Knock with stock tune at WOT.

[FoMoCoSHO]

Atually the afr should match lambse, not to be mistaken with LAMBDA

Could you explain the difference?

 

[FoMoCoSHO]

Atually the afr should match lambse, not to be mistaken with LAMBDA

Could you explain the difference?

So basically it's commanded Lambda?

 

[curry67]

Is it just one sensor or two?

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[SHOdded]

There is 1 upstream and 1 downstream sensor on each bank, curry.

From:  http://www.myo-p.com/Ford-EEC/EEC%20Help%20files/Files/Lambse%20notes.html
Lambse

Lambse is the A/F ratio that the EEC is commanding or you could call it targeted or short term fuel trim. In a perfect world the Lambse is the A/F ratio that you should see on a wideband.

The value of lambse is calculated from the various fuel tables.

In closed loop operation Lambse is the calculated A/F ratio needed to maintain the set point (14.64:1) as reported by the O2's, and it seems to adjust much faster then KAMREF correction value. In open loop LAMBSE is the a/f ratio that the computer believes is being injected.

Lambda is A/F ratio expressed as a percentage of 14.7:1. Just divide the A/F ratio by 14.7 to get lambda, or multiply lambda by 14.7 to get an A/F ratio. If the lambda is .88, the A/F ratio is 0.88 * 14.7 = 12.936

It's just a percentage of stoich, or 14.7:1 A/F ratio. To convert a lambda value to an A/F ratio just multiply by 14.64. exmp: 1.25 lambda * 14.64 = 18.3 A/F ratio

http://www.efidynotuning.com/ford/fuel101.htm

 

[ajpturbo]

Well said shodded...yes basically the way I interpret lambse is afr should match that...after all compensations the afr should match the lambse....

And shodded 14.069 is what you use for the multiplier instead of 14.7 or 14.64.....those would be for straight gas...the 14.069 must be what ford considers stoic for pump ethanol fuels...that's in the stock tune file

 

[SHOdded]

I just quoted the content of the first link   Yes, stoich needs to be adjusted for the fuel in question.

 

[ZSHO]

I thought it was 14.08 for 0.10 (standard gasoline)could be wrong.  Z

 

[ajpturbo]

I thought it was 14.08 for 0.10 (standard gasoline)could be wrong.  Z

Well that's pretty close...I'm sure if u do a search u would find some small variation...I've seen 14.06-14.3 for e10 gas and e85 is in the high 9's

 

[SHOdded]

A little data on gasoline/e-fuel stoich:
http://ethanolpro.tripod.com/id213.html
http://www.brighthubengineering.com/machine-design/15235-the-stoichiometric-air-fuel-ratio/

 

[curry67]

Well I figured out I have a highschool friend who's been a ford tech at a dealer in my town for 8 years so I finally found someone that will care.

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[SHOdded]

That's awesome, curry, looking forward to hearing some good news re the SHO for a change

 

[curry67]

Ya I'm thrilled man. Lol dropping it off in few days hopefully asap lol

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[curry67]

Well my buddy checked it out said everything was good. But based off my logs he will replace the o2 on warranty. Pretty excited can't wait to get the car tuned again

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[ajpturbo]

Well my buddy checked it out said everything was good. But based off my logs he will replace the o2 on warranty. Pretty excited can't wait to get the car tuned again

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what would make your buddy say it's good is he a fool?

 

[curry67]

He drove it out extensively with the ford logger. Battery checks out for charge and alternator was good.

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[curry67]

It's either the o2 sensor cause the knock or I got some serious carbon buildup

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[ajpturbo]

Yeah because of the battery and alternator is a good way to check for a bad oxygen sensor LOL

 

[ajpturbo]

It's either the o2 sensor cause the knock or I got some serious carbon buildup

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neither  your oxygen sensor just decided to take a ****

 

[ajpturbo]

He drove it out extensively with the ford logger. Battery checks out for charge and alternator was good.

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Most mechanics aren't very good at reading datalogs and diagnosing problems...they are overpaid parts changers

 

[curry67]

Ya I'm just happy something is getting fixed. I'll go back and inspect the knock sensors more thoroughly. They look fine. I got the sparkplugs/boots changed. 94 octane fuel. Got rid of all the rattles in the engine bay. No leaks of any kind on engine. All I got to go on is the o2 sensor isn't reading correctly on afr bank 2 and the sensors are getting replaced. Can really only go from there.

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