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Lean idle until revved...?

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Old Mar 29, 2012 | 09:51 PM
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From: FoCo, CO & Chatt, TN
Lean idle until revved...?

So today I put in some RC1200's and a AMS fuel rail.
I have my injectors scaled to 1044 and my latencies set to..
3.6
2.184
2.088
1.296
.792
.720
.480

Now everything runs smooth and my AFR's are just right. The only problem I have is when I start my car it will sit around 17afr or 16afr. So I revved up the car a little bit and then the afrs bounced around a little bit around rich and then went to around 14.7. I figured maybe it just does that on a cold start or something. So I drove to work, checked my schedule, and came back (within 2 mins.. so the car is still hot). Started the car and it sat around 16 again. For ****s and giggles I revved it up a little bit right away and then it corrected itself and went back down to 14.7. I again let it sit for a minute. Turned it back on and it just sat around 17.... Revved it to about 2200rpms for a second and let off and it corrects itself again.. Whats going on here?

I did a scan before and after a rev and here are my differences.
Before (when running lean):
RPMs sit between 1000 and 1031.25
Injector pulse width 1.536
Injector duty cycle 1.28-1.32

After
RPMs 906.25-937.25
Injector pulse width 1.28
Injector duty cycle .96666-1

Timing is about the same but like I said the afrs are about a whole 1-2 leaner

Any input to fix this would be much appreciated. Thanks
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