1998 Chevy 350 motor put duals front to back what I didn't put back on were the cats an rear censor an now it backfires sometimes an is burning rich on fuel what can I do to fix this problem

Asked by GuruH9RLQ Jun 30, 2019 at 09:01 AM about the 1999 Chevrolet Silverado 1500

Question type: Car Customization

350 motor put duals front to back what I put back on were the cats an rear
censor an now it backfires sometimes an is burning rich

2 Answers
42,445

Auto_Centric answered 5 years ago

The front 02 sensors (upstream of cats) are one of the primary metering signals for fuel control. The ones rear sensors do nothing active just a monitor of the cat efficiency Not an active control.

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