bigmanjbmopar
Newb with a view
We have all smelled the eye watering vapor smell of a rich condition, but how does it happen and how is it fixed? or in some case's is it a no win situation?
My A/F gauge strated to act stupid recently for unknown reasons, about 2 weeks after I thought I had everything dialed in and adjusted right. Then out of the blue it just would not read unless I was over 3k rpm. Sent it off the manufacturer who happily checked it out said there was noting wrong with it but replaced the circuit board anyway just to make sure and sent it back.
Reinstalled and at the suggestion of the manf. replaced the o2 sensor with a new one to go with it. well same crap. this time I could get readings at a more reasonable cruise speed but not a consistent reading and any let off of the gas pedal produced the same no read situation.
I am stumped on this one. One thing that happened while coming in from a cruise was the motor dieseling after shut down, this told me there was something off.way off.
So I broke out the timing light, vac pump, vac gauge, etc and re went over everything, timing was at 11 initial with 18 after vac adv kicked in. I have always heard give it more timing until it ings and back off, So I kicked it up to 15° initial with 20° with vac sec kicked in and 48°-49 all in. I backed out the idle air fuel screws a 1/4 turn or so to get the vac up to 14.5-15" from 12.5-13" of where it was. vac on distr is on timed ported on the carb. (carb is qft 780 vac sec)
went for a test drive and no ping, still no read and same situation when on the gas at cruise a/f wold read on the lean side. This gauge has the ability to adjust the setpoints of low and high from the factory settings so tried that just to see which made no difference.
Side note, when I had tuned it the first time I think I still had some 101 octane gas with 108 booster in the tank, now it just has 91. would this be so significant to have to re time and re adjust the mixtures?
Is it at all possible I am so rich that the o2 sensor just won't read until I get into a lean cruise condition?
Pretty much ready to toss this a/f gauge and spend $300+ on a dual system now that I have two o2 sensors and bungs on both sides. but just pisses me off, and I also want to be able to answer the question, is too rich a condition enough to make a a/f gauge not read? and if so at what point do you have to lean it out?
My A/F gauge strated to act stupid recently for unknown reasons, about 2 weeks after I thought I had everything dialed in and adjusted right. Then out of the blue it just would not read unless I was over 3k rpm. Sent it off the manufacturer who happily checked it out said there was noting wrong with it but replaced the circuit board anyway just to make sure and sent it back.
Reinstalled and at the suggestion of the manf. replaced the o2 sensor with a new one to go with it. well same crap. this time I could get readings at a more reasonable cruise speed but not a consistent reading and any let off of the gas pedal produced the same no read situation.
I am stumped on this one. One thing that happened while coming in from a cruise was the motor dieseling after shut down, this told me there was something off.way off.
So I broke out the timing light, vac pump, vac gauge, etc and re went over everything, timing was at 11 initial with 18 after vac adv kicked in. I have always heard give it more timing until it ings and back off, So I kicked it up to 15° initial with 20° with vac sec kicked in and 48°-49 all in. I backed out the idle air fuel screws a 1/4 turn or so to get the vac up to 14.5-15" from 12.5-13" of where it was. vac on distr is on timed ported on the carb. (carb is qft 780 vac sec)
went for a test drive and no ping, still no read and same situation when on the gas at cruise a/f wold read on the lean side. This gauge has the ability to adjust the setpoints of low and high from the factory settings so tried that just to see which made no difference.
Side note, when I had tuned it the first time I think I still had some 101 octane gas with 108 booster in the tank, now it just has 91. would this be so significant to have to re time and re adjust the mixtures?
Is it at all possible I am so rich that the o2 sensor just won't read until I get into a lean cruise condition?
Pretty much ready to toss this a/f gauge and spend $300+ on a dual system now that I have two o2 sensors and bungs on both sides. but just pisses me off, and I also want to be able to answer the question, is too rich a condition enough to make a a/f gauge not read? and if so at what point do you have to lean it out?
3k cfm 2 row 1" tubes. see what happens here in hot August nights.
