Need help with emissions problem on a 1987 silverado 5.7 tbi
#1
Need help with emissions problem on a 1987 silverado 5.7 tbi
Hello my truck recently failed the low speed test on both co and hc.
I have replaced the cap,rotor,plugs,wires,and air filter and it is still failing.
Any ideas where to go next?
I have replaced the cap,rotor,plugs,wires,and air filter and it is still failing.
Any ideas where to go next?
#4
The timing is advanced 2 degrees, and the guy at the emissions said it would be failing a different test if it was the cats or exhaust. I checked the three vacuume lines at the throttle body and they seem fine.
I did notice today the there are only 2 lines plugged into the canister, does anyone know where to find a diagram that shows where all the lines from the charcoal canister should run to?
I did notice today the there are only 2 lines plugged into the canister, does anyone know where to find a diagram that shows where all the lines from the charcoal canister should run to?
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