Which is better for Toyota engines lean or rich - Toyota Nation Forum : Toyota Car and Truck Forums

almc2242 · 12-21-2008, 01:44 PM

Which is better for Toyota 3SFE engines, leaner or rich a/f. I've installed an Apexi AFC NEO and a AEM Gauge wide. It's working fine until this moring when a P0171 Check Engine code came up. As we know, the mixture is lean so says the code. But the AEM dispite showing that the A/F ratio is still in the green. The CE light comes up. On Monday, I'm installing the Gtech PRO RR. with a weight of 2,469 lbs. I'm going to track the reading of HP. Which is better rich or lean. N/A engine make their best HP at about 13-13.5.

Larzzzz · 12-21-2008, 04:09 PM

Rich is always better than lean. The leaner it gets, the hotter it gets. Than things start melting.......

almc2242 · 12-21-2008, 08:19 PM

The cooling systrem from my Toyota is quite adequite. It has an oil and transaxle oil cooler and a bomex front spoiler. On the contrary, a little heat might be better in my case.

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