L-Jet going full Rich on Deceleration Options

[Brian Fuerbach]

1974 1.8 with L- jet. Been playing with a wide band air fuel meter and noticed that when I lift the throttle the AFR goes to max value on the gauge. I thought it was supposed to go lean. I checked the throttle position switch and it checks out fine. Going to check the wiring harness next.

What else should I check? Decel valve?

[wonkipop]

i'll translate the above rambling thought.

because i have an 74 EC-B and so does Van B and Starbear, i'd be really curious to know what the AFR is after coming off the gas.

because those engines really only had to be non polluting at idle stationary.
that was the main test.
the federal emissions tests were different to the standards in california (CARB).
CARB was way stricter and became USA standard a year later.

so the idea of being rich as you come off the gas might not be out of line with the earliest version of the L jets.

i don't know for sure.

but the 74 EC-B engines were the only ones to make full use of the double can distributor.

the other three, the 74 california EC-A and the two versions in 75 don't. they leave the advance section of distributor un-used.

so maybe being a bit rich ain't all bad is what i am saying.

if it was a carb set up it wouldn't be bad necessarily.

but because you have a probe in your exhaust you almost know too much?

i only say this because i am almost sure (not 100%) that the way those original cars cleaned up hydrocarbons (unburnt fuel) was to do a late burn and also to burn it in the first sections of the hot exhaust. which would mean they would not show up at the end of the exhaust pipe where a probe might be detecting them. but they might have been still dumping fuel, just kind of crudely or bluntly dealing with it?