battery ?
 

has anyone ever heard of a battery having a dead cell and then turning on
the defense mechanism of the computer so your car won't start? my stepson's
Hyundai accent wouldn't start and i got 12 volts at the battery and at the
wiring harness to the coils. the coils and crankshaft position sensor were
new. the dealer charged him $118.00 for the battery and now it runs ,where
before we got no spark, even if i jumped it with a portable power pack. any
thoughts? thanks