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openloop
Joined: 22 Dec 2005
Posts: 81
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 Posted: Sat May 19, 2007 6:22 am Post subject: CA18DET/550cc/Z32AFM non Lambda idle problems |
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Hello, I have some idle problems with my CA.
I have perfect cruising A/F (15), full boost is OK (11.5 - 12)
But on idle it is far too rich (12.5 - 12).
I tried lots of things!
When I lean bottom end of fuel map I get poor mixture at idle for a few seconds (17 - 18 when very leaned at bottom end) but it always goes back to rich alone (13 - 12.5).
I also tried to reduce Injector latency, I went from 4C to 3F with very poor result.
If someone experienced similar behaviour and could help me it would be great!
Thanks! |
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louiswun
Joined: 02 May 2005
Posts: 123
Location: Hong Kong
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| Posted: Sat May 19, 2007 8:31 am Post subject: |
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Are you sure you are using non lambda base rom file on a non-lambda ECU ?
I used to have the same problem on my CA18DET S13, I have two ECU with different parts number, even using the same rom, the Idle mixture is different.
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Louis
S13 CA18DET
444cc Injectors, S15 Turbine, AFM Max Out @0.8Bar
Drift Video : http://www.youtube.com/watch?v=RbWVPQaCFqc
Nissan ECU tuning learner in Hong Kong
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openloop
Joined: 22 Dec 2005
Posts: 81
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| Posted: Sat May 19, 2007 9:07 am Post subject: |
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Thanks for your answer.
I'm using MECD009 base soft with MECD009 base ECU. |
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openloop
Joined: 22 Dec 2005
Posts: 81
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| Posted: Sat May 19, 2007 4:14 pm Post subject: |
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If it can help,
When I am cruising (From 1200 to 2800RPM) at light gas pedal, I have between 15,2 and 14,7 A/F and in the fuel map it corresponds to an approximatively 188dec area
At full load (1 or 1,2 bar depending on boost controller settings) I get between 11,5 - 12 A/F with between 80 - 90 dec in fuel MAP.
My K is 163hex.
I am dreaming of a beautiful 14,7 @ idle, you can't imagine!  |
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LMQT
Joined: 06 Aug 2005
Posts: 144
Location: France
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| Posted: Sun May 20, 2007 1:30 pm Post subject: |
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| openloop wrote: | | At full load (1 or 1,2 bar depending on boost controller settings) I get between 11,5 - 12 A/F with between 80 - 90 dec in fuel MAP. |
80-90, are you sure ? 
| openloop wrote: | | I am dreaming of a beautiful 14,7 @ idle, you can't imagine! |
Have you try to put around 160 in the lowest square of the fuel-map ?
Already seen similar problem on big AFM (RB20/25DET and VG32DETT), surely due to too much big body for the CA18 
_________________
200SX RS13 Zenki (w. CA18DET)
280hp & 330Nm @ 16PSI (GT25R) |
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tineira
Joined: 10 May 2005
Posts: 60
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| Posted: Sun May 20, 2007 2:11 pm Post subject: |
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| openloop wrote: | Thanks for your answer.
I'm using MECD009 base soft with MECD009 base ECU. |
Non lambda ECUs use a 4th wire on the MAF. This wire is used to adjust fuel at idle. I measured the resistance between this cable and GND and Voltage on the original CA18 MAF while moving the idle adjust screw. This are the results:
| Code: |
Idle screw position | Resistance with GND | Resistance with Positive V
----------------------------------------------------------------------
Full CCW | 0 ohm | 2 kohm
Full CW | 1 kohm | 1 kohm
Standard Position | 500 ohm | 1.5 kohm
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What I did was to install that 4th cable connected to the middle leg of a 1 kohm potentiometer, one leg to GND and the other to a 1 kohm resistor and then to battery positive. I try to adjust the K value riding on light load with a fuel map with no corrections, and then get proper idle adjusting this screw. |
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openloop
Joined: 22 Dec 2005
Posts: 81
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| Posted: Mon May 21, 2007 7:07 am Post subject: |
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| LMQT wrote: | | openloop wrote: | | At full load (1 or 1,2 bar depending on boost controller settings) I get between 11,5 - 12 A/F with between 80 - 90 dec in fuel MAP. |
80-90, are you sure ?
| openloop wrote: | | I am dreaming of a beautiful 14,7 @ idle, you can't imagine! |
Have you try to put around 160 in the lowest square of the fuel-map ?
Already seen similar problem on big AFM (RB20/25DET and VG32DETT), surely due to too much big body for the CA18 |
Yes, 80 - 90 dec.
