three things ...
have you ever changed your pcv valve? easy to do ... should change it with the plugs. Costs about $3
next,
have you ever cleaned your throttle body? if not, go to Autozone and get Throttle Body cleaner. $3 -- clean it.
next,
check your ignition coil: at nite, is it arcing? sparking? -- also, is there white crusty crud around the coil?
do a search on this forum and/or other GMC forums on "arcing" "coil" etc ...
report back after doing this. "Catalyst Effeciency" code is probably your cat but lets see if these cheap things (TB clean, PCV) don't help first .
Quote:
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Originally Posted by Domashnia
I had a tune up last year (ish) it included plugs, wires, rotor button, distributer, dist. cap.
I havent had any fuel problems...but for 1-2 years I was having issues with the spark. Basically, I was replacing the wires, plugs, rotor button, and dist cap every 6 months. It seems to have cleared up though.
While I was having spark problems, my OBDII was reading a "multiple mis-fires" code.
I changed my fuel filter also.
I can say this though.....My fuel pump went on the fritz...so I changed it. But now the fuel guage reads normally..until 1/4 tank...then it bounces back to full..and stays there until the tank is empty.
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