Lean spike/ stumble at highway speed
Jan 9, 2019, 03:00 PM
#1
Evolving Member
Thread Starter
iTrader: (4)
Join Date: Mar 2009
Location: Dirty streets of Jersey
Posts: 208
Likes: 0
Received 0 Likes
on
0 Posts
Lean spike/ stumble at highway speed
OHello all,
I got a few things installed over a month ago. Gtx3076r, Id1050x, DW65 fuel pump. After having a few issues I went to a tuner who was able to fix all of them.
Long story short, I have an issue that I can’t seem to fix. When I’m cruising at highway speeds (60-80mph) I get a stumble/studder and a lean spike. It only happens at partial throttle. (Like when trying to maintain speed. At WOT and idle it’s near perfect. The tuner said it was a mechanical issue, I think it’s in the tune. Please give me your input.
I got a few things installed over a month ago. Gtx3076r, Id1050x, DW65 fuel pump. After having a few issues I went to a tuner who was able to fix all of them.
Long story short, I have an issue that I can’t seem to fix. When I’m cruising at highway speeds (60-80mph) I get a stumble/studder and a lean spike. It only happens at partial throttle. (Like when trying to maintain speed. At WOT and idle it’s near perfect. The tuner said it was a mechanical issue, I think it’s in the tune. Please give me your input.
Jan 10, 2019, 01:59 PM
#2
I had something similar at partial throttle where it would lean out and stumble between 3-4k rpm. I'm flex fuel tuned. My tuner found a tweak he needed to make in the tune when I had run really good quality of E85 (~e81). At e70 and below I had no issues.
Jan 11, 2019, 02:31 PM
#5
Evolving Member
Thread Starter
iTrader: (4)
Join Date: Mar 2009
Location: Dirty streets of Jersey
Posts: 208
Likes: 0
Received 0 Likes
on
0 Posts
thank you.
Do you remember how he found the issue?
This Monday, I’m literally having the tuner sit in the car with his lab top plugged in while I simulate the issue. Hopefully he finds it then, cause he says everything looks good.
Do you remember how he found the issue?
This Monday, I’m literally having the tuner sit in the car with his lab top plugged in while I simulate the issue. Hopefully he finds it then, cause he says everything looks good.
Jan 12, 2019, 10:57 AM
#6
Do you have OEM fuel rail or aftermarket?
Also look into making sure MAF/MAP tables are tuned correctly and if so, then look into the injector linearization PW adder table, you have to tune that properly as you start using larger and larger injectors.
https://www.evolutionm.net/forums/ec...ion-table.html
Also look into making sure MAF/MAP tables are tuned correctly and if so, then look into the injector linearization PW adder table, you have to tune that properly as you start using larger and larger injectors.
https://www.evolutionm.net/forums/ec...ion-table.html
Jan 23, 2019, 05:08 PM
#7
Evolving Member
Thread Starter
iTrader: (4)
Join Date: Mar 2009
Location: Dirty streets of Jersey
Posts: 208
Likes: 0
Received 0 Likes
on
0 Posts
Do you have OEM fuel rail or aftermarket?
Also look into making sure MAF/MAP tables are tuned correctly and if so, then look into the injector linearization PW adder table, you have to tune that properly as you start using larger and larger injectors.
https://www.evolutionm.net/forums/ec...ion-table.html
Also look into making sure MAF/MAP tables are tuned correctly and if so, then look into the injector linearization PW adder table, you have to tune that properly as you start using larger and larger injectors.
https://www.evolutionm.net/forums/ec...ion-table.html
If it’s not the tune it might be the fuel pump? I’m lost at this point