 50+. Need to open the throttle blade a little. TPS voltage should come up when you do that as it is also now low - around 0.45v. Should be about 0.54v

GD

 

readjusted timing to 6 degrees iac rpm to 900 and 900 in the bin tps .54v and I can not get IAC motor between 15 to 20 and it is new

 

So went back to stock tb my idle and IAC are still high

 

I've been going through logs and emailing Tim here about his situation and was focused in on his IAC counts, BLM's and INT's, etc and for a while didn't notice that every log seems to exhibit different and random CEL codes. Most of the time there is a VSS Error code 24 - but not always, and the last few logs (in which he says it barely runs cold, and wants to idle at 2000 rpm... which I don't see reflected in the log), and is throwing a code 51 "PROM Error" which I have never encountered before.... doesn't that mean it's running on the limp mode resistor network?!? In other logs I have seen codes 36 "Burnoff malfunction" and 42 "EST Error"..... seems like either a bad ECM, bad PROM/Socket, or maybe a grounding issue? The ECM voltage is showing 13.8 in every log which is low but not really "problem" low and fuel pump voltage matches..... hey Tuned Performance - any ideas where Tim should go from here? There's too many random codes being thrown for me to be comfortable that this is going to run correctly with just some tuning. I think diagnostic/repairs are in order.

GD

 

Hmm, random malfunction codes. Check the battery cables, that they have good contact and are tightly fastened. To both the battery and stater/block.

If that doesn't fix the issue then most likely the ECM is bad (not the first time this has happened).

When code 51 is active the ECM is no longer running from the entire firmware loop. And the SES/CEL should flicker.

RBob.