Misfire code after install g3 intake

370zbob · 01-16-2013, 02:07 PM

Has anybody had the p300 code when cold starting .
Fitted the g3 intake and a few weeks go by and now when I start and leave to warm up I get the random misfire code .
I want to find out before I take it to the stealership .
Oh I also got a new engine due to high oil consumption about 2months ago .
Anybody ?

Mitco39 · 01-16-2013, 02:58 PM

From my research on this P300 its that it has been found that the stock parameters to set this code are a little tight, meaning that a cold start can sometimes pull the P300 even though nothing is wrong. Could be as simple as now you are getting cold fresh air that the engine has a hard time combusting until it warms up a little.

Mandingo · 01-16-2013, 04:05 PM

I think a misfire can be due a vacuum leak in the intake. Have you checked all the fittings? Maybe one loosened up

370zbob · 01-16-2013, 06:12 PM

Everything is tight .
Spoke to a bro back in the UK who built my r34 motor and said that the mafs are dirty due to stillen not cleaning the tubes after manufacturing them .
I.e bad quality control .
Dismantled and found he was right .
Will find out in the morning .
Thanks bro .

Mitco39 · 01-16-2013, 08:13 PM

Makes you wonder what else the engine sucked in then :/

370zbob · 01-17-2013, 04:50 PM

Well cleaned out the mafs and no code .
Spoke to my buddy again and he said that it shouldn't hurt the engine .
Pull the plugs to see if there is any fouling .
Did that and all is good .
Gona be calling stillen .
Kinda pissed .

370zbob · 01-17-2013, 04:52 PM

Oh and checked the cylinders with boroscope and the crowns are fine .

01-16-2013, 02:07 PM	#1 (permalink)
370zbob Base Member Join Date: Jan 2012 Location: So Cal Posts: 85 Drives: Like a lunatic Rep Power: 13	Misfire code after install g3 intake Has anybody had the p300 code when cold starting . Fitted the g3 intake and a few weeks go by and now when I start and leave to warm up I get the random misfire code . I want to find out before I take it to the stealership . Oh I also got a new engine due to high oil consumption about 2months ago . Anybody ?

01-16-2013, 02:58 PM	#2 (permalink)
Mitco39 A True Z Fanatic Join Date: Aug 2012 Location: Edmonton Alberta Canada Posts: 2,089 Drives: 40th 370z Rep Power: 131	From my research on this P300 its that it has been found that the stock parameters to set this code are a little tight, meaning that a cold start can sometimes pull the P300 even though nothing is wrong. Could be as simple as now you are getting cold fresh air that the engine has a hard time combusting until it warms up a little. __________________ 2007 Chevy Duramax - EFILive Tuned By Me 2010 40th W/ Nav - Boosted Performance - UpRev Tuned By Me The Mrs. Ride -2012 335XI N55 BMW - Cobb Tuned By Me, Built by her My Build --> http://www.the370z.com/members-370z-...39s-build.html

01-16-2013, 04:05 PM	#3 (permalink)
Mandingo Track Member Join Date: Nov 2010 Location: Dallas Posts: 624 Drives: '10 370z 6spd Rep Power: 3370	I think a misfire can be due a vacuum leak in the intake. Have you checked all the fittings? Maybe one loosened up __________________ some mods

01-16-2013, 08:13 PM	#5 (permalink)
Mitco39 A True Z Fanatic Join Date: Aug 2012 Location: Edmonton Alberta Canada Posts: 2,089 Drives: 40th 370z Rep Power: 131	Makes you wonder what else the engine sucked in then :/ __________________ 2007 Chevy Duramax - EFILive Tuned By Me 2010 40th W/ Nav - Boosted Performance - UpRev Tuned By Me The Mrs. Ride -2012 335XI N55 BMW - Cobb Tuned By Me, Built by her My Build --> http://www.the370z.com/members-370z-...39s-build.html

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01-16-2013, 06:12 PM	#4 (permalink)
370zbob Base Member Join Date: Jan 2012 Location: So Cal Posts: 85 Drives: Like a lunatic Rep Power: 13	Everything is tight . Spoke to a bro back in the UK who built my r34 motor and said that the mafs are dirty due to stillen not cleaning the tubes after manufacturing them . I.e bad quality control . Dismantled and found he was right . Will find out in the morning . Thanks bro .

01-17-2013, 04:50 PM	#6 (permalink)
370zbob Base Member Join Date: Jan 2012 Location: So Cal Posts: 85 Drives: Like a lunatic Rep Power: 13	Well cleaned out the mafs and no code . Spoke to my buddy again and he said that it shouldn't hurt the engine . Pull the plugs to see if there is any fouling . Did that and all is good . Gona be calling stillen . Kinda pissed .

01-17-2013, 04:52 PM	#7 (permalink)
370zbob Base Member Join Date: Jan 2012 Location: So Cal Posts: 85 Drives: Like a lunatic Rep Power: 13	Oh and checked the cylinders with boroscope and the crowns are fine .