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Occasionally backfiring? Anyone else have this?

Started by TopherSho, October 18, 2017, 09:10:12 PM

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TopherSho

October 18, 2017, 09:10:12 PM
Have not been able to log it yet.. but 1:10 wot runs from first gear through second result in a small single backfire. Then shift.  It occurs RIGHT BEFORE the shift and NOT during the shift.  It feels like a rpm overrun.. but it is not in my observation overreving ..

Thoughts (yes emailed Brad)
2010 non-pp, 98k miles, 3-bar,  .026 plugs, SNOW-KIT STG1, AJPTurbu tune#35, 15.5+psi
Best 0-60 public road 4.35s
Best 1/4 of 12.61 no DA correction

ZSHO

#1
October 19, 2017, 09:43:10 AM Last Edit: October 19, 2017, 03:26:38 PM by ZSHO
I would check your spark plugs or COP or your CAC (intercooler) to make sure its not pooled with crud.
Did you happen to check for Codes?  Z


2013 Performance Package SHO| Livernois Custom Methanol Tune|3-Bar Map|Reische-170-Stat|Full Race Tial-10psi BOV in Black|PPE-Gloss Black Hot Pipes|EPP Dual Intake in Gloss Black|PPE Catted DP|Corsa Sport Cat Back Exhaust|H&R Sport-Springs|CFM Performance Billet Valve Cover Breather In Gloss Black|Llumar 20%Ceramic window Tint|MSD Ignition Coils in Black|Extreme Roof Spoiler|Redline Fluids all around|Gearhead Intercooler|First-SHO With Direct Port Alky-VP-M1-100%-Methanol Injection|LMS-Custom-Dyno-Tuned @ 415whp-465wtq| Best Trap Speed of 115.54 mph|

TopherSho

#2
October 19, 2017, 08:40:23 PM
Quote from: ZSHO on October 19, 2017, 09:43:10 AM
I would check your spark plugs or COP or your CAC (intercooler) to make sure its not pooled with crud.
Did you happen to check for Codes?  Z

Na no code checking.  But I will now that you mention it.   
2010 non-pp, 98k miles, 3-bar,  .026 plugs, SNOW-KIT STG1, AJPTurbu tune#35, 15.5+psi
Best 0-60 public road 4.35s
Best 1/4 of 12.61 no DA correction

StealBlueSho

#3
October 19, 2017, 09:28:39 PM
Not common on this platform at all... I have not run across it on the forums...

Usually a timing issue... but could be a fouled plug or COP... check a log for misfires, pull the plugs (all of them) and check for issues.

Z has a good idea with the CAC... but as much as your on it, I'm sure the CAC has been cleared out by now lol.

TopherSho

#4
October 20, 2017, 12:45:38 PM
Quote from: StealBlueSho on October 19, 2017, 09:28:39 PM
Not common on this platform at all... I have not run across it on the forums...

Usually a timing issue... but could be a fouled plug or COP... check a log for misfires, pull the plugs (all of them) and check for issues.

Z has a good idea with the CAC... but as much as your on it, I'm sure the CAC has been cleared out by now lol.

I think it is a timing issue as well, interestingly i have been hard on it all week data logging and have not had it happen.  But when it did happen it was with the wife in the car + groceries .. so it might be load + high rpm + timing related. 

No codes were found .. but it has been at least 10 power cycles since the last !bang!
2010 non-pp, 98k miles, 3-bar,  .026 plugs, SNOW-KIT STG1, AJPTurbu tune#35, 15.5+psi
Best 0-60 public road 4.35s
Best 1/4 of 12.61 no DA correction

SHOdded

#5
October 20, 2017, 05:52:32 PM
Plugs, maybe?  I dont think its the knock sensor wires, but ...
2007 Ford Edge SEL, Powerstop F/R Brake Kit, TXT LED 6000K Lo & Hi Beams, W16W LED Reverse Bulbs, 3BSpec 2.5w Map Lights, 5W Cree rear dome lights, 5W Cree cargo light, DTBL LED Taillights

If tuned:  Take note of the strategy code as you return to stock (including 3 bar MAP to 2 bar MAP) -> take car in & get it serviced -> check strategy code when you get car back -> have tuner update your tune if the strategy code has changed -> reload tune -> ENJOY!

lamrith

#6
October 20, 2017, 06:17:19 PM
Is this happening on meth with meth tune, last I recall you were running meth full time?  If it is happening when you are spraying I would disable the meth system and run a non-meth tune and see if it still happens.

If it goes away completely then time to look at meth system for issues.  Could be tune related, but highly doubtful knowing Brad and the fact that tune ran fine for quite a while.

Did it all happen on a single tank of fuel?  or on sequential tanks both filled from a single station in a short amount of time?  Maybe bad fuel?
'13 Sho PP, SCT x4, AJP 92-Octane rev6 (14psi&20spark) NGK 6510, 3Bar, K&N CAI, PPE Catted DP, Dynomax Axleback, 20*9.5 Voxx Lago w/ 275/40-20 GMAX AS-05.

