zz17iroc

iTrader: (4)

Fellas, I've been having some issues with my car. All of my mods are in my sig, but the real issue has been trying to get my Lucas 42lbs injectors working properly. Just know I replaced my Ford green top 42lbs injectors thinking they were the issue, but that did not fix the problem. I've done a search and some things have pointing me in the right direction although some solutions did not work for me. I did play with the INJECTOR PW CORRECTION VS. BATT VOLTS table and I believe RBob mentioned in one post to zero out the LOW PW INJECTOR OFFSET VS. BPW table too but I have not done that yet. I think it helped a lillte but I'm not too sure. I just conducted a compression test which yielded good results. But the plugs were glazed and wet with fuel due to my PW issues. So that could be part of my problem too? I'll be sure to put a fresh set of plugs in anyway.

What I've done so far:

1. Tried to tune just in Open Loop(OL)- The car ran some what smooth at idle and my Wide Band o2(WB) was pretty much staying around 14.8 to 15.1.

2. Tried Tuning in Closed Loop(CL)- As soon as it goes into closed loop the idle becomes unstable and not smooth, the BLMs are pretty much staying 122-126 and INT was all over the place.

Note: Like I said before I have yet to install new plugs after the compression test, so the ECM maybe trying to compensate. But then again why does it idle smoothly in OL?

One more thing:

I recently installed a set of MARCH AMP series under drive pulley set and that's when I started to have these issues with the car. Do you thing it's messing with my voltage because I'm seeing 14.0 at the battery and 14.3 at the fuel pump for voltage? I'm just confused. I will attach a copy of my current bin I'm using. It seems like no matter what I change in the bin it does not fix the issue. That's why I swap out injectors. Thanks for your help.

Orr89RocZ

iTrader: (20)

Big cam + closed loop using narrow band o2 sensor can have some issues at times. There should be some o2 milivolt offsets for rich lean that you can adjust to ignore the fresh air in the exhaust from cam overlap.

Also I believe in 8D you can set closed loop to come in at a certain rpm and leave open loop at idle.

What does the wideband say at idle in closed loop when blm is 126 or so and INT is all over the place?

Does the car run 128 BLM/INT during part throttle cruise? How about in park, but press throttle down til motor is hovering at say 2000 rpm? If air fuel is near stoich and BLM is 128 or so while in park and reving to 2000 rpm, then chances are it is an o2 sensor milivolt offset problem at idle due to overlap of the cam.

DENN_SHAH

iTrader: (1)

other than the timer function i don't remember seeing anything for open loop idle in the stock 8D mask, but i could be wrong.
in S_AUJP_V4 there is a setting for open loop idle.

zz17iroc

iTrader: (4)

I've always know about reversion and big cams I've read UltraZ's thread about it years ago, but it seems like this started after I installed that pulley set, but the glazed plugs could have caused some problems too. I've been using using AR 3923 for 5 yrs because my CR is 11.2:1.

WB bounces around from 13.8 to 16.4 and the NB o2 wound do the same going as low as .098- .8XX of course because of the cross counts.

I have done something similar to that, but when I did it the car had a hard time maintaining a smooth idle and began to stumble a bit.

RBob

iTrader: (1)

The injector compensation values are important. With the underdrive pulleys the alternator voltage is probably fluctuating a little. Can try a higher idle RPM as that can help.

In closed loop the surging is caused by the proportional gains. Need to reduce them by the ratio of displacement to injector flow. For a base line use the stock values of 350 ci and 22 #/hr:

350 / 22 = 15.9

383 / 42 = 9.1

Then:

9.1 / 15.9 = 0.57

So need to multiply one of the proportional gains tables by 0.57. In $8D there is a reducer for prop gain when at idle, that most likely can be left alone. I looked as other masks have separate terms for prop gains when at idle.

RBob.

zz17iroc

iTrader: (4)

So correct me if I'm wrong, I need to multiply everything in my Injector PW correction vs. Battery Voltage Table by .57. If so I'll try it after replacing the plugs tonight. Again thanks for every ones help I really do appreciate it!!

Craig

RBob

iTrader: (1)

No, in one of the two proportional gains tables.

Do it to the table that has the highest values.

RBob.

zz17iroc

iTrader: (4)

Now I am officially lost. I do not know how to read code or even have the ability to look at my own code in the bin file I am currently using. Don't get me wrong I'm always up for a challenge, but I'm like a fish out of water. Guess I finally have to learn how to read code.

Orr89RocZ

iTrader: (20)

What are you using to tune this? Tunerpro has a few tables for these gains/errors in super AUJP xdf...but not sure its in the basic 8D XDF. I didnt see it but may have overlooked

zz17iroc

iTrader: (4)

I'm using Tuner cat and TunerPro RT. The Bin I'm using is super AUJP V4 with the Nsvram hack. We both know Tuner cat does not have the tables, but I have also been looking through TunerPro like crazy.

Orr89RocZ

iTrader: (20)

with the super aujp xdf I believe the tables are closed loop parameter - prop gain vs air flow and prop gain vs error or something like that. Theres one about prop gain duration vs error but not sure what that does.

zz17iroc

iTrader: (4)

Okay I found what you are talking about, I'll go out test it out. Thanks

Craig

JP86SS

iTrader: (1)

That's why its best to look at the address of the item and not the text name.
Naming conventions are different everywhere you look.
Names can change, the address or location of the variable will not change.
In TP hit the "F7" key and sort by the address valve (click the grey header bar to sort)
The $8D definition begins at $8000 address so looking at the item listing, this table would start at location 4CF

There should also be a way in TC to see the address location, I'm just not familiar with it.
HTH

zz17iroc

iTrader: (4)

Thanks JP86SS I found it. I also took of my under drive pulley set off and re-installed the stock ones. I 'll see if this helped any.

zz17iroc

iTrader: (4)

UPDATE:
Car is fixed, both sets of injectors were fine my hot wire kit was not properly grounded and moved the o2 sensor back to the collector on the driver side. I put it in the y-pipe because I just got new coated headers and did not want to weld a bong on. Now the car runs like a sewing machine. Always easy fixes!!!!!

Craig