When throwing parts at it goes wrong!

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When all else fails, throw a dud junkyard motor in it!
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I feel bad for the guy in the vid who owns the car.
 
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It's gotten to the point that any competent mechanic should have and know how to use a lab scope. If not they're most likely just a parts changer.
 
ScannerDanner on YouTube has posted several videos of cars that have had engine swaps, PCM swaps, or both when the real issue turned out to be an electrical problem (usually a bad ground somewhere, but sometimes something stranger such as a bad sensor causing the PCM to appear faulty). Code readers are nice, but too many people swap parts based on a code.

In this particular case, it is hard to determine what happened and who was at fault. Someone told the owner the card needed a head gasket, which might have been based on a guess or an actual diagnostic. The owner must have found what he though was a better deal on a used engine, and whoever swapped it didn't check the compression on the new engine. Then some more parts were swapped.
 
this is too common.owner trying to save money taking it to multiple hack jobs.
they throw parts till the owner is bankrupt.and now its worse than when they started.
better than half of the pcm's sent to me for repair are ok.quite a few gm clusters test fine on the bench after i rebuild them yet wont work in the truck.
bad grounds account for most of these issues.
worst one i saw is a 2005 ford 6.0 dually a friend bought for $900.
has a diagnosis of worn out engine.
ficm main at 30v!
i rebuilt the ficm and it now runs perfect.what a score for $900!
 
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