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]

The fouling is something to think about though. I have had many carbed cars over the years and decel fouling wasn't an issue. I think I have seen hints of it in my car but nothing terrible. When it warms up I might experiment with that. I can't imagine that was ignored by the manufacturer. Perhaps that is something we can tune away to some extent.

[wonkipop]

The fowling is something to think about though. I have had many carbed cats over the years and decel fowling wasn't an issue. I think I have seen hints of it in my car but nothing terrible. When it warms up I might experiment with that. I can't imagine that was ignored by the manufacturer. Perhaps that is something we can tune away to some extent.

know what you are saying.

i am curious about mine.

i don't have a probe in the exhaust to drive around and find out.
probably just as well.
but i guess when i get it in the workshop i can get an analyser on it and do some stationary tests watching what it does on the way down from closing the throttle from higher revs?

[emerygt350]

The fowling is something to think about though. I have had many carbed cats over the years and decel fowling wasn't an issue. I think I have seen hints of it in my car but nothing terrible. When it warms up I might experiment with that. I can't imagine that was ignored by the manufacturer. Perhaps that is something we can tune away to some extent.

know what you are saying.

i am curious about mine.

i don't have a probe in the exhaust to drive around and find out.
probably just as well.
but i guess when i get it in the workshop i can get an analyser on it and do some stationary tests watching what it does on the way down from closing the throttle from higher revs?

Man, trying to imagine my engine packed up with chickens. Don't post pre-coffee.

Anyway, fixed that.

I am going to try two things, one of which you could do if you have some hills around. I am getting a new probe (I think my 50 year old engine burns enough oil to do terrible things to o2 probes), and will look at both the numbers on the gauge but also plug condition. I have a hill that I know results in some fouling (not fowling, man that is something to imagine), and there is a parking lot at the bottom. I am going to let the engine drag down the hill (10% grade, maybe 500 feet decent, 1/2 mile) and then check the plug condition.

I found a 36 dollar wide band that should work with my autometer gauge, it will be interesting to see how it stands up to the original.
Dan

[wonkipop]

The fowling is something to think about though. I have had many carbed cats over the years and decel fowling wasn't an issue. I think I have seen hints of it in my car but nothing terrible. When it warms up I might experiment with that. I can't imagine that was ignored by the manufacturer. Perhaps that is something we can tune away to some extent.

know what you are saying.

i am curious about mine.

i don't have a probe in the exhaust to drive around and find out.
probably just as well.
but i guess when i get it in the workshop i can get an analyser on it and do some stationary tests watching what it does on the way down from closing the throttle from higher revs?

Man, trying to imagine my engine packed up with chickens. Don't post pre-coffee.

Anyway, fixed that.

I am going to try two things, one of which you could do if you have some hills around. I am getting a new probe (I think my 50 year old engine burns enough oil to do terrible things to o2 probes), and will look at both the numbers on the gauge but also plug condition. I have a hill that I know results in some fouling (not fowling, man that is something to imagine), and there is a parking lot at the bottom. I am going to let the engine drag down the hill (10% grade, maybe 500 feet decent, 1/2 mile) and then check the plug condition.

I found a 36 dollar wide band that should work with my autometer gauge, it will be interesting to see how it stands up to the original.
Dan

whats the conversion rate from horsepower to chookpower?

[Brian Fuerbach]

The fowling is something to think about though. I have had many carbed cats over the years and decel fowling wasn't an issue. I think I have seen hints of it in my car but nothing terrible. When it warms up I might experiment with that. I can't imagine that was ignored by the manufacturer. Perhaps that is something we can tune away to some extent.

know what you are saying.

i am curious about mine.

i don't have a probe in the exhaust to drive around and find out.
probably just as well.
but i guess when i get it in the workshop i can get an analyser on it and do some stationary tests watching what it does on the way down from closing the throttle from higher revs?

Man, trying to imagine my engine packed up with chickens. Don't post pre-coffee.

Anyway, fixed that.

I am going to try two things, one of which you could do if you have some hills around. I am getting a new probe (I think my 50 year old engine burns enough oil to do terrible things to o2 probes), and will look at both the numbers on the gauge but also plug condition. I have a hill that I know results in some fouling (not fowling, man that is something to imagine), and there is a parking lot at the bottom. I am going to let the engine drag down the hill (10% grade, maybe 500 feet decent, 1/2 mile) and then check the plug condition.

I found a 36 dollar wide band that should work with my autometer gauge, it will be interesting to see how it stands up to the original.
Dan

whats the conversion rate from horsepower to chookpower?

Chookpower you say?

[emerygt350]

The fowling is something to think about though. I have had many carbed cats over the years and decel fowling wasn't an issue. I think I have seen hints of it in my car but nothing terrible. When it warms up I might experiment with that. I can't imagine that was ignored by the manufacturer. Perhaps that is something we can tune away to some extent.

know what you are saying.

i am curious about mine.

i don't have a probe in the exhaust to drive around and find out.
probably just as well.
but i guess when i get it in the workshop i can get an analyser on it and do some stationary tests watching what it does on the way down from closing the throttle from higher revs?

Man, trying to imagine my engine packed up with chickens. Don't post pre-coffee.

Anyway, fixed that.

I am going to try two things, one of which you could do if you have some hills around. I am getting a new probe (I think my 50 year old engine burns enough oil to do terrible things to o2 probes), and will look at both the numbers on the gauge but also plug condition. I have a hill that I know results in some fouling (not fowling, man that is something to imagine), and there is a parking lot at the bottom. I am going to let the engine drag down the hill (10% grade, maybe 500 feet decent, 1/2 mile) and then check the plug condition.

I found a 36 dollar wide band that should work with my autometer gauge, it will be interesting to see how it stands up to the original.
Dan

whats the conversion rate from horsepower to chookpower?

Chookpower you say?

Perhaps it's a southern hemisphere thing...