Balashark

My car is fairly standard. Just an aem v2 intake. Installed the aem wideband today and the results weren't what I was expecting

Between 2-3.5k it's around 12 the. Leans out to 14 till 6k. A heavy lean spike to about 15.2 and back to 14 till 8 when it starts to heavily Richen.

From what I have read this is running faaaar too lean isn't it.

waleed786

This is all during WOT right? If it was leaning out that much, you would feel a significant power drop, so its more than likely the wideband isn't reading correctly, or you are seeing those numbers at partial throttle

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noodels

Did you calibrate in atmosphere before install,was it a new wideband ?

Balashark

You don't calibrate the aem ones. Plus at cruise and idle it shows a perfect 14.7. This is at WOT

MB

What breathing mods do you have and what ECU?

Balashark

Just the aem v2 intake. Standard ecu 1999 my. Engine is from an 04. Did the injectors change? I can't figure out why it runs so lean midrange. I was thinking fuel pump. But then it goes down to 11 near redline.

Balashark

I was going to install a decat. But worried it would go even leaner.

MB

Injectors were the same afaik.

Is the AEM wideband in the cat or manifold?

Balashark

I welded a new boss in the collector just before the cat

MB

Ok, how deep is it? If it's the same depth as the oem boss then no probs, but if it's spaced too far it may read lean. I'd also check your earth as it seems odd it would read this lean with limited mods. You could also go to an mot tester and ask them to check, or better still a dyno yes they can check under load.