Direct Injector Failure Poll - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

vubaru · 06-05-2013, 02:19 PM

OK, I haven't checked my injectors yet but I am getting some backfiring/popping between aggressive shifts occasionally on my BRZ w/ AVO Stage 1 turbo kit. During my major cam issues and an idle stall/shudder event, I did throw a P0300 misfire, but it hasn't done it again since the cam repairs and I have not thrown a single code since then.

Is the slight popping/backfiring between shifts normal with a high-flow cat and engine back exhaust, or should I start worrying about replacing injectors etc?

wheelhaus · 06-05-2013, 02:30 PM

Is there any correlation to VIN#s or manufacture dates?

Quote:

Originally Posted by vubaru

Is the slight popping/backfiring between shifts normal with a high-flow cat and engine back exhaust, or should I start worrying about replacing injectors etc?

Some backfiring popping from the exhaust on throttle/RPM transition is not a sign of preignition/knock/ping/detonation, especially with aftermarket exhaust, FI, tuning, etc.

Carwhisperer · 06-05-2013, 02:33 PM

Quote:

Originally Posted by vubaru

OK, I haven't checked my injectors yet but I am getting some backfiring/popping between aggressive shifts occasionally on my BRZ w/ AVO Stage 1 turbo kit. During my major cam issues and an idle stall/shudder event, I did throw a P0300 misfire, but it hasn't done it again since the cam repairs and I have not thrown a single code since then.

Is the slight popping/backfiring between shifts normal with a high-flow cat and engine back exhaust, or should I start worrying about replacing injectors etc?

Im all stock and experience it rarely. Its not a pleasant sound either, Is yours a muffled single pop coming straight from under the car?

Sportsguy83 · 06-05-2013, 02:49 PM

Quote:

Originally Posted by vubaru

OK, I haven't checked my injectors yet but I am getting some backfiring/popping between aggressive shifts occasionally on my BRZ w/ AVO Stage 1 turbo kit. During my major cam issues and an idle stall/shudder event, I did throw a P0300 misfire, but it hasn't done it again since the cam repairs and I have not thrown a single code since then.

Is the slight popping/backfiring between shifts normal with a high-flow cat and engine back exhaust, or should I start worrying about replacing injectors etc?

When you are turbo and have a vented to atmosphere BOV and it is post MAF sensor like the AVO kit, you will be RICH on shifts (lift gas pedal BOV dumps metered air to atmosphere gas is left in the cylinder to be burned), and thus the unburned fuel will backfire and pop in the exhaust. That has nothing to do with this issue.

vubaru · 06-05-2013, 02:50 PM

My VIN is **2379 (BRZ).

@wheelhaus, thanks for the response all the injector failure threads are making me paranoid.

@Carwhisperer, we may be experiencing different things but I don't know. The main analogy I can make is to my old 2.5 RS which had headerback exhaust with Borla UEL's, under shifting there is a slight burble or rasp, or occasionally a single muffled pop as you describe between shifts (mostly when driving aggressively). But no CEL's or DTC's when it occurs and my Ecutek logs do not show me running lean...if anything Paul says I'm running rich.

@Sportsguy83 David I have a full recirc BOV, but you are correct that Paul has advised I am running a bit rich. I suspected this was unburned fuel but again, am just paranoid and better safe than sorry!

After the misfires I'm still a bit concerned but I'll just monitor and keep an eye on it.

Sportsguy83 · 06-05-2013, 02:52 PM

Quote:

Originally Posted by vubaru

@Sportsguy83 David I have a full recirc BOV, but you are correct that Paul has advised I am running a bit rich. I suspected this was unburned fuel but again, am just paranoid and better safe than sorry!

After the misfires I still feel like the best practice would be to check plugs and the injectors so I better have someone do that just in case...

I have the AVO BOV set 50/50 to vent and you can hear the pop on most shifts, but its unburned fuel, you are probably getting something very similar.

zc06_kisstherain · 06-05-2013, 03:13 PM

poll!!!! yeah like others said we need "don't have issue yet!" on choices

Bg8780 · 06-05-2013, 03:24 PM

I've heard the popping from directly under neath the car (almost right below my butt it feels like) but I have not thrown any codes yet and it's only happened twice. I'm waiting for the injector tune fix from FA20club to see if it happens after I flash the update.

Running slighlty modded. FA20club CAI and Tune.

VIN # *******5563

zc06_kisstherain · 06-05-2013, 03:45 PM

if Toyota/Subaru doesn't come out with solution for long time, other alternative is getting ECU flashe through Tuners

Bg8780 · 06-05-2013, 06:02 PM

Quote:

Originally Posted by zc06_kisstherain

if Toyota/Subaru doesn't come out with solution for long time, other alternative is getting ECU flashe through Tuners

I'm hoping just an ECU flash can be the remedy. From what I've read it looks like it is a heat issue with the injector seals so I'm not sure if new calibrations can fix this. Anyone who knows that they are talking about want to chime in?

xjohnx · 06-05-2013, 06:34 PM

Quote:

Originally Posted by Bg8780

I'm hoping just an ECU flash can be the remedy. From what I've read it looks like it is a heat issue with the injector seals so I'm not sure if new calibrations can fix this. Anyone who knows that they are talking about want to chime in?