60 - 70 is too poor: 14 A/F at full load
Yes, I tried 160 in the lowest square: at idle, A/F drops to 18 - 19, car hesitates, then it goes back ALONE at 13 - 12,5 A/F. !!!! |
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openloop
Joined: 22 Dec 2005
Posts: 81
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| Posted: Mon May 21, 2007 7:11 am Post subject: |
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| tineira wrote: | | openloop wrote: | Thanks for your answer.
I'm using MECD009 base soft with MECD009 base ECU. |
Non lambda ECUs use a 4th wire on the MAF. This wire is used to adjust fuel at idle. I measured the resistance between this cable and GND and Voltage on the original CA18 MAF while moving the idle adjust screw. This are the results:
| Code: |
Idle screw position | Resistance with GND | Resistance with Positive V
----------------------------------------------------------------------
Full CCW | 0 ohm | 2 kohm
Full CW | 1 kohm | 1 kohm
Standard Position | 500 ohm | 1.5 kohm
|
What I did was to install that 4th cable connected to the middle leg of a 1 kohm potentiometer, one leg to GND and the other to a 1 kohm resistor and then to battery positive. I try to adjust the K value riding on light load with a fuel map with no corrections, and then get proper idle adjusting this screw. |
So Great!
I will try this and tell you the results! (lots of other things to do at this moment so maybe for next month) |
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LMQT
Joined: 06 Aug 2005
Posts: 144
Location: France
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| Posted: Mon May 21, 2007 4:52 pm Post subject: |
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To much things are going wrong : I'm not sure your MAF is OK
Edit : what about the wiring of your MAF ?
Especialy for C and D brushes ?
_________________
200SX RS13 Zenki (w. CA18DET)
280hp & 330Nm @ 16PSI (GT25R) |
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openloop
Joined: 22 Dec 2005
Posts: 81
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| Posted: Tue May 22, 2007 11:28 am Post subject: |
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| LMQT wrote: | To much things are going wrong : I'm not sure your MAF is OK
Edit : what about the wiring of your MAF ?
Especialy for C and D brushes ? |
C and D are wired together to C, black wire of RS13 loom
B is wired to D, green and black wire of RS13 loom
E is wired to B, black and white wire of RS13 loom |
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openloop
Joined: 22 Dec 2005
Posts: 81
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| Posted: Tue May 22, 2007 11:30 am Post subject: |
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| I will also try with a MECD007 base, lambda application, to see if there is any difference, though there is not correction coming from the A wire with this one. |
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LMQT
Joined: 06 Aug 2005
Posts: 144
Location: France
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| Posted: Tue May 22, 2007 6:53 pm Post subject: |
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On cold start, your idle won't be correct with a cat prog.
On warm start it's OK.
If I were you, I'd try with 534cc and S13MAF to try to correctly set injectors parameters.
And after only, I'd re-inject the Z32MAF in the story 
_________________
200SX RS13 Zenki (w. CA18DET)
280hp & 330Nm @ 16PSI (GT25R) |
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openloop
Joined: 22 Dec 2005
Posts: 81
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| Posted: Wed May 23, 2007 5:26 am Post subject: |
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| LMQT wrote: | On cold start, your idle won't be correct with a cat prog.
On warm start it's OK.
If I were you, I'd try with 534cc and S13MAF to try to correctly set injectors parameters.
And after only, I'd re-inject the Z32MAF in the story |
That's what I did before but with s14 MAF.
But I hadn't any lambda probe, so, Idle A/F was maybe already wrong, I don't know. |
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LMQT
Joined: 06 Aug 2005
Posts: 144
Location: France
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| Posted: Wed May 23, 2007 4:45 pm Post subject: |
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| openloop wrote: | | But I hadn't any lambda probe, so, Idle A/F was maybe already wrong, I don't know. |
Sure : I haven't seen this problem with big MAF before I had my wideband
_________________
200SX RS13 Zenki (w. CA18DET)
280hp & 330Nm @ 16PSI (GT25R) |
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openloop
Joined: 22 Dec 2005
Posts: 81
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| Posted: Thu May 24, 2007 7:32 am Post subject: |
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| LMQT wrote: | | openloop wrote: | | But I hadn't any lambda probe, so, Idle A/F was maybe already wrong, I don't know. |
Sure : I haven't seen this problem with big MAF before I had my wideband |
I didn't see there was any problem before I installed a wideband.
Idle is perfectly strong but 12,5 A/F. |
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