emissions failure

[golfballs]

I own a 2000 GMC G2500 Savana cargo van and have been trying to deal with a lot of issues and hope someone here can help me.Every time i accelerate there is a banging noise that seems to be comming from the exhaust or something else under the floor on the drivers side. i get about 7 or 8 miles to the gallon, and i have failed the emissions test. the banging is only when i accelerate from a dead stop, after 2 seconds the banging or knocking is gone and the engine runs beautiful. Also i have a small amount of spark knock. when i took it for emissions i had a 2700 hydrocarbons level when 300 is max i can have to pass. I have 4 codes listed 171 and 174 or its 171 and 173 but i think its the 171 and 174. When i checked the meaning of the codes it stated the engine is running to rich. I have 2 codes for both numbers - 171 bank 1 and 2 174 bank 1 and 2 to rich. I changed the plugs, wires cap and rotor . i have to the 31st of December or the state of illinois will suspend my plates for this matter not being solved. I dont know if this matters but it appears the one of my converters are empty, someone banged on the with a hammer and said one sounded like a empty tincan and the other sounded like it was fine and my muffler has debris in it. I Was also told to look for a vacum line that might be disconected and found none. I want to thank you all in advance for any knowledge that you might have for me.

 

Thank you

Jim

Chicago

[yeehaw87]

The knocking your getting is probably from the catalyst in the cat being broken. If you take it in they will tell you that you need a new one. That would be the cause of you failing an emissions test. as far as the bad mpg, it could be that your front O2 sensors are bad, which I have heard of before.

I own a 2000 GMC G2500 Savana cargo van and have been trying to deal with a lot of issues and hope someone here can help me.Every time i accelerate there is a banging noise that seems to be comming from the exhaust or something else under the floor on the drivers side. i get about 7 or 8 miles to the gallon, and i have failed the emissions test.

Thank you

Jim

Chicago

 

<{POST_SNAPBACK}>

 

 

[golfballs]

I own a 2000 GMC G2500 Savana cargo van and have been trying to deal with a lot of issues and hope someone here can help me.Every time i accelerate there is a banging noise that seems to be comming from the exhaust or something else under the floor on the drivers side. i get about 7 or 8 miles to the gallon, and i have failed the emissions test. the banging is only when i accelerate from a dead stop, after 2 seconds the banging or knocking is gone and the engine runs beautiful. Also i have a small amount of spark knock. when i took it for emissions i had a 2700 hydrocarbons level when 300 is max i can have to pass. I have 4 codes listed 171 and 174 or its 171 and 173 but i think its the 171 and 174. When i checked the meaning of the codes it stated the engine is running to rich. I have 2 codes for both numbers - 171 bank 1 and 2 174 bank 1 and 2 to rich. I changed the plugs, wires cap and rotor . i have to the 31st of December or the state of illinois will suspend my plates for this matter not being solved. I dont know if this matters but it appears the one of my converters are empty, someone banged on the with a hammer and said one sounded like a empty tincan and the other sounded like it was fine and my muffler has debris in it. I Was also told to look for a vacum line that might be disconected and found none. I want to thank you all in advance for any knowledge that you might have for me.

 

Thank you

Jim

Chicago

 

<{POST_SNAPBACK}>

 

 

 

yeehaw

 

thank you very much for your time and knowledge.

 

jim

chicago