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?

[Van B]

Ok so, two thoughts:

1.) set your decel valve to begin opening at 20 in-hg of vacuum.

2.) Does your 123 retain it’s advance on decel? I might be wrong here but I think the OEM dual vac pulls timing on decel

[Brian Fuerbach]

Ok so, two thoughts:

1.) set your decel valve to begin opening at 20 in-hg of vacuum.

2.) Does your 123 retain it’s advance on decel? I might be wrong here but I think the OEM dual vac pulls timing on decel

Tonight I measured the opening vacuum of the decel valve and it starts at 18 in-hg and is fully open at 20.

I also checked the wiring harness from the controller connection to the TPS (Pins #18 and #3 WOT). Idle checks out with "no connectivity", as soon as I crack the throttle I have a connection all the way to WOT. Not sure if it supposed to have continuous connectivity throughout the throttle range? The book I have says that idle uses #18 and #2 but "is no longer used". If this is not correct, let me know.

I tested the switch when it was off the throttle body not long ago and the contacts function properly but I thought there was some dead space in between idle and WOT?