this is kinda strange but, this thing idles pretty good gets a little strange at idle but, 42# inj. seem to be giving alot of us issues at idle. (runs perfect but if you get a really long light it starts to hunt for idle (+/- 200-400rpm) once I raise the idle with my foot it stops

now as far as the stalling it is strange since I can drive the car around for hour or so but, after that time frame when I go to slow down it stalls when I push in the clutch.

I was thinking of setting the idle tables the same as when it is cold but, this does not control the idle follower which is what I think is what is wrong. (and also because it is fully warmed up before it acts up)

I only have a few things to iron out and this ecm will be 100% drivable (like if it was a factory setup)

 

If your IAC is less then 30, that may be part of the problem.
Is your MAT located in the plenum?.
If I'm not mistaken there is a flag for manual tranny, got that set?.

Might add some timing to the idle timing correction tables, I have mine set for 6d.

 

grumpy, my Iac is in the stock location for the tpi plenium, the manual opt. is selected but, I am at a loss on what you mean by my idle spark correction table? I must be over looking that table somehow? the IAC is set up just like the stock ty/sy bin. which has..
Deg. C...Steps
-40...........144
-28...........144
-16...........144
-4.............130
8..............110
20.............80
32.............70
44.............30
56.............25
68.............20
80.............10
92..............0
104............0
116............0
128............0
140............0
152............0

 

You have to scan the engine to see what the IAC counts are, to compare to the number I gave.

Here's 2 pieces of code for the timing correction, on is source code, and the other shows the locations in the .bin file were they are.


;--------------------------------------------------
; F88
;--------------------------------------------------
C6C3: FCB 3 ;
C6C4: FCB 5 ;
C6C5: FCB 9 ;
C6C6: FCB 17 ;
C6C7: FCB 26 ;
;--------------------------------------------------
;--------------------------------------------------
; F89
;--------------------------------------------------
C6C8: FCB 6 ;
C6C9: FCB 14 ;
C6CA: FCB 23 ;
C6CB: FCB 28 ;
C6CC: FCB 34 ;
;--------------------------------------------------


F88:
;Idle Speed Stabilizer Spark Compensation vs Positive RPM Error
;Deg
FCB 18 ; 0
FCB 18 ; 25
FCB 18 ; 50
FCB 18 ; 75
FCB 18 ; 100
F89:
;Idle Speed Stabilizer Spark Compensation vs Negative RPM Error
;Deg
FCB 18 ; 0
FCB 18 ; 25
FCB 18 ; 50
FCB 18 ; 75
FCB 18 ; 100

 

ok, I went out and checked what the iac was reading at idle and off idle..... at idle it reads from 2-8 and off idle is 0 (warmed up) it is trying to idle at 600 rpm

as for the info you gave me I guess I will have to do some more research to understand how to use it

 

Try backing down the min idle speed a little and see if raising the IAC at idle to like 20 doesn't help.

In the first tables, those are the physical locations in the .bin file, for the two tables. The second set are values, and comments as to what exactly they are.

 

would I be better off using a program like or in my case "ECM Definition File Editor"(tunercat program)? so I can insert the location you wrote. since I am already using there other program?


thanks a ton for your help. I know you seem to have your hands full helping out everyone

 

That would be one way.
Any more thou, if I'm not using Source Code, I just use a Hex Editor program, and make the changes I want, and then run it thur say TC, to redo the checksum.

It pays, in the long term, IMO, to be able to *think* in Hex.
Well, except for Doc, he got to where the Bank Tellers just couldn't stand to see him standing in the Drive Up Lane.
No, you don't want to know.

Your Welcome.

 

An off-idle IAC count of 0 which is less then idle counts doesn't sound correct. Something in the cal is setup wrong.

RBob.

 

well that's just off idle like 2% throttle pos. while driving it has counts but, they constantly move around depending on specific load and %

maybe I will have to find the software at work so I can down load my scan tool readings. I think it would be easier if I could show what everything is doing

 

After I did my singleplane conversion, and resetting iac, my counts are like 130 something at idle.

Gotta drill a few small holes in the TB blade.

-- Joe

 

OK, that makes sense (ECM is still in idle mode with 2% TPS but the blades are cracked a hair so the ECM tries to bring the idle back down).

Do you have a datalog of the stalling? It sounds as though something is heating up and causing the stalling. Of course the $64k question, what: coil, ignition module, pickup coil, injectors, vapour lock, ECM. . .

RBob.

 

I have not had any time to do any driving with the car yet so I don't have any data logs, (it acts more like a IAC problem) plus it was all ok before the $58 swap.


grumpy, I have the tables in tuner cat now but, I get a (runtime error "6" overflow) any Ideas?

 

also, just a guess but, the famous $60 code already had these things added?

 

we don't have the stuff at work to do the down load for the data. I did get a chance to drive it and found the idle at 750rpm with the spark like you said seems to idle better but, when I sit at a light after a few min. I get a large hunt. and then it corrects it's self?

Iac is at 25-28 now

also for some reason my car is off the 128 mark now? it used to cruise around 128 and now it is off. did the Iac change this?