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Rough cold startups


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#1 Ramzi200602119

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Posted 03 July 2019 - 03:17 AM

I have a 2015 gtr Its rough on cold startup...a bit lean!! Could it be a bad o2 sensor ?? When it warms up everything is back to normal Sent from my iPhone using Tapatalk

#2 colo_evo

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Posted 03 July 2019 - 06:58 AM

Tuned?

#3 Ramzi200602119

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Posted 03 July 2019 - 07:06 AM

Tuned?



Yes it is tuned!!
But i put the stock files in it just to try
Same thing happens


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#4 colo_evo

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Posted 03 July 2019 - 07:20 AM

Provide more details on the mods, fuel and frequency of the poor starts.

#5 Ramzi200602119

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Posted 03 July 2019 - 07:29 AM

Provide more details on the mods, fuel and frequency of the poor starts.




Mods :
-Cobb big CF air intakes
-GFB respons blow off valves
-Injector dynamics iD1050x
-cobb v3 accessport ecu/tcm
-AMS downpipes
-tommy kaira full titanium midpipes
-tommy kaira full titanium catback
-Dw300c fuel pumps 340lph
-custom tuned by subzero tunedbykami (dubai)
-nGk spark plugs
-Boostlogic fuel pressure sensor kit


Its always happen every morning when i cold start it!
Rough cold starts+ rough idle
The rpm goes up and down a bit!
Ranging from 800 to 1000 rpm
What could be the problem ??


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#6 colo_evo

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Posted 03 July 2019 - 07:43 AM

First of all you cant run the stock cal on those injectors.

Try the cobb ots map for 3" intakes and your injectors. If that fixes it, you have a tune issue.

Still didn't mention what fuel you're on.

#7 Ramzi200602119

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Posted 03 July 2019 - 08:13 AM

First of all you cant run the stock cal on those injectors.
Try the cobb ots map for 3" intakes and your injectors. If that fixes it, you have a tune issue.
Still didn't mention what fuel you're on.




98 octane l!!!
I tried the ots map also! Still does the same thing


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