 L-Jet going full Rich on Deceleration |
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| Brian Fuerbach |
 Mar 27 2022, 06:36 PM
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#1
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Member  Group: Members Posts: 119 Joined: 1-July 19 From: Orange, Ca Member No.: 23,266 Region Association: Southern California  |
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? |
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Replies
| Brian Fuerbach |
Mar 28 2022, 01:43 PM
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#2
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Member Group: Members Posts: 119 Joined: 1-July 19 From: Orange, Ca Member No.: 23,266 Region Association: Southern California |
Regardless of the vac adv or retard, the centrifugal advance in a stock distributor will keep the advance at 27 degrees. Not sure pulling out 5 degrees timing would change the afr that much.
I will check my decel valve opening values tonight. I am running a 2.0 Bursch exhaust. The 02 sensor is located about 10" downstream from the collector. |
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| Van B |
Mar 28 2022, 05:16 PM
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#3
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Senior Member Group: Members Posts: 1,621 Joined: 20-October 21 From: WR, GA Member No.: 26,011 Region Association: None 
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QUOTE(Brian Fuerbach @ Mar 28 2022, 03:43 PM)  Regardless of the vac adv or retard, the centrifugal advance in a stock distributor will keep the advance at 27 degrees. Not sure pulling out 5 degrees timing would change the afr that much. I will check my decel valve opening values tonight. I am running a 2.0 Bursch exhaust. The 02 sensor is located about 10" downstream from the collector. You might want to check this chart, we’re not talking about just 5 degrees 74 model would be using 205 AA Attached thumbnail(s) 
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Posts in this topic
Brian Fuerbach L-Jet going full Rich on Deceleration Mar 27 2022, 06:36 PM
emerygt350 My mustang goes super lean on throttle lift, as it... Mar 27 2022, 06:44 PM Van B I haven’t measured my AFR to compare so, I canâ€... Mar 27 2022, 07:19 PM
Brian Fuerbach
I haven’t measured my AFR to compare so, I canâ... Mar 27 2022, 09:50 PM Van B Ok so, two thoughts:
1.) set your decel valve to ... Mar 27 2022, 10:04 PM Brian Fuerbach
Ok so, two thoughts:
1.) set your decel valve to... Mar 27 2022, 10:45 PM Brian Fuerbach
Ok so, two thoughts:
1.) set your decel valve to... Mar 28 2022, 10:34 PM Van B Ok, I’m too tired to think straight but yes, you... Mar 28 2022, 12:29 AM wonkipop
Ok, I’m too tired to think straight but yes, yo... Mar 28 2022, 01:34 AM emerygt350 But here he is running a 123 right? so you have to... Mar 28 2022, 08:43 AM Van B Definitely possible.
As you've seen through my... Mar 28 2022, 09:13 AM Van B
Definitely possible.
As you've seen through m... Mar 28 2022, 09:17 AM emerygt350
Definitely possible.
As you've seen through ... Mar 28 2022, 09:24 AM Van B AFM is literally the barn door. it attaches to the... Mar 28 2022, 09:36 AM emerygt350
AFM is literally the barn door. it attaches to th... Mar 28 2022, 10:38 AM Van B
AFM is literally the barn door. it attaches to t... Mar 28 2022, 10:43 AM wonkipop
AFM is literally the barn door. it attaches to th... Mar 28 2022, 03:00 PM ClayPerrine The AFM in an L-Jet system will push fuel into the... Mar 28 2022, 09:48 AM emerygt350 So a decel hooked to the boot would be unmeasured ... Mar 28 2022, 10:37 AM Van B
So a decel hooked to the boot would be unmeasured... Mar 28 2022, 10:42 AM wonkipop
So a decel hooked to the boot would be unmeasured... Mar 28 2022, 03:41 PM emerygt350 Is this correct?
