I can’t adjust the A/F at idle to keep it at 14.X to 15.X

[CarlosPTR210]

I can’t adjust the A/F at idle to keep it at 14.X to 15.X, I adjust the mainscale and the lowtune with out luck.

What can I do?

Source File: PTR210 Test 03 July 24 '08.bin

Source Definition: TPro4800.xdf


Airflow Source 0x00 Select

Barometer Comp Mode 00

Freq In Mode 11

Aux 1 mode 01

Main Scale 30.00

Volts Out 1 Setpoint 2.45

Volts Out 2 Setpoint 3.53

Afterstart enrichment 5.00

Tune Load Point, Low 36.40

Tune Load Point, Mid 100.10

Tune Load Point, High 143.00

FE Smoothing 30

AFR Min TPS 3.00

AFR Min RPM 3200

AFR Min Load 150.89

AFR correction lean limit 11.60

AFR correction rich limit 10.00

AFR correction gain 4.00

TPS Enrichment 0.48

TPS Decay 0.80

Throttle Body Size 8

TPS MAP Max 104.06

MAP Enrichment 0.40

Boost Enrichment 0.40

MAP TPS Min 0.44 Volts

MAP RPM Min 704.00

Part Throttle Tracking Idle TPS 0.04

Part Throttle Tracking Idle RPM 640.00

Part Throttle Tracking Idle A/F Ratio 14.80

Part Throttle Tracking Lean A/F Ratio 10.00

Part Throttle Tracking Gain 5.00

AFR Tracking: A/F 11.5

VE table: 2

AF User Tune Lo: -10%

 

[drjonez]

Is the stock O2 sensor connected?

 

[CarlosPTR210]

Is the stock O2 sensor connected?

yes.

I modify the mainscale, but keep the same lower A/F.

main scale is at 20

 

[CarlosPTR210]

The MP at idle is 23 to 25, the engine is in cool runing

 

[90T04]

You wont be able to adjust the idle A/F ratio without a standalone. When in closed loop, the ECU will always compensate for any airflow calculations using the O2 sensor as input.


What I do is adjust my fuel pressure to get a Vf of 2.5 at idle. Then adjust your mainscale so that your vf stays around 2.5 when cruising and part throttle.

When you have your mainscale down, adjust your low mid and high throttle points to fill in any lean/rich spots. When you do high throttle, I recommend using a dyno. Not too easy to do it on the street.

If you wire your vf signal into the Maft pro, you can log it in realtime and record it alongside throttle position, Hz output, wideband o2, etc. It makes it a lot easier to tune.

To get your engine running smoothly on a piggyback unit, you really want to get them fighting eachother as little as possible.

Ryan

 

[CarlosPTR210]

You wont be able to adjust the idle A/F ratio
What I do is adjust my fuel pressure to get a Vf of 2.5 at idle. Then adjust your mainscale so that your vf stays around 2.5 when cruising and part throttle.

If you wire your vf signal into the Maft pro, you can log it in realtime and record it alongside throttle position, Hz output, wideband o2, etc. It makes it a lot easier to tune.

Ryan

I conncet the VF to tha aux1 of teh map, in with opcion of the maftP I can check it?

Aux1, Aux2, VE, I don't know

I drive the car, the idle A/F is low, but when is crusing is alittle rich, but I can feel the poser lol

 

[CarlosPTR210]

Bad news.

MY car continue with the lean at idle 18.3 A/F. If I boost or increase the RPS increase & TPS Volts increase, the AF got to 14. X to 15.X, I have the problem only at idle or slow crossing.

Additional Info:

Hac disconnects
THA resistor 2.2k / Maft wire disconnected

Set up.

Main scale: -10

AFR
Min TPS: 2.26
Min Rpms:2208
MinLoad:166.5
TPS enrichment: 0.50
TPS decoy:0.80
Throttle body size: 8 ( I have a Q45 TB 90 mm)
TPS Map max:104.6
Map enrichment: 0.65
Boost enrichment: 0.65
Map TPS min: 0.56
MAP RPM min: 928

Part Throttle
Idle TPS:.56 (current value 0.46) E2 and Idle in TPS are in short
Idle RPMS: 896
Idle AF: 14.2
Cruise tps: 1.6
Cruise rpms:2208
Cruise load: 119.67
Lean Load: 100.16
Lean AF:14.5
Lean again: 12.5
Starup delay: 70.59
Enhanced TPS RPM Threshold: 2176
TPS load thereshold:85.33

Note: why some time when I record the reading, only store few seconds?, what I do wrong?

By the way If I drive the car with lean idle is bad?, the A/f I around 18.3 and some times climb to 14.X.

The EGT gauge always is below 1100 F, sensor is in the 6 exhaust runner.

 

[7MGTEsup]

Bad news.



Part Throttle
Idle TPS:.56 (current value 0.46) E2 and Idle in TPS are in short
Idle RPMS: 896
Idle AF: 14.2
Cruise tps: 1.6
Cruise rpms:2208
Cruise load: 119.67
Lean Load: 100.16
Lean AF:14.5
Lean again: 12.5
Starup delay: 70.59
Enhanced TPS RPM Threshold: 2176
TPS load thereshold:85.33

I'm not sure about your lean idle but some of your ptt numbers seem a bit off.

