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Secondary air injection

Tiny
LMM66
  • MEMBER
  • GMC SONOMA
I have a 2000 gmc sonoma 4x4 4.3 v6. The check engine light came on. I read the codes saying - secondary air injection malf and cyl #2 misfire detected. I replaced the plugs and wires, and the light went away for about 500 mi and then came back with the same problem. What is secondary air? Are these 2 problems related? The truck is getting very poor gas mileage.
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Friday, August 17th, 2007 AT 2:55 AM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
P0410 secondary air injection malf

what is secondary air- it is from the air pump to help oxidizes the exhaust gases so that the catalytic converter operates efficiently.

P0302 No.2 misfire could come from a weak coil/lean mixture/dirty injectors/vacuum leaks/burn exhaust valve/bad gas/low fuel pressure/Open EGR
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Friday, August 17th, 2007 AT 4:15 AM

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