Actually Crunch, only certain 1980 California
vehicles had CCC, 1981 was the first full model year for CCC on virtually all GM vehicles.
As for that '79 Pontiac Phoenix, let me guess... the 151 inline 4 VIN 1 motor, right? That was EFC (Electronic Fuel Control) and was the first of GM feedback carburetors, using a Holley 6510-C. It first appeared on 1978 California vehicles, and then 1979. I believe it was only used on this engine. And yes, no diagnostics - just like with EFI systems before them - those were real hair pullers.
Then came the C-4 (Computer Controlled Catalytic Converter) system in 1979 (to 1980) which was more friendly than EFC. Many of the C-4 and CCC codes were identical (CCC was expanded). C-4 was used on a variety of vehicles, the 151, 173, 231, 260, 350, and maybe others.
The 1980 Olds Cutlass with the 260 V-8, ironically, had a "hybrid" C-4 AND
CCC system mix.
And let's not forget the 1978-1979 Olds Toronado Electronic Spark Timing system on the 403 V-8... this thing had a coolant sensor, vacuum and barometric sensors (and how many of these systems had the barometric line incorrectly connected to vacuum and vice versa?) Ever deal with the dreaded "CHECK IGNITION" light on those things? Setting the timing was a riot... grounding the purple reference connector at the module under the glove box and adjusting the crank sensor underneath the damn PS pump. And it was too easy to send the expensive crank sensor into the crank disc - way too adjustable. No start conditions on these vehicles were always fun.
Also just a quick side note on the V-8-6-4 Caddy 368 (6.0) motor, that was 1981 also, but DFI actually came out in 1980, virtually same 368 engine except without the modulated displacement.
JoeIf you found this information helpful, please support BATAuto!