I know they changed stuff every... Mar 28 2022, 10:44 AM emerygt350 If it is, man that doesn't make much sense to ... Mar 28 2022, 10:47 AM Van B
If it is, man that doesn't make much sense to... Mar 28 2022, 10:56 AM emerygt350 Too much advance could certainly do it, but there ... Mar 28 2022, 11:02 AM Van B the little subset square on the airbox is meant to... Mar 28 2022, 10:45 AM emerygt350 Yeah,we were only speculating on 'way too much... Mar 28 2022, 02:04 PM r_towle My experience with this is two things.
1) a dirty ... Mar 28 2022, 03:06 PM emerygt350 But wonkipop, that completely ignores the ecus res... Mar 28 2022, 03:52 PM wonkipop
But wonkipop, that completely ignores the ecus re... Mar 28 2022, 03:56 PM emerygt350 I would bet it does, otherwise they would have jus... Mar 28 2022, 04:20 PM wonkipop
I would bet it does, otherwise they would have ju... Mar 28 2022, 04:59 PM emerygt350 It would be interesting to know what the dizzy con... Mar 28 2022, 05:09 PM wonkipop
It would be interesting to know what the dizzy co... Mar 28 2022, 05:53 PM wonkipop ps
i was trying to look for info on the fpr in th... Mar 28 2022, 06:40 PM wonkipop @Emerygt350 .
always have to go back and re-read ... Mar 28 2022, 08:11 PM Van B Your vac readings are what my decel valve yielded ... Mar 28 2022, 10:55 PM wonkipop
Your vac readings are what my decel valve yielded... Mar 29 2022, 12:51 AM wonkipop i'll translate the above rambling thought.
be... Mar 29 2022, 01:08 AM wonkipop i did a bit more reading.
because i was intereste... Mar 29 2022, 07:25 AM emerygt350 That makes good sense. Mar 29 2022, 08:59 AM Brian Fuerbach Appreciate all the replys. Took me a bit to read t... Mar 29 2022, 02:37 PM wonkipop
Appreciate all the replys. Took me a bit to read ... Mar 29 2022, 03:02 PM Brian Fuerbach
Appreciate all the replys. Took me a bit to read... Mar 29 2022, 04:10 PM wonkipop try measuring the Air Fuel Mix at idle too to comp... Mar 29 2022, 04:45 PM wonkipop @Brian Fuerbach
that description above about L je... Mar 29 2022, 05:04 PM Brian Fuerbach
[b]@[url=http://www.914world.com/bbs2/index.php?s... Mar 29 2022, 07:36 PM wonkipop that is correct brian
Mar 29 2022, 08:26 PM wonkipop i am doing some more reading on just how the L jet... Mar 29 2022, 08:38 PM Brian Fuerbach
by looking for info on your afr condition i now... Mar 30 2022, 09:36 AM wonkipop
by looking for info on your afr condition i no... Mar 30 2022, 04:09 PM Brian Fuerbach
[quote name='Brian Fuerbach' post='2991765' date=... Mar 30 2022, 05:20 PM emerygt350 The fouling is something to think about though. I... Mar 30 2022, 05:03 AM wonkipop
The fowling is something to think about though. ... Mar 30 2022, 06:39 AM emerygt350
The fowling is something to think about though. ... Mar 30 2022, 06:47 AM wonkipop
[quote name='wonkipop' post='2991722' date='Mar 3... Mar 30 2022, 04:16 PM Brian Fuerbach
[quote name='wonkipop' post='2991722' date='Mar ... Mar 30 2022, 05:10 PM emerygt350
[quote name='wonkipop' post='2991854' date='Mar 3... Mar 30 2022, 05:30 PM emerygt350 Let's just blame autocorrect on all of that...... Mar 30 2022, 05:26 PM wonkipop
Let's just blame autocorrect on all of that..... Mar 30 2022, 05:59 PM wonkipop chookyard = chickenyard.