ZSHO

#7
October 20, 2017, 06:43:40 PM Last Edit: October 20, 2017, 06:45:41 PM by ZSHO
It could be that concocted pale of Methanol you purchased IIRC.  Z
I would verify its the real-deal IMO.


2013 Performance Package SHO| Livernois Custom Methanol Tune|3-Bar Map|Reische-170-Stat|Full Race Tial-10psi BOV in Black|PPE-Gloss Black Hot Pipes|EPP Dual Intake in Gloss Black|PPE Catted DP|Corsa Sport Cat Back Exhaust|H&R Sport-Springs|CFM Performance Billet Valve Cover Breather In Gloss Black|Llumar 20%Ceramic window Tint|MSD Ignition Coils in Black|Extreme Roof Spoiler|Redline Fluids all around|Gearhead Intercooler|First-SHO With Direct Port Alky-VP-M1-100%-Methanol Injection|LMS-Custom-Dyno-Tuned @ 415whp-465wtq| Best Trap Speed of 115.54 mph|

FoMoCoSHO

#8
October 20, 2017, 08:15:29 PM
Is it showing the misfire in your logs?

TopherSho

#9
October 21, 2017, 02:01:53 PM
Well to answer several Q's. The meth is pure VP in thier can.  No mixxing at all.

No codes so far

Boost looked ok. 

Have not pulled the plugs.. but they are less than 10k old

Meth rev3 did not do it.. but it was WARMER then

I think this is cold weather + load in weight + high rpm... But just need to catch it in the act to know more..
2010 non-pp, 98k miles, 3-bar,  .026 plugs, SNOW-KIT STG1, AJPTurbu tune#35, 15.5+psi
Best 0-60 public road 4.35s
Best 1/4 of 12.61 no DA correction

FoMoCoSHO

#10
October 21, 2017, 02:29:09 PM Last Edit: October 21, 2017, 02:36:05 PM by FoMoCoSHO
Did you see an actual misfire in your log?

An unhappy shift setting can cause all kinds of mayhem.

I guess a better question is are you feeling it or hearing a big boom?

If so could it be you are missing an intermittent shift and ecm starts shutting down cylinders but your meth doesn't know?

TopherSho

#11
October 21, 2017, 06:41:22 PM
It feels the same as when I derp it and forget to shift in manual mode :).  You can hear it a d feel a tiny thump bang. 
2010 non-pp, 98k miles, 3-bar,  .026 plugs, SNOW-KIT STG1, AJPTurbu tune#35, 15.5+psi
Best 0-60 public road 4.35s
Best 1/4 of 12.61 no DA correction

SHOdded

#12
October 21, 2017, 09:21:49 PM
Sometimes a TSS/OSS sensor or a solenoid body or even a trans range sensor issue can be responsible.  You can easily track with the X4.  When was trans fluid last changed btw?
2007 Ford Edge SEL, Powerstop F/R Brake Kit, TXT LED 6000K Lo & Hi Beams, W16W LED Reverse Bulbs, 3BSpec 2.5w Map Lights, 5W Cree rear dome lights, 5W Cree cargo light, DTBL LED Taillights

If tuned:  Take note of the strategy code as you return to stock (including 3 bar MAP to 2 bar MAP) -> take car in & get it serviced -> check strategy code when you get car back -> have tuner update your tune if the strategy code has changed -> reload tune -> ENJOY!

TopherSho

#13
October 21, 2017, 10:25:55 PM
Quote from: SHOdded on October 21, 2017, 09:21:49 PM
Sometimes a TSS/OSS sensor or a solenoid body or even a trans range sensor issue can be responsible.  You can easily track with the X4.  When was trans fluid last changed btw?

sadly never.  no-one in town wants to touch it.. i have 3 years on a platinum warranty so i am prepped for a full on replacement eventfully.
2010 non-pp, 98k miles, 3-bar,  .026 plugs, SNOW-KIT STG1, AJPTurbu tune#35, 15.5+psi
Best 0-60 public road 4.35s
Best 1/4 of 12.61 no DA correction

SHOdded

#14
October 21, 2017, 10:48:12 PM
Trans fluid xchange should be easy peasy.  The PTU/RDU, yes, major pushback is the norm.
2007 Ford Edge SEL, Powerstop F/R Brake Kit, TXT LED 6000K Lo & Hi Beams, W16W LED Reverse Bulbs, 3BSpec 2.5w Map Lights, 5W Cree rear dome lights, 5W Cree cargo light, DTBL LED Taillights

If tuned:  Take note of the strategy code as you return to stock (including 3 bar MAP to 2 bar MAP) -> take car in & get it serviced -> check strategy code when you get car back -> have tuner update your tune if the strategy code has changed -> reload tune -> ENJOY!
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