Dodge SRT Forum - View Single Post - AFR Lean on canned 93 Octane tune
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post #1 of (permalink) Old 07-24-2010, 04:36 PM Thread Starter
kmskovenant
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AFR Lean on canned 93 Octane tune

I want to find out whats wrong with my car. My AEM Wideband shows 11.9-12.8 AFR on stock 93 octane tune. Doing the fuel pump rewire mod didn't really drop my AFR's, maybe 0.2 at the most. Adding the fuel through DSP I managed to lower AFR's to 11.6-12.2 Or lowering the boost I also could lower my AFR to the same range. Question is why it runs so lean out of the box? Canned DSP 93oct should be at 11.7 and should not be running lean for stock SRT-4? The only mod I have on my car is HKS BOV and pink and blue lines are disconnected and capped and AEM short arm intake. Everything else stays stock. Anyways I decided not to touch boost levels and add fuel between 5-6 and 6-7k. I managed to get 11.6-12.2 AFR. Hovewer I decided to install walbro fuel pump 255 for my future upgrades, it didn't really effect on AFR after installation. Then about two days ago, out of nowhere I noticed that my AEM Wideband gauge shows 12.8-13.8 AFR's at the WOT. What can cause your AFR go so lean if all fuel mods are done and it's a STOCK car??

Can PCV valve cause bad AFRs?

Maybe HKS holds the boost when mopar used to leak and that leads to high AFRs?

O2 sensor is bad ?

Bad pump or bad stock FPR??
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