Rich/Lean Fuel Mixture - How to Tell and Solve

[Hitman]

There has been a couple of discussions on this topic but I am rather lost in finding it. I know some of you has stated that Japanese cars run a richer mixture.

 

My question is :-

 

1) What would be the causes for the mixture to be tuned to a lean mixture ?

 

2) Besides the Greddy E-Manage that allows you to tune this mixture, what would the agents do if it is discovered the fuel mixture is too lean. Reset ECU ??

 

3) What would be the distinct signs of a too lean or too rich fuel mixture. What would the drivers have to look out for as symptoms ?

 

4) If a CAI have been newly installed, would you need to re-tune your mixture ?

 

Thank you for all the help.

[Cool]

call me to view my car lar, then you will know.

 

picture paints a thousand words...

Edited August 11, 2003 by Cool

[Hitman]

"Piggy backs actually re-maps the Fuel Mapping bypassing the stock ECU."

 

Are piggy backs a complicated procedure or is it better to use ....

 

Would you need a laptop for it. I am not technically inclined with graphs and maps so how user-frinedly is the software ??

[Cool]

Lets take it off line cos I don't want to be mistaken for teaching anyone how to reset their own Mazda ecu and get warranty void..

[Hitman]

Ok

[Hitman]

Ok lar ..... but u stay belly belly far from me lah ... next meetup can ?

 

When u going to Japan ??

[Cool]

I work in Town, can meet up at Kallang Macs, you buy me a vanilla coke lar..

 

Next week.. won't be going MCF meetup often due to work commitments.

[Silver_z]

1) What would be the causes for the mixture to be tuned to a lean mixture ?

E Manage, SAFC, ECU chips, Programmeable ECU, Excessive mod for air intake(ie, turbo, supercharger) without compensation for fuel(fuel regulator or bigger injectors)

 

2) Besides the Greddy E-Manage that allows you to tune this mixture, what would the agents do if it is discovered the fuel mixture is too lean. Reset ECU ??

They will say your fuel pump, fuel regulator, injectors or fuel rail spoil, then charge you a bomb for replacing perfectly alright parts.

 

3) What would be the distinct signs of a too lean or too rich fuel mixture. What would the drivers have to look out for as symptoms ?

Too lean can hear engine knock. Too rich, your car will be jerky and sluggish.

 

4) If a CAI have been newly installed, would you need to re-tune your mixture ?

Yes. Cause if you previously use a SRI, the air intake is much higher than a CAI, due to the less restrictions of a SRI setup. So a CAI will give you less intake, hence creating a richer mixture. If you are talking about modding a stock intake with open pod setup, then we have more air entering thus resulting in a leaner environment, and the tuning must be made to compensate the fuel entering.

[Flaser]

Lets take it off line cos I don't want to be mistaken for teaching anyone how to reset their own Mazda ecu and get warranty void..

Hi Hitman and Cool, can count me in too? Keen to learn more about my own car too.

I work in town too, I can also meet at Kallang.

[Cool]

1. Too much air will make the combustion leaner

 

2. E-Manage has a subset component for Fuel like SAFC (Super Air Flow COnverter). What

it does is that it sense a signal back to the ECU and allow a specific amount of fuel

to combust with the air.

SAFC is an Apexi product.

Reset ECU won't help as the fuel MAP on your stock ECU is fixed. Piggy backs actually re-maps the Fuel Mapping bypassing the stock ECU.

 

3. Too Lean - WHite Smoke

Too Rich - Carbon Deposit at the tail pipe. You need to clean off your tail pipe and

observe over period of time. Blue smoke, is to the extreme. Engine Knocking if you can hear, too late already.. to hear ping, you need a special device.

 

4. Tough answer - You need a Air Fuel Ratio meter to determine at Full Throttle and at

Idle. Normally, if it is too lean, at idle, it will sufer vibration. Too Rich, car

accelaration very sluggish.

 

my 2 cents worth...

[French_porn]

hi cool.

 

just to check with u.

between e-manage and safc,if i buy the 2nd hand one,which is a better catch?

no money to buy 1st hand one

or save the money to buy the 1st hand one?

[Zrun]

Besides the Greddy E-Manage that allows you to tune this mixture, what would the agents do if it is discovered the fuel mixture is too lean. Reset ECU ??

 

You mean "the agent"? They will morph into 10 different agents and charge you 10 times the price... :)

 

Usually too lean/too rich is not indication of bad tuning in ECU, as it is already fixed... It is usually caused by bad O2 sensors, bad crank angle sensor timing..

[Zrun]

you mean it is different than just diconnecting the ECU fuse for 10 mins?

[Cool]

some cars needs to jump the switch to sent a signal to the ecu to "reset"

[Zrun]

What's the difference in features and cost of Greddy EManage package vs Apexi S-AFC?

[Phochem]

... ...

 

3) What would be the distinct signs of a too lean or too rich fuel mixture. What would the drivers have to look out for as symptoms ?

 

... ...

 

 

check your sparkplugs.... the best answer

 

http://www.densoiridium.com/howtoreadusedplugs.php

[Cool]

Firstly, there is a vast difference between Emanage and SAFC.

 

EMange:

 

1. Controls Iginition Timing

2. Controls Knocking (which is better left untouch)

3. Controls Air-Fuel Ratio

4. COntrols Boost for Turbo

5. Add additional injectors

6. Not visible unless you hook on to a E-Profec or laptop (additional purchase neede)

Price S$(750)

 

SAFC.

1. Has display

2. Controls Air-fuel Ratio ONLY (no ignition timing or boost)

Price: S$630

 

You need an ITC which cost S$500 to add on top of your SAFC to get full features of Emanage.

[Jacko]

[/reply]

 

3. Too Lean - WHite Smoke

Too Rich - Carbon Deposit at the tail pipe. You need to clean off your tail pipe and

observe over period of time. Blue smoke, is to the extreme. Engine Knocking if you can hear, too late already.. to hear ping, you need a special device.

---

Can advise where the white smoke come from ah?

 

Cheers.

Edited September 3, 2003 by Jacko