Jeep - AMC 4.0L and 4.2L Stroker Enthusiasts
https://www.jeepstrokers.com/forum/
I even ran it at stock and it was all over the place. I unpluged the map sensor while running though and that settled it down substantially it hovered around 14.4-14.9 pretty closelySilverXJ wrote:If make some time to lean it out, or you are pushing it out of range and the PCM is fighting it.
It is like it isnt even using closed loop it just goes right to open, even before it is up to operating temperatures.SilverXJ wrote:If make some time to lean it out, or you are pushing it out of range and the PCM is fighting it.
Not sure. Do you know where to find a cheap tester? And how do you test the vacuum?SilverXJ wrote:Whats your vacuum at idle?
I think you've cranked the MAP voltage up too far. The AFR should fluctuate in a narrow range around 14.7 when the engine's at hot idle or when cruising. Yours is fluctuating more wildly which suggests that the PCM is working hard to lean out a mixture that you've set too rich to keep it around 14.7, so I suggest you return the MAP voltage back to 5.35v and work from there.showtime3492 wrote:Initial start up yielded Airfuel ratio bouncing around between 14.3-15.8 that was on a map adjusted voltage of 5.35v
Cranked map voltage up to 6.20v and it held around 13.6-15.2
bouncing around fairly erraticly.
Have vids of the guage ill post.
My intitial questions are.
1. i thought that the map adjusted voltage did not kick in untill at above 80% throttle?
2. What is going on here seems kinda crazy
3. How screwed is it? lol
Thats what i thought so i left it at the factory 5.0 voltage and it still did the same thing. The first time i unplugged the map however it ran better, sequential times after wards though it wanted to go lean. it did this at every voltage i set it at from factory -6.2Cheromaniac wrote:I think you've cranked the MAP voltage up too far. The AFR should fluctuate in a narrow range around 14.7 when the engine's at hot idle or when cruising. Yours is fluctuating more wildly which suggests that the PCM is working hard to lean out a mixture that you've set too rich to keep it around 14.7, so I suggest you return the MAP voltage back to 5.35v and work from there.showtime3492 wrote:Initial start up yielded Airfuel ratio bouncing around between 14.3-15.8 that was on a map adjusted voltage of 5.35v
Cranked map voltage up to 6.20v and it held around 13.6-15.2
bouncing around fairly erraticly.
Have vids of the guage ill post.
My intitial questions are.
1. i thought that the map adjusted voltage did not kick in untill at above 80% throttle?
2. What is going on here seems kinda crazy
3. How screwed is it? lol
The PCM will only go into rich open-loop mode during warm-up and heavy acceleration. At WOT you should be aiming for ~13.0 over as wide an rpm range as possible.
It was higher than i thought it would be it was 5.13 at the factory setting before map adjuster.CobraMarty wrote:What is your MAP output voltage with the key on engine off?
