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Evo 8 stutters and goes lean above 20 psi.All of a sudden.

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Old Jan 23, 2018, 02:30 PM
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Originally Posted by 4b11slayer
How do i upload my logs?
http://datazap.me
Old Jan 23, 2018, 02:30 PM
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https://datazap.me/u/4b11slayer/log-...?log=0&data=11
Old Jan 23, 2018, 02:32 PM
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Originally Posted by razorlab
Then it's not fuel cut commanded by the ECU.

It's a stutter and not a "I just hit a brick wall and my car wants to throw me through the windshield", right?
Its more like the car is pulling up the power band then it bucks. Like it loses a cylinder.

Not like i hit wot then it just slows down and gets heavy. Its more of a on off switch when it occurs. i posted a link to my log
Old Jan 23, 2018, 02:51 PM
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Originally Posted by 4b11slayer
Its more like the car is pulling up the power band then it bucks. Like it loses a cylinder.

Not like i hit wot then it just slows down and gets heavy. Its more of a on off switch when it occurs. i posted a link to my log
I can't see crap from that log. You have 1 sample every 200 rpm. Turn off some logging parameters
Old Jan 23, 2018, 02:55 PM
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Originally Posted by razorlab
I can't see crap from that log. You have 1 sample every 200 rpm. Turn off some logging parameters
So log less stuff?
Old Jan 23, 2018, 03:07 PM
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Originally Posted by 4b11slayer
So log less stuff?
yes, log only the essentials. The CT9A logging speed is craptastic compared to the CZ4A.

Have you tried swapping coil packs? I went through a couple sets on my CT9A. They are cheap.
Old Jan 24, 2018, 06:01 AM
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Originally Posted by 4b11slayer
Its more like the car is pulling up the power band then it bucks. Like it loses a cylinder.

Not like i hit wot then it just slows down and gets heavy. Its more of a on off switch when it occurs. i posted a link to my log
Thus the reason I asked you post up a log..

From the little data there is... what stood out was your afrs are all over the place

Try clean that up then continue to diagnose from there...
Old Jan 29, 2018, 07:58 AM
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UPDATE: Purchased and installed a COP set up from JDCUSTOMS (shout out)
It was a DIY cop kit with refurbished coils for $200 to my door.

The issue is gone. The car rips to redline now SUPER SMOOTH never has ran this smooth to redline. I have the plugs gapped at 0.19 still im going to open up the gap as big as it allows me to run. OR SHOULD I NOT?

Just wana give a shout out to everyone who chimed in on suggestions.

For future people with similar issue.

I learned alot from this.

A. A Misfire shows lean spikes on wideband.
B. Oem Ignition coils that test good OHMS may still be BAD.
C. COP Ignition really works and the difference is SUPER.

Also wana give a shout out to (LETSGETTHISDONE) He called it months ago that my Original 155k coils were likely TIRED and thus why when i replace my plugs every oil change my car came alive. KUDOS
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Old Jan 29, 2018, 08:05 AM
  #69  
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See, I am right, sometimes.
Old Jan 29, 2018, 08:28 AM
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Originally Posted by razorlab
See, I am right, sometimes.
Thanks for the help sir
Old Jan 29, 2018, 12:17 PM
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Hey RAZORLAB How much gap should i run now that im on a cop system?

30 psi SS red
e85
gsc s2
Bpr8es (0.21) with oem coils was what i ran
Old Jan 29, 2018, 04:54 PM
  #72  
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Glad you figured it out.


I would still gap to .020".
Old Jan 29, 2018, 05:04 PM
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I gapped my bpr8es at 0.25.

The car runs amazing and pulls harder then ever all the way to redline. I also made some afr tweaks and seeing 11.3 out the top.

With 0.5 counts of knock around 6800 rpm.
Old Jan 29, 2018, 05:31 PM
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.5 counts, or .5volts? Also, you should be running BPR7es until you intend to push it past 750whp or so.
Old Jan 29, 2018, 05:36 PM
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Originally Posted by letsgetthisdone
.5 counts, or .5volts? Also, you should be running BPR7es until you intend to push it past 750whp or so.
0.5 counts. 1 count. 1.5 volts. So it isnt bothering me since knock voltage is like 1.3 at idle..

Ive used the bpr7 and felt sluggish.


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