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?

[emerygt350]

It would be interesting to know what the dizzy connection is since in this case we have a 123 rather than the original.

[wonkipop]

It would be interesting to know what the dizzy connection is since in this case we have a 123 rather than the original.

yes.


anyway

Van is right. it is retarding with the original dist so thats doing a later burn and getting rid of hydrocarbons that might be sensed by the probe that OP has.

and

its doing a little fuel thing as well via the ECU where its getting some info also from the original style distributor.

but i mean a carbie car just does the rich thing on throttle lift off.
so ........its no worse than that?
or am i missing something.

i know here all the old school mechanics hated that lean thing that emissions cars did on throttle lift. thought it was worse for cars than the rich dump from carbies.
swings and roundabouts?

worst it can do is pop and bang through the exhaust when you come off the gas?
not exactly a backfire, more a detonation in the exhaust system.
bad for catylisers sure. but all this stuff was designed for preserving cats and cleaning up exhaust at the dirty times. idle and the big one, coming off the gas.