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Old 11-02-2007, 12:24 PM   #120
huskerdooo
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Join Date: Jan 2007
Location: Orange, Connecticut
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Re: Codes 171 & 174 TSB # 03-16-1 update

I would think the misfire would not cause these codes. These codes are for too lean, meaning the 02 sensor sees too much air. I would think a misfire would go the other way.
There are a number of components that can contribute to a lean condition. I have a 99 and I never resolved the issue, even by performing the required bolt fix.
You should have a metal upper intake on your engine, I am not sure I would call it a plenum. Regardless, you should not have the bolt issue on your vehicle. The bolt issue is due to isolators needed to bolt the cheesy plastic intake on the metal lower portion.
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