The heat issue is caused by the ECU mapping resulting in detonation. Fix the ECU, fix the problem (in theory.)

Bg8780 · 06-05-2013, 08:08 PM

Quote:

Originally Posted by xjohnx

The heat issue is caused by the ECU mapping resulting in detonation. Fix the ECU, fix the problem (in theory.)

Beautiful! I'm tempted to stop driving and just hitch rides to work until I get the update in my inbox. Especially since it just keeps getting hotter around here.

Carwhisperer · 06-05-2013, 08:20 PM

Hey take off the bottom "I do not have an issue" pole. It's going to throw everything else off once there is a good amount of feedback. Unless if you know how to do conversions well.

track_warrior · 06-05-2013, 08:25 PM

Quote:

Originally Posted by xjohnx

The heat issue is caused by the ECU mapping resulting in detonation. Fix the ECU, fix the problem (in theory.)

I know of two other people that might not be on this forum that are Viconti tuned and have had a DI issue, ill try to send them a txt to visit this poll.

Quote:

Originally Posted by Carwhisperer

Hey take off the bottom "I do not have an issue" pole. It's going to throw everything else off once there is a good amount of feedback. Unless if you know how to do conversions well.

Just sent a pm to a moderator.

View Poll Results: Have you had an issue with your Direct Injection System?
I have had a DI issue and was fixed under warranty (Subaru)	10	12.35%
I had a DI issue that caused Engine Failure and was fixed under warranty (Subaru)	2	2.47%
I have had a DI issue and was fixed under warranty (Toyota)	31	38.27%
I have had a DI issue that caused Engine Failure and was fixed under warranty (Toyota)	3	3.70%
I have had a DI issue and denied warranty by (Subaru)	7	8.64%
I have had a DI issue and denied warranty by (Toyota)	14	17.28%
I had a DI issue that caused Engine Failure and was Denied warranty (Subaru)	8	9.88%
I had a DI issue that caused Engine Failure and was Denied warranty (Toyota)	6	7.41%
Voters: 81. You may not vote on this poll

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06-05-2013, 02:19 PM	#15
vubaru Now with Boost! Join Date: Aug 2012 Drives: 2013 SWP BRZ Ltd. Location: Bay Area, CA Posts: 415 Thanks: 281 Thanked 424 Times in 257 Posts Mentioned: 24 Post(s) Tagged: 0 Thread(s)	OK, I haven't checked my injectors yet but I am getting some backfiring/popping between aggressive shifts occasionally on my BRZ w/ AVO Stage 1 turbo kit. During my major cam issues and an idle stall/shudder event, I did throw a P0300 misfire, but it hasn't done it again since the cam repairs and I have not thrown a single code since then. Is the slight popping/backfiring between shifts normal with a high-flow cat and engine back exhaust, or should I start worrying about replacing injectors etc?

06-05-2013, 02:50 PM	#19
vubaru Now with Boost! Join Date: Aug 2012 Drives: 2013 SWP BRZ Ltd. Location: Bay Area, CA Posts: 415 Thanks: 281 Thanked 424 Times in 257 Posts Mentioned: 24 Post(s) Tagged: 0 Thread(s)	My VIN is **2379 (BRZ). @wheelhaus, thanks for the response all the injector failure threads are making me paranoid. @Carwhisperer, we may be experiencing different things but I don't know. The main analogy I can make is to my old 2.5 RS which had headerback exhaust with Borla UEL's, under shifting there is a slight burble or rasp, or occasionally a single muffled pop as you describe between shifts (mostly when driving aggressively). But no CEL's or DTC's when it occurs and my Ecutek logs do not show me running lean...if anything Paul says I'm running rich. @Sportsguy83 David I have a full recirc BOV, but you are correct that Paul has advised I am running a bit rich. I suspected this was unburned fuel but again, am just paranoid and better safe than sorry! After the misfires I'm still a bit concerned but I'll just monitor and keep an eye on it.

06-05-2013, 03:24 PM	#22
Bg8780 Senior Member Join Date: Jun 2012 Drives: '13 Black Subaru BRZ Limited Location: All over Posts: 479 Thanks: 439 Thanked 156 Times in 96 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	I've heard the popping from directly under neath the car (almost right below my butt it feels like) but I have not thrown any codes yet and it's only happened twice. I'm waiting for the injector tune fix from FA20club to see if it happens after I flash the update. Running slighlty modded. FA20club CAI and Tune. VIN # *******5563

06-05-2013, 08:20 PM	#27
Carwhisperer Senior Member Join Date: Jan 2012 Drives: A lot of supercars. Location: USA Posts: 495 Thanks: 237 Thanked 148 Times in 90 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	Hey take off the bottom "I do not have an issue" pole. It's going to throw everything else off once there is a good amount of feedback. Unless if you know how to do conversions well.

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