CEL: Lean at idle - Miata Turbo Forum - Boost cars, acquire cats.

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Old 05-14-2007, 03:31 PM   #1
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Default CEL: Lean at idle

I'm getting a CEL today -- the code is for "too lean at idle" although the car runs fine. Stopped by my mechanic, he cleared it, it came back soon after.

I had never had this code before. Yesterday I upgraded from my stock injectors (265 on an MSM) to newly cleaned and tested 305 injectors from an early 90s Supra. But then I drove a few hours yesterday, all was well, until getting the CEL this morning.

What should I do? I know the 305s are fine because I have a report from the cleaning service. And I don't think we mis-installed them because the car runs well.
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Old 05-14-2007, 03:40 PM   #2
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You can get that CEL from a bad O2 sensor, or a broken connection to the O2 sensor, or the FM O2 signal modulator switch going bad, or the O2 sensor not screwed all the way into the pipe. You need to check over the work you have done in the past 2 weeks.

Also, get your AFR checked now that you have the new injectors installed to make sure that they have richened sufficiently the mix under your maximum boost pressure.
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