Question about GMC Safari

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2000 GMC Safari van v6 180,000 miles. 2 years running po420 code comes up and reset with a code reader. Works good for that. Slight miss at 60mph plus loaded and pulling, so I drive at 58mph. Then the other day as I approched an intersection I noticed a shudder and a shake (ruff running of the motor) and nearly stalled at the intersection. As I continued the next 6 miles or so home it ran good at higher RPM but rough at slower speeds and idleing. So I got it in the driveway checked the codes, po101, po300, po420, then shut it down. Well to my suprise it will not start again.......any suggestions? Can a MAF sensor keep it from starting? Smells like it is getting fuel. Had a 76 T-Bird act the same way, it was the crank position sensor on that problem.

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P0101 is the MAF sensor and if it has even a tiny amountof crud on it, it can keep the dar from running. clean with ELECTRONICS cleaner not carb/brake spray.

P0300 is multiple misfire detected. Sound like it might need tune-up parts

P0420 is the catalyst system bank 1 low efficiency.

I would start with changing the plugs, wires, cap and rotor. And clean the MAF sensor with the proper cleaner. Then see if the car starts and idles. If it does then clear the codes. If it doesn't run right then I would suspect the MAF sensor is kaput. The P0420 code can be caused by a poorly running engine.

Posted on Dec 31, 2010

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