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Old 08-10-2011, 01:40 PM   #1 (permalink)
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2000 Corolla codes 0301 0170 0301 0170
Lean code and misfire code on cylinder no.1, I've replaced the coil pack on no.1, cleaned the EGR, replaced the MAF, new air filter, new plugs(weeks ago), swapped the coil packs around to see if the misfire followed but it stayed on cylinder no.1

I'm thinking about replacing the O2 sensors, any ideas?
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Old 08-10-2011, 05:25 PM   #2 (permalink)
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It could be an intake gasket leak. Do you hear any hissing sounds near the intake manifold? Check for any loose or broken vacuum hoses. Also, watch this video for a tutorial on using carb cleaner to check:
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Old 08-10-2011, 09:22 PM   #3 (permalink)
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Swap fuel injectors 1 & 2, see if the misfire repeats on 1?
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