Engine knocking after flash - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Tenchi · 09-25-2014, 10:58 PM

I wAs running e85, ran the the tank empty and then filled up with 93. Let the car run for a few minutes then flashed with my OFT to a 93 octane map. When I went to restart the car bucked and stumbled then after 20 seconds or so started idling down. I watched the fuel trims and they are high around 6-10. In neutral I rev the engine a little and I can hear it knock. Please help!!

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Tenchi · 09-25-2014, 11:04 PM

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Turdinator · 09-25-2014, 11:20 PM

I recently went back from E85 to petrol. I didn't get any knock but I had huge fuel trims for a while. But I flashed back to 1.59 as I new my car ran well on it. I am saving the 2.06 tunes for my second tank of petrol.

If you are experiencing knock maybe flash the 91 tune and drive conservatively and moniter you AFR for this tank while it still has some ethanol in the mix.

Shiv@Openflash · 09-25-2014, 11:20 PM

You aren't hearing knock in neutral while revving the engine. That's going to be pretty much impossible. It's likely you are just hearing some exhaust popping as the e85 slowly flushes out of the system. If you just let it idle, it will take several minutes for the E85 in the fuel lines to flush. Instead, I recommend just driving it normally as the extra engine load will speed the process up.

Tenchi · 09-25-2014, 11:35 PM

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Shiv@Openflash · 09-25-2014, 11:50 PM

Those positive fuel trims are normal when you are running residual E85 on a pump gas map. No need to worry.

Tenchi · 09-25-2014, 11:55 PM

Thanks Shiv. I was having a panic attack. She's running smoothly now. Why would ignition adv be around 40?

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Shiv@Openflash · 09-25-2014, 11:58 PM

Quote:

Originally Posted by Tenchi

Thanks Shiv. I was having a panic attack. She's running smoothly now. Why would ignition adv be around 40?

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Because that is where it is supposed to be when you are revving your engine like that

Tenchi · 09-26-2014, 12:01 AM

Lol oh poor me. Thanks Shiv.

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Shiv@Openflash · 09-26-2014, 12:24 AM

Quote:

Originally Posted by Tenchi

Lol oh poor me. Thanks Shiv.

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No sweat

steve99 · 09-26-2014, 12:50 AM

Quote:

Originally Posted by Tenchi

I wAs running e85, ran the the tank empty and then filled up with 93. Let the car run for a few minutes then flashed with my OFT to a 93 octane map. When I went to restart the car bucked and stumbled then after 20 seconds or so started idling down. I watched the fuel trims and they are high around 6-10. In neutral I rev the engine a little and I can hear it knock. Please help!!

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have a read of the links below theier is a pain free proceedure to swith between e85 and petrol and vice versa

09-25-2014, 10:58 PM	#1
Tenchi Senior Member Join Date: Feb 2014 Drives: Silver Ignition 6MT 10 series FR-S Location: Rochester NY Posts: 162 Thanks: 95 Thanked 66 Times in 36 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Engine knocking after flash I wAs running e85, ran the the tank empty and then filled up with 93. Let the car run for a few minutes then flashed with my OFT to a 93 octane map. When I went to restart the car bucked and stumbled then after 20 seconds or so started idling down. I watched the fuel trims and they are high around 6-10. In neutral I rev the engine a little and I can hear it knock. Please help!! Sent from my iPhone using Tapatalk

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09-25-2014, 11:04 PM	#2
Tenchi Senior Member Join Date: Feb 2014 Drives: Silver Ignition 6MT 10 series FR-S Location: Rochester NY Posts: 162 Thanks: 95 Thanked 66 Times in 36 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Sent from my iPhone using Tapatalk

09-25-2014, 11:20 PM	#4
Shiv@Openflash Senior Member Join Date: Sep 2013 Drives: 2013 FRS Location: SF, CA Posts: 2,629 Thanks: 1,055 Thanked 5,470 Times in 1,494 Posts Mentioned: 605 Post(s) Tagged: 9 Thread(s)	You aren't hearing knock in neutral while revving the engine. That's going to be pretty much impossible. It's likely you are just hearing some exhaust popping as the e85 slowly flushes out of the system. If you just let it idle, it will take several minutes for the E85 in the fuel lines to flush. Instead, I recommend just driving it normally as the extra engine load will speed the process up.

09-25-2014, 11:35 PM	#5
Tenchi Senior Member Join Date: Feb 2014 Drives: Silver Ignition 6MT 10 series FR-S Location: Rochester NY Posts: 162 Thanks: 95 Thanked 66 Times in 36 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Sent from my iPhone using Tapatalk

09-25-2014, 11:50 PM	#6
Shiv@Openflash Senior Member Join Date: Sep 2013 Drives: 2013 FRS Location: SF, CA Posts: 2,629 Thanks: 1,055 Thanked 5,470 Times in 1,494 Posts Mentioned: 605 Post(s) Tagged: 9 Thread(s)	Those positive fuel trims are normal when you are running residual E85 on a pump gas map. No need to worry.

09-25-2014, 11:55 PM	#7
Tenchi Senior Member Join Date: Feb 2014 Drives: Silver Ignition 6MT 10 series FR-S Location: Rochester NY Posts: 162 Thanks: 95 Thanked 66 Times in 36 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Thanks Shiv. I was having a panic attack. She's running smoothly now. Why would ignition adv be around 40? Sent from my iPhone using Tapatalk

09-26-2014, 12:01 AM	#9
Tenchi Senior Member Join Date: Feb 2014 Drives: Silver Ignition 6MT 10 series FR-S Location: Rochester NY Posts: 162 Thanks: 95 Thanked 66 Times in 36 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Lol oh poor me. Thanks Shiv. Sent from my iPhone using Tapatalk

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