Mechanics

SERVICE ENGINE SOON

1997 GMC Sonoma • 4.3L 6 cylinder 2WD Automatic • 148,000 miles

I put a diagnostic computer to my truck. It says rich in bank 1. My truck sometimes stalls. But starts right back up. If im sittn at a stop in gear. It spuders when I give it gas.
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Marty714mcfly
March 7, 2014.




Running rich means either the vehicle is dumping fuel, or not burning the fuel that's in the cylinder, or the catalytic converter isn't burning off the excess. Id start with checking/changing the plugs and wires. Then check for a fuel injector sticking open, then check the "in" temp against the "out" temps on the bank two catalytic converter. It should be much hotter on the "out" side



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