Cruise tps looks high, on my car tps is reading about 0.8 - 0.9

your cruise load is in posative boost 119.67 my cruise load on a flat and leavel road is about 0.7 - 0.8 at 70mph

 

[CarlosPTR210]

I'm not sure about your lean idle but some of your ptt numbers seem a bit off.

Cruise tps looks high, on my car tps is reading about 0.8 - 0.9

your cruise load is in posative boost 119.67 my cruise load on a flat and leavel road is about 0.7 - 0.8 at 70mph

so waht do you sugest for the cruise load: ??????

and theank sor your suppor

 

[7MGTEsup]

so waht do you sugest for the cruise load: ??????

and theank sor your suppor

Take the car for a drive and cruise at the speeds you would normally drive and look at the load it should be about 70 - 80kpa.

 

[Doward]

What's the TCCS reading on the VF line when the wideband is reading lean?

My idle was 14.5-15.1, VF @ 2.50v

 

[89turbotoy]

do you have a exhaust leak b4 the wb sensor this happened to me and i thought i was idleing @ 18.7-1 afr fixed it and found it to be in th 12-1 range

-Zac

 

[CRE]

Have you tried disconnecting the stock O2 sensor? The two systems may simply be fighting eachother...

As 89turboboy suggests an exhaust leak is another possibility, but I'd try disconnecting the stock O2 sensor real quick... easy enough to test.

 

[CarlosPTR210]

What's the TCCS reading on the VF line when the wideband is reading lean?

My idle was 14.5-15.1, VF @ 2.50v

4.43V :cry:

Before the Maftpro set up, the idle was normal with the Lex MAF and the SAFC II.

What can I do? :1zhelp:

 

[CRE]

Just about every likely problem has been listed. Read through the responses to your own thread and then read the manual and the walk through posted on here.

The SAFC-II doesn't try to adjust fuel to reach a given AFR it just adds or pulls a given % for a given RPM and load.... there's a HUGE difference. With the SAFC II installed, unless you've unplugged the stock O2 sensor, the ECU is still adjusting the fueling 90% of the time.

Here's a hint (for the, what, third time?), turn off PTT or remove the stock O2 sensor... one or the other, pick. PTT doesn't include WOT AFR Tracking.

 

[Doward]

Don't even use PTT. I take it you are running in SD mode? Set up your VF on an auxilary 0-5v input line, so you can monitor it. Adjust the VE maps directly via TunerPro to get everything perfect. Get your idle so that VF reads 2.50v, then go for very light throttle adjustment. Tuning the VE table will give you a VF of constant 2.50 at part throttle - remember, the MAFT-Pro is NOT a standalone - let the TCCS do what it was designed to do

 

[89turbotoy]

Just about every likely problem has been listed. Read through the responses to your own thread and then read the manual and the walk through posted on here.

The SAFC-II doesn't try to adjust fuel to reach a given AFR it just adds or pulls a given % for a given RPM and load.... there's a HUGE difference. With the SAFC II installed, unless you've unplugged the stock O2 sensor, the ECU is still adjusting the fueling 90% of the time.

Here's a hint (for the, what, third time?), turn off PTT or remove the stock O2 sensor... one or the other, pick. PTT doesn't include WOT AFR Tracking.

don't mean to thread jack but if one were to disable ptt and only tune in wot could you still use wot tracking? if so what would the settings be?

 

[CRE]

don't mean to thread jack but if one were to disable ptt and only tune in wot could you still use wot tracking? if so what would the settings be?

WOT AFR Tracking and Part Throttle Tracking are separate systems. You may use either without the other. I've posted more details to your own thread.

 

[CarlosPTR210]

Well,

I make few tests yesterday.

Test 1: Unplug the O2, the voltage in VF was at 0.025V also during crusing, at idle the wide band display 18.3

Test 2: Plug the O2, first when turn on the engine, the VF was at 3.5V, after one minute change to 4.4V, also during cruising, only change when I release the throttle, the VF change to 0.0X and the return to 4.4

So tomorrow I’ll disable the PT and see what happen.

Also I will send the car to the shop next week to search for any exhaust leak.

Because the WB display 18 and the VF 0.0X with the O2 unplugged, like the members said, the engine will have some exhaust leaks.

The car is running in Speed Density mode.

By the way, other issue is after I change to the Maft set up, the car at idle show 13 to 15 of vacuum, and before with the other set up was 17 to 18.

What do you think?

Thanks and regards.

 

[CRE]

Is that vacuum while you're running lean? Then, yeah, there should be a difference than when you're running well.

Vf isn't terribly helpful (for that specific purpose) if you're tuning without the O2 sensor. Pretty much the only time it'll change from being close to zero in that situation is if the ECU starts adding fuel due to some other error.

Do you have any diagnostic codes stored?

You're running quite lean at idle indeed. Could be an exhaust leak, could just be your tune. From my own experiences, I usually need to add fuel in the 400 and 800RPM spots in the Low Load Map to get my idle in line. What's your low load fuel map look like?

With Idle PTT enabled look at the SensorMonitor screen on the pro and check the CF (correction factor) value... this is how much fuel the MAFT Pro is adding to your tune try and reach the desired AFR. (Again, this only works without the stock O2 sensor connected.)