Weird start ups

ClemsonVQdude · 02-12-2018, 12:48 PM

Sup guys, I got a 13’ 370 about 3 months ago, loving it. Recently its been doing this weird thing when i start it up where it cranks up and then the engine bogs back down after about a second after all the gauges do their little up-down dance and sounds like ita about to turn back off, yesterday it actually did turn back off after start up and I had to turn it off via the button and then start it up again and it cranked fine.
Is it maybe the battery? Or an issue with the ignition? Probably going to get the battery checked out tomorrow morning but Any help will be appreciated, thanka

JLarson · 02-12-2018, 12:49 PM

Sounds more like MAF sensor to me, based on what you've written. Tried cleaning them yet? I'd do that and maybe clean the Throttle Bodies while I was at it.

SouthArk370Z · 02-12-2018, 01:23 PM

Cleaning the MAFs is an easy job - even for a new mechanic. Remove two screws per MAF, pull MAFs out of duct, spray MAFs with cleaner, let dry, replace MAFs.

Checking battery voltage is even easier but will require two people. Check volts at battery when car is off. Check volts at battery while car is cranking. I don't remember the numbers you should get - Google is your friend.

cv129 · 02-12-2018, 02:44 PM

I agree sounds like dirty MAF, same thing happened to my G37 last year. Here is a DIY that may be helpful.

https://www.myg37.com/forums/d-i-y-i...le-bodies.html

Somewhere in the thread also includes steps to reset ECU to correct high idle after cleaning.

ClemsonVQdude · 02-13-2018, 08:15 AM

Cool thanks guys, I’ll do that today and see if it helps

onzedge · 02-13-2018, 05:07 PM

Quote:

Originally Posted by JLarson

Sounds more like MAF sensor to me, based on what you've written. Tried cleaning them yet? I'd do that and maybe clean the Throttle Bodies while I was at it.

Quote:

Originally Posted by SouthArk370Z

Cleaning the MAFs is an easy job - even for a new mechanic. Remove two screws per MAF, pull MAFs out of duct, spray MAFs with cleaner, let dry, replace MAFs.

Checking battery voltage is even easier but will require two people. Check volts at battery when car is off. Check volts at battery while car is cranking. I don't remember the numbers you should get - Google is your friend.

I use this stuff a couple of times per year...

ClemsonVQdude · 02-13-2018, 06:27 PM

Quote:

Originally Posted by onzedge

I use this stuff a couple of times per year...

Yep I used this today and cleaned them out. Seems good so far. If it happens again i’ll clean the throttle bodies too. Thanks guys.

Quicksilvers · 02-14-2018, 05:54 AM

^Sounds like your MAF sensor is dirty and needs to be cleaned. I cleaned my MAF sensor when I did my last oil change and it was abit dirty and needed to be cleaned.

Tractionless · 02-17-2018, 01:43 PM

Quote:

Originally Posted by onzedge

I use this stuff a couple of times per year...

If running K+N's (or other oiled elements) even more often.

02-12-2018, 12:48 PM	#1 (permalink)
ClemsonVQdude Base Member Join Date: Dec 2017 Location: Anderson SC Posts: 52 Drives: 2013 Nissan 370z Rep Power: 7	Weird start ups Sup guys, I got a 13’ 370 about 3 months ago, loving it. Recently its been doing this weird thing when i start it up where it cranks up and then the engine bogs back down after about a second after all the gauges do their little up-down dance and sounds like ita about to turn back off, yesterday it actually did turn back off after start up and I had to turn it off via the button and then start it up again and it cranked fine. Is it maybe the battery? Or an issue with the ignition? Probably going to get the battery checked out tomorrow morning but Any help will be appreciated, thanka

02-12-2018, 12:49 PM	#2 (permalink)
JLarson A True Z Fanatic Join Date: Jun 2017 Location: Media, PA Posts: 4,074 Drives: 14 Nissan 370z MR M6 Rep Power: 2684369	Sounds more like MAF sensor to me, based on what you've written. Tried cleaning them yet? I'd do that and maybe clean the Throttle Bodies while I was at it. onzedge, cv129 and axmea? like this. __________________ 2014 370z Touring Sport Magma Red MT // BP Single Turbo 6467 // 63mm TB's // Z1 Ported Upper Mani // RJM Pedal // Zspeed Stage 3 Clutch // 526 WHP, 451 WTQ 2006 350z (Sold) // 1990 300zx (Sold) // 1985 300zx 2+2 (Sold)

02-12-2018, 01:23 PM	#3 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324197	Cleaning the MAFs is an easy job - even for a new mechanic. Remove two screws per MAF, pull MAFs out of duct, spray MAFs with cleaner, let dry, replace MAFs. Checking battery voltage is even easier but will require two people. Check volts at battery when car is off. Check volts at battery while car is cranking. I don't remember the numbers you should get - Google is your friend. cv129 likes this. __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

02-12-2018, 02:44 PM	#4 (permalink)
cv129 A True Z Fanatic Join Date: Jul 2011 Location: Dallas, TX Posts: 3,192 Drives: 09 Nismo, 16 Nismo Rep Power: 159827	I agree sounds like dirty MAF, same thing happened to my G37 last year. Here is a DIY that may be helpful. https://www.myg37.com/forums/d-i-y-i...le-bodies.html Somewhere in the thread also includes steps to reset ECU to correct high idle after cleaning. axmea? likes this. __________________ Setrab \| RE-71 \| SPL \| JRZ \| Nismo \| ARK \| Whiteline \| RacingBrake \| CJM Oil Pan \| Ti shield

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02-13-2018, 08:15 AM	#5 (permalink)
ClemsonVQdude Base Member Join Date: Dec 2017 Location: Anderson SC Posts: 52 Drives: 2013 Nissan 370z Rep Power: 7	Cool thanks guys, I’ll do that today and see if it helps

02-14-2018, 05:54 AM	#8 (permalink)
Quicksilvers A True Z Fanatic Join Date: May 2017 Location: Atlanta, GA Posts: 2,039 Drives: 2017 370z Rep Power: 25462	^Sounds like your MAF sensor is dirty and needs to be cleaned. I cleaned my MAF sensor when I did my last oil change and it was abit dirty and needed to be cleaned.