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Replaced my catalyc converter, was discolerd inside. They said I was burning too much raw fuel.

Tiny
JOHN912
  • MEMBER
  • 2001 CHEVROLET MALIBU
  • 3.1L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 140 MILES
Burning too much raw fuel, keep having catylic failure. I replaced the following; map sensor, egr valve, catylic convertor, coil packs, plugs, wires, fuel filter, fuel pressure regulator, temp sensor, both the up and downstream oyx sensors. Still having same problem. Please help me, thank you.
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Wednesday, February 25th, 2015 AT 9:43 AM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Scan for codes and check fuel pressure with a gauge auto parts rent it
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Wednesday, February 25th, 2015 AT 9:50 AM
Tiny
JOHN912
  • MEMBER
  • 2 POSTS
I will rent tool to check fuel pressure, my code is po420 catylist system below threshold. Bank 1.
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Thursday, February 26th, 2015 AT 10:34 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
That is the converter on lh bank also check for an air leak as it will setthe same code. If you replaced that converter and didn't weld it on that may be the problem. Also check for an air leak leading to throttle body.
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Thursday, February 26th, 2015 AT 12:02 PM

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