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iamafrayedknot iamafrayedknot is offline
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Car: 2019 Q50 Red Sport AWD
Default Rough idle - 10-10-2020, 10:11 AM

Hey all, I have been troubleshooting a rough idle recently. Occasionally it hesitates or "bogs" down when taking off from a stop. I do have BOVs and have gone through all vacuum lines and fittings three times now to ensure no leaks. At first the rough idle would go away when I switched to map 0, but I think its a coincidence only, as it is sporadic. I have cleaned the Mass Air Flow sensors too.
Next, I am removing the BOVs.
I would like to think with only 10k on a 2019 it wouldn't be dirty throttle body or clogged fuel injectors. But you all keep me honest here.

I should also mention I did gas up at a 7-11 due to no time to drive to my typical shell station. But have since continued to use Shell gas.

If there is something I am missing, please let me know. Otherwise pulling BOVs tomorrow.


Josh
2019 Q50S AWD
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jrobohm jrobohm is offline
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Default 10-10-2020, 01:59 PM

IF in doubt about fuel - burn it up with some Sunday highway driving and fill up with gas from a reliable station.


2017 Q50 Premium RWD
  • BMS JB4 w/ Fuel Wires
  • BMS CAI w/ Inlets
  • BMS WMI w/ PM3.5s
  • Pure Stage 2 Turbos
  • Z1 PU Motor Mounts
  • AMS HX w/ Aux Tank & IC Pump
  • AMS HPFP (RA338) & LPFP
  • AMS Flex Fuel Kit
  • AMS LDP
  • Fast Intentions Res. Touring 2.5 CBE
  • Mishimoto Oil Catch Can
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iamafrayedknot iamafrayedknot is offline
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Default 10-11-2020, 09:57 AM

Burnt up all the fuel last night and filled up at Shell.

I pulled apart all of the intake and removed the BOVs, checked all vacuum lines again.

I pulled the MAF and MAP sensors and cleaned them.

Still hesitating and fluctuating idle.

I put injector cleaner in this tank of gas. I guess next weekend I'm going to check the Evap canister and finally the fuel injectors.

Idle fluctuations and hestitation on throttle. - YouTube


Josh
2019 Q50S AWD
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JCB JCB is offline
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Default 10-13-2020, 09:32 AM

If it is a 2019 and 10k miles, why are you messing with it? Was it salvage and not under warranty? Take off the JB4 and bring it in to a dealer if the warranty is not invalid for some reason.
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iamafrayedknot iamafrayedknot is offline
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Default Today, 08:56 AM

I could take it in.

However, I have the time and ability to look at it myself, I like to learn more about systems and mechanics. I have been working on & operating vehicles and aircraft since I was 13.

Issue Resolved: Dirty injector

The two possible root causes I suspect are:

1. Bad fuel - I stopped at a no-name gas station to fill up when I had previously always gone to Shell.

I will stick to Shell

2. Royal Purple Max Boost Octane Additive - I suspect this less than the above as I have only ran a total of 5 tanks of gas with Octane Booster in 10k miles. Though the weekend prior to the issue, I did run a tank with Booster.

I will switch to 103 octane gas for those spirited weekends.

Have a good one!


Josh
2019 Q50S AWD
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jrobohm jrobohm is offline
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Car: 2017 Q50 3.0T Premium RWD
Default Today, 09:11 AM

Watch out for MMT based Octane Boosters - while very effective - they leave orange deposits in the combustion chamber and should be used sparingly IMHO.


2017 Q50 Premium RWD
  • BMS JB4 w/ Fuel Wires
  • BMS CAI w/ Inlets
  • BMS WMI w/ PM3.5s
  • Pure Stage 2 Turbos
  • Z1 PU Motor Mounts
  • AMS HX w/ Aux Tank & IC Pump
  • AMS HPFP (RA338) & LPFP
  • AMS Flex Fuel Kit
  • AMS LDP
  • Fast Intentions Res. Touring 2.5 CBE
  • Mishimoto Oil Catch Can
  • EcuTek Flash (Seb @ Specialty Z)
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iamafrayedknot iamafrayedknot is offline
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Car: 2019 Q50 Red Sport AWD
Default Today, 10:20 AM

Thanks for the heads up.


Josh
2019 Q50S AWD
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