think the limeys call th... Mar 30 2022, 05:39 PM Van B
chookyard = chickenyard.
think the limeys call t... Mar 30 2022, 08:26 PM wonkipop
chookyard = chickenyard.
think the limeys call ... Mar 30 2022, 09:38 PM wonkipop here is another note on that decel thing.
the ide... Mar 30 2022, 06:16 PM emerygt350 I bet Mr. Injector could tell us exactly how they ... Mar 30 2022, 06:17 PM wonkipop
I bet Mr. Injector could tell us exactly how they... Mar 30 2022, 06:34 PM Brian Fuerbach I checked the fuel press reg and all is golden. :... Mar 30 2022, 08:40 PM wonkipop
I checked the fuel press reg and all is golden. ... Mar 30 2022, 09:06 PM Brian Fuerbach
I checked the fuel press reg and all is golden. ... Mar 31 2022, 02:02 PM wonkipop
[quote name='wonkipop' post='2991943' date='Mar 3... Mar 31 2022, 03:30 PM wonkipop [b]@[url=http://www.914world.com/bbs2/index.php?s... Mar 31 2022, 04:30 PM emerygt350 Does that line head into the plenum or the air box... Mar 31 2022, 05:41 PM Brian Fuerbach Wonkipop,
I did read the thread on on the cap. I ... Mar 31 2022, 08:08 PM wonkipop
Wonkipop,
I did read the thread on on the cap. I... Mar 31 2022, 09:23 PM emerygt350 interesting. I assume that PCV system is like the... Apr 1 2022, 06:42 AM Brian Fuerbach
interesting. I assume that PCV system is like th... Apr 1 2022, 01:26 PM wonkipop
interesting. I assume that PCV system is like th... Apr 1 2022, 04:33 PM Brian Fuerbach
interesting. I assume that PCV system is like t... Apr 1 2022, 05:17 PM wonkipop
[quote name='wonkipop' post='2992472' date='Apr 1... Apr 1 2022, 06:11 PM emerygt350 No, no fuel cut on the djet, but I found the rich ... Apr 1 2022, 06:15 PM wonkipop
No, no fuel cut on the djet, but I found the rich... Apr 1 2022, 06:21 PM wonkipop
No, no fuel cut on the djet, but I found the rich... Apr 1 2022, 06:42 PM Van B You guys just aren’t willing to talk about spark... Apr 1 2022, 06:39 PM wonkipop
You guys just aren’t willing to talk about spar... Apr 1 2022, 06:47 PM Brian Fuerbach
You guys just aren’t willing to talk about spa... Apr 1 2022, 07:25 PM wonkipop
[quote name='wonkipop' post='2992522' date='Apr 1... Apr 1 2022, 07:38 PM Van B Distributor vacuum is read/pulled from the throttl... Apr 1 2022, 07:05 PM wonkipop
Distributor vacuum is read/pulled from the thrott... Apr 1 2022, 07:24 PM Van B
Distributor vacuum is read/pulled from the throt... Apr 1 2022, 07:32 PM wonkipop
[quote name='wonkipop' post='2992530' date='Apr 1... Apr 1 2022, 07:44 PM Van B
ok.
so i have the distributor bit right.
phew... Apr 1 2022, 07:44 PM wonkipop
ok.
so i have the distributor bit right.
phew... Apr 1 2022, 07:47 PM Van B Right now I have a relay board baking in the oven ... Apr 1 2022, 07:07 PM wonkipop
Right now I have a relay board baking in the oven... Apr 1 2022, 07:51 PM wonkipop that chart was great.
just as a translation device... Apr 1 2022, 08:16 PM Brian Fuerbach
that chart was great.
just as a translation devic... Apr 2 2022, 02:42 PM Van B Yes. AFR is the bottom scale. There are various g... Apr 2 2022, 03:45 PM wonkipop @Brian Fuerbach
although that specific chart has... Apr 2 2022, 06:19 PM |
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