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AFR during cold start?

AFR during cold start?

Postby 20SoLaRa02 » Wed Dec 14, 2011 7:22 pm

Hey guys,

Just wondering if anybody knows what their AFR is during a cold start up. Mine typically is running at around 12 then once it starts to warm up it goes to 14.7. From what i understand it has to do with the open and close loop cycles during cold starts to protect the engine ( please correct me on this).

The reason i'm asking is that I have gone through one catalytic converter already and i believe my new one just went bad again. The first catalytic converter was from the jpp header setup that had low mileage. The new one that has begun to rattle has less than 3-5k miles on it. I know my car needs a tune but i just haven't had the time and money to get it done yet, plus i wanted to get the meth kit on it first. I didn't think driving the car under easy load (attempting to keep the car in closed loop) would be an issue since my afr is normally around 14.7. Apparently, I was completely wrong and now i'm just trying to make sure that it is normal for our cars to have an afr of ~12 during a cold start at idle.

Sorry for the lousy written question, but i'm just confused and trying to learn what is going on. Any input is appreciated.

Thank you!!
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Re: AFR during cold start?

Postby 1gSE » Wed Dec 14, 2011 9:39 pm

Normal. Cold start enrichment. It starts in open loop then switches to closed loop once its warmer. My afr is about the same
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Re: AFR during cold start?

Postby Gregtrd » Wed Dec 14, 2011 9:56 pm

My Zeitronix wideband reads 14.7 to 15.2 at cold start.
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Re: AFR during cold start?

Postby Eye8Pussies » Sat Dec 17, 2011 10:21 am

mine starts off at about 11.5 or so iirc, and then it quickly goes to 14.xx (or, on mine,15.0) within about a minute or 2
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Re: AFR during cold start?

Postby 1gSE » Sat Dec 17, 2011 11:45 am

what type of gauge do you guys have? This could be a good "for future reference" type of post

I have an Innovate MTX-L
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Re: AFR during cold start?

Postby Eye8Pussies » Mon Dec 19, 2011 9:49 am

aem uego
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Re: AFR during cold start?

Postby 20SoLaRa02 » Tue Dec 20, 2011 7:12 pm

Thanks for the responses.

I'm running a innovate lm-2.

Gregtrd - did u make any adjustments to make it read ~14.7 during cold start?
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Re: AFR during cold start?

Postby Gregtrd » Tue Dec 20, 2011 9:49 pm

What piggy back are you guys running? Anyone running a split second? Esc 1?
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Re: AFR during cold start?

Postby 1gSE » Tue Dec 20, 2011 10:21 pm

AEM FIC
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Re: AFR during cold start?

Postby 20SoLaRa02 » Fri Dec 23, 2011 11:50 am

I'm running a SAFC 2 right now :(.

Any recommendations on a new catalytic converter? or should i jus use whatever the shop puts in?

Thanks again,
Michael
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Re: AFR during cold start?

Postby amabsolute » Thu Dec 29, 2011 7:26 pm

AEM afr, starts at about 10ish then goes to 12. something and after 2 to 3 minutes jumps between 14.7 to 15.2
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Re: AFR during cold start?

Postby Eye8Pussies » Mon Jan 09, 2012 9:54 pm

I'm running an esc1 along with a neo
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