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Discussion Starter · #1 ·
Long story, lot of information.
The problem is some kind of spark plug blowout. Got my plugs gapped from .024 to.016 and then it is almost always fine. (but still occurs sometimes, i think depending on the weather)
Youtube link of the issue below.

Tuner had 0 issues on the dyno at 0.24 , occurred only on the road.
When i got the car tuned (532hp fly 415lbft on 93 and about 29psi of boost) My AYC pump was dead at that time for about 1,5year.

The tuner thought i probably got bad coils, thats why i needed smaller gaps.
I drove the car for like 6 months with the smaller sparkplug gaps (ILKR8E6)
Meanwhile i was searching for new coils.

Last month i got my AYC pump revised by a evo specialist here in Holland.
On the way home i still had some sparkplug blowout. And even got a message "Service required" with the slippery car symbol when that happened.

Meanwhile i've found some okada coils (Which might not be that more powerfull but should minimum be equal to oem coils)
Installed, reinstalled the .024 coils, and dammit still the same issue.

On the boost meter it seems to occur everytime i hit 21psi, i got some kind of sparkplug blowout and if i keep flooring it under the hesitation, it will still reach 28/29psi but i stop my throttle after i notice the blowout.
At the exact same moment that the blowout starts, i also get the "Service Required" with the slippery car symbol.
I uploaded a short vid.
I put my ASC off myself, but i can put it OFF, or OFF OFF, it doesn't matter, message will pop-up.

Ive checked for boost leaks, there are none.
My compression results are all within 133-138psi
My engine leakdown results are all within 5-8%

Evoscan dtc's
No engine DTC's
Only under CAN MUT III AYC i find the following:

U1417
C121C
U0401
U0100 EFI/Engine-ECU temporary CAN timeout
C1290 temporary CAN timeout

Mods:
Built engine
GSC S2with springs and retainers
GTX3576R G2
ETS recirc downpipe
ETS v2 Extreme catless
MAPerformance 3" intake
MAPerformance tubular manifold
MAPerformance 3.5" intercooler + piping
 

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Try gapping the plugs even tighter. try 0.20 first. I know a couple people run with gaps as small as 0.18 on E85.
 

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The only other thing I can think of is to check your engine grounds and the battery terminals. If you're losing battery power it could cause the ECU blip and the ignition breakup. If you've had your ECU out in the past, check that connector as well. In my mind, you hit a certain load on the engine, torquing it on the mounts and causing a bad/lose ground to become a problem.
 

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Discussion Starter · #5 ·
Thnx for thinking with me.
I've checked all grounding points according to the service manual and reattached and sandpapered some slightly to be sure.
As i log, it shows 14.1-14.3V all the time.
 

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Those codes make me think a wiring issue or a failing ECM. You have a tough situation to troubleshoot. I'm not sure I've seen anyone with the exact same situation but I wish you the best of luck.
 

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10' graphite grey evolution x gsr
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You probably figured this out by now. But after reading through it, i was thinking that you should try to lower your boost and see if the issue stops.
 

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Discussion Starter · #8 ·
@SQUARE bore
We've tested this on road with the tuner and it went away when we lowered the boost.

For what about the codes:i resetted those, only U1417 , C121C , U0401 came back when the slippery car symbol popped up (As this seems to happen above 30psi?.... could this solve my problem?
)

I'm not sure how the 21psi was there the last time, maybe i didn't calibrate the gauge correctly. But i've made some logs yesterday and reattached my boost gauge.
It occurs around 29 psi i think.

With the gapped spark plugs i've had no sparkplug blowout during this run.
With the OEM gap spark plugs i've had the blowout (a well i think it is) I didnt run till the 8200rpm, but i holded it longer as normal to hope something is visable in the logs.

Do you guys see anything abnormal in these logs which might point out the issue?
I've posted 2 links as i'm not able to post the csv file or the excel file.

