Question about GMC Sierra 2500
Tune up for gas is different in the timing compared to lead or unleaded fuel by upto 12 degrees
the two computers control the engine management & the transmission
when you switch between nat gas & fuel a solenoide is activated to block ether so they cant mix
if they did mix your gas would freeze the fuel & you would see the fuel pipes start to get iced up
Posted on Jul 29, 2009
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Posted on Jan 02, 2017
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