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Aem installed.. have questions regarding AF ratios


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#21 TexasQuest

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Posted 25 September 2019 - 06:33 PM

Why are you trying to tie it into the factory o2 sensor in the first place?
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View PostJohnnyWadd, on 04 March 2010 - 10:01 PM, said:

my shaft was big i dont know what your talking about.

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#22 Rapom

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Posted 25 September 2019 - 07:10 PM

The aem has a much faster and more accurate reading. Undisputed. Oem 1 wire are very slow and not very accurate..

#23 croquest87

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Posted 25 September 2019 - 09:00 PM

Well  what's it reading at idle vs let's just say on full boost?

#24 Turbo Cary

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Posted 26 September 2019 - 12:21 PM

The shielded ground is important but not too critical as if you are splicing inside the cabin the risk of electrical noise from the ignition system is lower.

The main reason eliminating the factory O2 and using the wideband is because then you know that what the gauge is showing is what the ECU should be seeing. No guessing between is your factory o2 at this and the wideband at that. Next reason is warm up time and response rate.

Is the car running bad or are you just concerned with the AFR readings

Are you sure you spliced into the correct wire for your O2 sensor? You can use an old O2 sensor for its connector and wire that to the AEM. Your factory harness goes untouched and it makes it a plug n play type deal.

Edited by Turbo Cary, 26 September 2019 - 12:23 PM.


#25 Rapom

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Posted 26 September 2019 - 03:19 PM

See my other post about lean and power loss

So i did wire my stock 02 wire to the white aem wire

My afr would hit 17 18 ---- while cruising randomly and the engine would bog down slightly at the same time.. it would correct itself withen seconds.. or tipping into the throttle would correct it.

Before i rewired the 02 my afr's were
14-15 at idle
14 to random --- at cruise low load
10.5 under wot all gears full 11 psi

Runs great idle and wot.

After i rewired the 02 my afr's changed!

Idle is 13.8-14.5
Cruise is a STEADY 15.2-15.4 (no spikes or power loss now)
Wot is still 10.5

Im not happy with the 15.2 15.4 cruise afr.. but i think it is what it is car runs great like that.... ive ruled out pretty much everything (see other post)




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