Excel logs:
OEM gap in 2-3 gear: https://file.io/xbgxJhtEnr3p
smaller gap in 2-3 gear: https://file.io/ecrYWRhUJKEG
 

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@SQUARE bore
We've tested this on road with the tuner and it went away when we lowered the boost.

For what about the codes:i resetted those, only U1417 , C121C , U0401 came back when the slippery car symbol popped up (As this seems to happen above 30psi?.... could this solve my problem?
)

I'm not sure how the 21psi was there the last time, maybe i didn't calibrate the gauge correctly. But i've made some logs yesterday and reattached my boost gauge.
It occurs around 29 psi i think.

With the gapped spark plugs i've had no sparkplug blowout during this run.
With the OEM gap spark plugs i've had the blowout (a well i think it is) I didnt run till the 8200rpm, but i holded it longer as normal to hope something is visable in the logs.

Do you guys see anything abnormal in these logs which might point out the issue?
I've posted 2 links as i'm not able to post the csv file or the excel file.

Excel logs:
OEM gap in 2-3 gear: Deleted
smaller gap in 2-3 gear: Deleted
Long story, lot of information.
The problem is some kind of spark plug blowout. Got my plugs gapped from .024 to.016 and then it is almost always fine. (but still occurs sometimes, i think depending on the weather)
Youtube link of the issue below.

Tuner had 0 issues on the dyno at 0.24 , occurred only on the road.
When i got the car tuned (532hp fly 415lbft on 93 and about 29psi of boost) My AYC pump was dead at that time for about 1,5year.

The tuner thought i probably got bad coils, thats why i needed smaller gaps.
I drove the car for like 6 months with the smaller sparkplug gaps (ILKR8E6)
Meanwhile i was searching for new coils.

Last month i got my AYC pump revised by a evo specialist here in Holland.
On the way home i still had some sparkplug blowout. And even got a message "Service required" with the slippery car symbol when that happened.

Meanwhile i've found some okada coils (Which might not be that more powerfull but should minimum be equal to oem coils)
Installed, reinstalled the .024 coils, and dammit still the same issue.

On the boost meter it seems to occur everytime i hit 21psi, i got some kind of sparkplug blowout and if i keep flooring it under the hesitation, it will still reach 28/29psi but i stop my throttle after i notice the blowout.
At the exact same moment that the blowout starts, i also get the "Service Required" with the slippery car symbol.
I uploaded a short vid.
I put my ASC off myself, but i can put it OFF, or OFF OFF, it doesn't matter, message will pop-up.

Ive checked for boost leaks, there are none.
My compression results are all within 133-138psi
My engine leakdown results are all within 5-8%

Evoscan dtc's
No engine DTC's
Only under CAN MUT III AYC i find the following:

U1417
C121C
U0401
U0100 EFI/Engine-ECU temporary CAN timeout
C1290 temporary CAN timeout

Mods:
Built engine
GSC S2with springs and retainers
GTX3576R G2
ETS recirc downpipe
ETS v2 Extreme catless
MAPerformance 3" intake
MAPerformance tubular manifold
MAPerformance 3.5" intercooler + piping
I just retuned yesterday at sea level and my car is having spark blowout at 29psi as well and I’m down to .15 gap. Did you ever fix yours?
 

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Discussion Starter · #10 ·
I just returned yesterday at sea level and my car is having spark blowout at 29psi as well and I’m down to .15 gap. Did you ever fix yours?
yes, i added the dwell time table and adjusted them in the involved rpm.
ended up with an increase of:
5500-6500 10%
6500-7500 15%
7500-8200 20%
 

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yes, i added the dwell time table and adjusted them in the involved rpm.
ended up with an increase of:
5500-6500 10%
6500-7500 15%
7500-8200 20%
Thank you. I will let my tuner know cause we initially thought it was my plugs but now that I already gapped it so tight, it has to be something else. My spark blowout happens up top 6900rpm-8000rpm when it’s peaking 28.5-29ish psi based on the logs. If I keep the boost below 28psi, it doesn’t blow out.
 
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