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Old 12-03-2013, 05:00 AM   #1
Bahraini86
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Code P0351 Trouble shooting?

Been getting CEL upon reaching 7800-8000RPM on Stg 2 pump gas map. The code is P0351. I understand that this code is related to coils. However, I tried to identify the faulty coil via logging misfire on cylinders. There was no misfire shown on any!

I thought of taking the car to the dealer to inspect the issue, but I couldn't reproduce the code on stock tune even after driving her hard for half a tank. Everything was smooth and fine.

My next 2 steps in this pursuit are gonna be:

1- Use a higher octane gas (VP MS019) on stage 2 tune to determine if this is related to our crappy 91oct PG
2- Switch back to Stg 1 tune and use pump gas and rev her past 8000rpm and know if it's a tune or a mechanical related issue


My tuner suggested that it's most probably a mechanical issue. But I want to make sure of that before deciding to remove coils or inspect injector seals.

The car is running just fine with a bit of rough idle on STG 2 map, stock tune and stg 1 are both idling very smooth.

I appreciate any feedback and any suggestions

p.s. This is not another tuner-war thread, just a guy with some issues
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Old 12-03-2013, 11:11 AM   #2
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Old 12-03-2013, 11:15 AM   #3
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Quote:
Originally Posted by Bahraini86 View Post
but I couldn't reproduce the code on stock tune even after driving her hard for half a tank. Everything was smooth and fine.
Ummm.... How could you possibly attempt to reproduce a problem seen only at "7800-8000RPM " with a stock tune?
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Old 12-03-2013, 11:29 AM   #4
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Quote:
Originally Posted by Bahraini86 View Post
Been getting CEL upon reaching 7800-8000RPM on Stg 2 pump gas map. The code is P0351. I understand that this code is related to coils. However, I tried to identify the faulty coil via logging misfire on cylinders. There was no misfire shown on any!

I thought of taking the car to the dealer to inspect the issue, but I couldn't reproduce the code on stock tune even after driving her hard for half a tank. Everything was smooth and fine.

My next 2 steps in this pursuit are gonna be:

1- Use a higher octane gas (VP MS019) on stage 2 tune to determine if this is related to our crappy 91oct PG
2- Switch back to Stg 1 tune and use pump gas and rev her past 8000rpm and know if it's a tune or a mechanical related issue


My tuner suggested that it's most probably a mechanical issue. But I want to make sure of that before deciding to remove coils or inspect injector seals.

The car is running just fine with a bit of rough idle on STG 2 map, stock tune and stg 1 are both idling very smooth.

I appreciate any feedback and any suggestions

p.s. This is not another tuner-war thread, just a guy with some issues
The last digit of misfire codes identifies the cylinder. In your case, it's coil #1, the passenger side front coil.

The code itself is an electrical fault, most commonly caused by a coil starting to fail. If you had failiing injector seals, you would hear a loud popping, and I believe would be more likely to set a P030x code rather than a P035x code.

Easy way to check is to swap coils #1 and #3, and if the code goes away or moves to #3, it's a faulty coil.
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Old 12-03-2013, 12:05 PM   #5
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Quote:
Originally Posted by andrew20195 View Post
The last digit of misfire codes identifies the cylinder. In your case, it's coil #1, the passenger side front coil.

The code itself is an electrical fault, most commonly caused by a coil starting to fail. If you had failiing injector seals, you would hear a loud popping, and I believe would be more likely to set a P030x code rather than a P035x code.

Easy way to check is to swap coils #1 and #3, and if the code goes away or moves to #3, it's a faulty coil.
Thanks... I guess I'll do so
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Old 12-03-2013, 12:06 PM   #6
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Ummm.... How could you possibly attempt to reproduce a problem seen only at "7800-8000RPM " with a stock tune?
I thought with hard driving I might succeed
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Old 12-03-2013, 12:32 PM   #7
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I was getting this as well. For me it happens when doing 0-125mph pulls. I had it happen on the stage 2 tune and the stock tune. They just replaced it under warranty.
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Old 12-03-2013, 02:53 PM   #8
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Originally Posted by Bahraini86 View Post
I thought with hard driving I might succeed
It is just that you cannot GET to 7800-8000 RPM with the stock tune.
You will be bumping against the rev limiter @ ~7400
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Old 12-03-2013, 10:24 PM   #9
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Coils have their ratings, once you go beyond that they could be damaged. To make it work at load levels not seen at stock or bypass issues with even more aggressive ignition will do it too.
Otherwise there would be no need for aftermarket coils to support higher engine load/power levels.
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Old 12-03-2013, 11:01 PM   #10
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Other makes and models don't have these problems even when heavily modified (boosted, high RPM, whatever). OEM coil packs/COPs are usually recommended over aftermarket ignitions for reliability.
At least for my case, an ignition coil should not fail after 3000 miles of revving a stock engine to redline. It's just another cheap, low duty part on this car.
Well, for his case, if the redline is 600 rpm higher, that would mean that at the highest load, also requiring the highest amp draw would need to fire 10 times more per second?
Yes, you could be right.
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Old 12-04-2013, 06:42 AM   #11
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So, I started the trouble shooting last night. CEL came back on stg 2 with Race gas, this meant that it wasn't a fuel related issue.

However, a dramatic change to the scenario occurred when I started hearing BACKFIRE in the engine bay during part throttle tapping under load. It was loud and scary! It came on all maps (STG 1, 2 and stock). It's a clear indication (IMO) of injector seal failure. It did not pull a CEL tho.

Car taken to the dealer's for further inspection
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Old 12-04-2013, 11:18 AM   #12
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However, a dramatic change to the scenario occurred when I started hearing BACKFIRE in the engine bay during part throttle tapping under load. It was loud and scary! It came on all maps (STG 1, 2 and stock). It's a clear indication (IMO) of injector seal failure. It did not pull a CEL tho.
Let us know what they find.
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Old 12-05-2013, 01:17 AM   #13
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Let us know what they find.
So far, they confirmed that it's an injector seal issue. They had a similar issue with another car from my production batch.
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Old 12-05-2013, 03:29 AM   #14
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So far, they confirmed that it's an injector seal issue. They had a similar issue with another car from my production batch.
Did they tell you why the injector seal failed?
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