Quote:
Originally Posted by Baz
My 2002 Silverado 4.8 (241K miles) wouldn't start last Friday, after I stopped for an errand.
I have to admit.....the engine had been exhibiting some sputtering on and off for the couple previous weeks.
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A distributor cap vs. coil-over-plug makes a big difference.
If one c-o-p goes bad, it should still start or run a little worse.
Something that affects the entire system, you got to start swimming upstream to the source.
Narrow it down:
-A clogged cat/muffler will at least start and run for a few seconds or minutes.
-Does the tailpipe smell like gas? Then it's probably spark.
-Air filter okay? Might still be a TPS or MAF/MAP sensor which tricks the ECU into not giving gas.
I have no idea how a GM Security lockout works(spark or fuel) or what triggers it.
Might even call a more distant dealership or search internet forums.
If the key has an RFID but the corresponding ignition sensor goes bad, that might do it.