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Old 01-04-2018, 08:41 PM   #1
Apache'71
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Join Date: Jul 2006
Location: Clayton, CA
Posts: 37
MSD Atomic EFI on '79 K30 in Cali

HELP PLEASE... Just bought (and maybe need to return) a complete MSD Atomic EFI kit with the return system, new '87 tank and sending unit to install in my '79 K30 that resides in California and currently passes smog.

After opening the MSD box and reading the Addendum for the first time, noticed that it says the Atomic will NOT work if you have Air Injection into the Exhaust system. Which my truck does.

After calling MSD and confirming twice with two different people that the system will indeed NOT work with my truck I am pissed that all indications were that this system is complianT for CARB for '87 and older GM vehicles to maintain smog/CARB compliances. It's also my understanding that many (maybe nearly all but certainly that would be an incorrect statement) had air injections system unless it was TBI which I believe was only the latest models. Wouldn't that essentially mean that the Atomic, even-though it's CARB certified, won't really work for nearly any application since most had air Injection?

I really want to make this work despite MSD misleading me up until reading the Addendum, so what are my options?

Here's how I see it:
1. Return everything and carry on life with the carburetor
2. Install it and confirm it doesn't work cause the O2 sensor will be reading lean and dump more fuel maybe the truck run terrible and waste fuel
3. Try to disable the Air Injection System (or some portion) so it looks correct and passes visual inspection but doesn't actually pump air into the exhaust manifolds. But then will it not pass particulate readings...maybe, maybe not...?
3a. Block off one exhaust manifold side by deliberately clogging the air supply tube, install the O2 sensor downstream of this manifold to provide correct O2 readings, and maintain air injection in the other manifold to provide some benefit for reducing the emission to hopefully pass both visual inspection and particulate readings

Any other thoughts or suggestions?
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'79 Chevy K30 LB
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