1985 Chevy Silverado failed my last two ca (test only)smog

Tiny
CAR427VETTE
  • MEMBER
  • 1985 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 137,000 MILES
2nd of 2 smog test: @ 15mph/rpm-1012, %CO2/meas-11.9, %O2/meas-0.3, HC(PPM)/max-133, gp-321, meas-285, CO(%)/max-0.89, gp-2.19, meas-4.53, NO (PPM)/max-1090, gp-2057, meas-441, results-gross polluter, @ 25mph/rpm-1290, %CO2/meas-12.2, %O2/meas-0.3, HC(PPM)/max-104, gp-271, meas-271, CO(%)/max-1.12, gp-2.42, meas-4.12, NO (PPM)/max-1030, gp-2114, meas-588, results-gross polluter, note** Before this test I had a full tank of gas, replaced w/new spark plugs(bosh fusion ir plugs), spark plug wires (8mm quality wire set), dist.-Cap(accell best quality hei type), rotor(accel best quality), PVC valve, oxygen sensor (bosh oem type), air filter(k&n) cleaned and re-oiled w/k&n recomended kit, replaced oil filter(k&n) and oil(quacker state q-series full synthetic), ** ***also note also that I drove my truck to smog station 3 miles cold and was not driven for the last month after failing my first smog test.***
My question is this: What path foward should I be taking regarding to components of my trucks smog emmision sytem should I focus on and or seek expert assistance with? Does the information above indicate an straight forward process should I follow.? Thank You kindly for any assistance your able to provide, Micahel
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Saturday, October 2nd, 2010 AT 11:58 PM

3 Replies

Tiny
RASMATAZ
  • MEMBER
Hi car427vette, Welcome to 2carpros and TY for the donation

HC/CO is too high-Check the catalytic converter and the air injection system
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Sunday, October 3rd, 2010 AT 12:16 PM
Tiny
CAR427VETTE
  • MEMBER
I/car427vette forgot to provide further information as to exactly what else I have done since the last/2nd smog check. Two days ago I have replaced the catalytic converter with the correct california legal per the manufacture, magnaflow model specific for an CA smog emmisions for an 1985 c-10 silverado 4x4 p.U. W/350 c.I. And auto trans. When installing this unit it does fit as an OE> component should. I did of course inspect the cat I had removed as it was from an suburbon and only two years old. Viewing through the cat end to end the screen drid did have some carbon sooty material but definatly was neither clogged or appeared that it was not working which I understand the only correct way to validate its functionality is by using an expensive diagnostic device that I had no access nor money to spend for this purpose. I will scrutinize the AIR pump and seemly easy system to check for obvious problems and such and I guess on Monday/tomorrow I will have the truck smog tested and hopfully pass to wait for my next regerstration. Thanks you for your direction to double check before my test tomorrow. Michael
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Sunday, October 3rd, 2010 AT 6:25 PM
Tiny
RASMATAZ
  • MEMBER
Good Luck, I'll be here if you need more assistance
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Monday, October 11th, 2010 AT 6:49 PM

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