Quote:
Originally Posted by KaBoom1701
GM is waiting for the EPA/SMOG software update from VW first before they can go to production. 
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Quote:
Originally Posted by Number 3
In reality, it is VERY hard to launch a car for production. The I4 is likely being held back to add more focus on the top two sellers, the V6s and V8s. The I4 will follow after the major launch same as the convertible.
It just removes a level of complexity from the initial launch. It's also an indicator that GM doesn't expect the I4 to be a huge seller. And it also probably fits with the ramp up to full production.
Oh, and it is likely the least profitable of the 3 engines so no real need to hurry on that, but that's more of a guess.
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I'm sure it's a lot of moving parts to set up for the launch of a new line. But they've been doing it for 100+ years. I think they should have it from day one. Especially with all the hype for that motor.