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Car jerking coz of rich afrs?

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Old Oct 28, 2017, 05:58 AM   #1
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Car jerking coz of rich afrs?

What afrs would u recommend at wide open throttle for 89octane on a stock evo with just an exhaust?
I have a sputtering issue at third gear and fourth.. changed coils, plugs, tested leaks, fuel pump, everything related to what can cause a sputter.

then i checked my map and saw its going upto 9.5 afr at about 6k rpm.
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Old Oct 28, 2017, 08:33 PM   #2
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Old Oct 29, 2017, 02:39 AM   #3
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If you haven't fixed your blowby problem, that'll be the cause of the misfiring / jerking.
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Old Oct 30, 2017, 01:24 AM   #4
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Originally Posted by RightSaid fred View Post
If you haven't fixed your blowby problem, that'll be the cause of the misfiring / jerking.
would be awesome if u can tell me what to check,
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Old Oct 30, 2017, 01:41 AM   #5
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Originally Posted by RightSaid fred View Post
If you haven't fixed your blowby problem, that'll be the cause of the misfiring / jerking.
I checked for oil residue on the LICP and its very very little. so no, i dont have a blowby problem anymore since i changed my valve cover
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Old Oct 30, 2017, 06:54 PM   #6
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9.5 afr is way too rich. That is definitely causing your misfiring and bucking.
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Old Oct 31, 2017, 03:40 PM   #7
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stock map?
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Old Oct 31, 2017, 04:42 PM   #8
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Originally Posted by TariqEvo View Post
What afrs would u recommend at wide open throttle for 89octane on a stock evo with just an exhaust?
I have a sputtering issue at third gear and fourth.. changed coils, plugs, tested leaks, fuel pump, everything related to what can cause a sputter.

then i checked my map and saw its going upto 9.5 afr at about 6k rpm.
9.5 on your Wideband gauge or 9.5 in the fuel map?

Two totally different things.
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Old Oct 31, 2017, 06:22 PM   #9
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If it's tuned properly, the numbers will be exactly the same.
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Old Nov 1, 2017, 12:56 AM   #10
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Originally Posted by MichaelSuch View Post
9.5 afr is way too rich. That is definitely causing your misfiring and bucking.
this fixed it. Thanks man
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Old Nov 1, 2017, 12:58 AM   #11
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Originally Posted by razorlab View Post
9.5 on your Wideband gauge or 9.5 in the fuel map?

Two totally different things.
well both, see my wideband gauge maxes at 10.0 cant go below that, my maps were also reaching 9.5afrs by redline..

now my map is reaching around 10.5 by redline but the gauge would still read upto 10.0, reducing the afrs fixed the hesitation.
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Old Nov 12, 2017, 04:05 AM   #12
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UPDATE:
I sorted this issue by adjust the fuel map, however, my wideband AFRS are way off with the fuel maps. Fuel maps are at 10.6 by redline, but wideband maxes out at 10.0.
is there a way i can get those two to match up, or atleast get them a bit closer?
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Old Nov 12, 2017, 04:51 AM   #13
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Originally Posted by RightSaid fred View Post
If it's tuned properly, the numbers will be exactly the same.
are you saying mitsubishi engineers dont know how to tune?
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Old Nov 12, 2017, 04:57 AM   #14
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Originally Posted by TariqEvo View Post
UPDATE:
I sorted this issue by adjust the fuel map, however, my wideband AFRS are way off with the fuel maps. Fuel maps are at 10.6 by redline, but wideband maxes out at 10.0.
is there a way i can get those two to match up, or atleast get them a bit closer?
this is normal as the fuel map numbers on the evo do not match the real AFR...

you can spend some time adjusting maf compensation table but you will struggle to get it to match..
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Old Nov 12, 2017, 11:41 AM   #15
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The numbers in the fuel map dont really correlate.
You can by fine tuning injectors and maf.

But you can have a 10.0 afr in high octane map and have a actual afr of 12.0 on the wideband.

If you have aftermarket injectors you can richen or lean globally so your map and wideband are almost the same.
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