Car almost stalls after start.

hansoac · 05-10-2011, 08:15 AM

Well, I am up to 9,700 miles on my 09' Z and am experiencing an issue that has me a bit worried. After the car sits for awhile (I can't say exactly how long because I am trying to start after it has been sitting overnight), when I press the start button, the car has no problem turning over, but once it does it starts to stumble for a few seconds and almost stalls out. The RPM's stay below one at this time..but after a few seconds the RPMS bump up to where they should be and it starts to idle no problem. I also feel like the car's throttle response just isn't what it should be. The pedal feels very heavy compared to my 350 and I know it should be more re-active than what it is. I am wondering if maybe it is a filter or injectors? However, I am not an expert when it comes to cars and am turning to you gurus for some advice! Thanks in advance.

Econ · 05-10-2011, 08:27 AM

take it to the dealer. you still have warrante on it?

USMCASA · 05-10-2011, 08:46 AM

bad gas? i'd definitely take it to the dealer asap

Econ · 05-10-2011, 08:54 AM

especially at the 9700 mile mark...

i always find that dealers give me less of a hard time pre 10k mile mark...

usually no questions asked cars considered relativley "new"

kenchan · 05-10-2011, 09:21 AM

yah, it could be a number of things, just take it to the dealer for the time being.

hansoac · 05-10-2011, 09:32 AM

Ok. I have an appointment scheduled for 11! Hopefully no terrible news

onzedge · 05-10-2011, 09:33 AM

Quote:

Originally Posted by hansoac

Ok. I have an appointment scheduled for 11! Hopefully no terrible news

Let us know what they find out.

hansoac · 05-10-2011, 09:34 AM

What sucks is that I have had TERRIBLE experience with this dealer in the past. I will maintain a stern "don't f*ck it up" attitude and see where it gets me.

ChrisSlicks · 05-10-2011, 09:52 AM

The pedal shouldn't have an particular feel as it is just a potentiometer and a spring.

It would seem as though the start up tune is off due to a faulty sensor and the car is running a bit too lean. They might ask that the car be kept overnight to reproduce the problem.

hansoac · 05-10-2011, 11:27 AM

well i dropped it off at 11 as instructed, but was informed they will call me at about 2 o clock. So there i sat looking for rides back to work when finally they offered a shuttle back..the shuttle gets here and the man driving smelled heavily of alcohol...sigh

onzedge · 05-10-2011, 11:31 AM

Quote:

Originally Posted by hansoac

well i dropped it off at 11 as instructed, but was informed they will call me at about 2 o clock. So there i sat looking for rides back to work when finally they offered a shuttle back..the shuttle gets here and the man driving smelled heavily of alcohol...sigh

Report that guy. No kidding.

buddahson · 05-10-2011, 11:32 AM

My car had the same stumble at about 11k miles. I pulled the air filters out and gave them a bit of a wipe down with a dry paper towel. It resolved my issues. FYI, I'm not too cheap to by new air filters, I just had an injen intake on the way already.

USMCASA · 05-10-2011, 03:54 PM

i've got 62k on the Z now and have never had this issue. make sure the dealer gets this fixed.

Csquared · 05-10-2011, 09:32 PM

I read about this too on Myg37, It's possible your throttle bodies are dirty too. Take a look.

GonGo · 05-10-2011, 09:41 PM

I had a similar issue with my car on about 29k miles. Took it to the dealer and they told me it was probably carbon residue on tb's, (mainteinance and not covered by warranty) I cleaned those up and It's starting normally again, and not dipping rpm's when idling.

my post with video:

weakstart

05-10-2011, 08:15 AM	#1 (permalink)
hansoac Enthusiast Member Join Date: Feb 2011 Location: Toledo Posts: 497 Drives: 09 370z Sport CY Rep Power: 14	Car almost stalls after start. Well, I am up to 9,700 miles on my 09' Z and am experiencing an issue that has me a bit worried. After the car sits for awhile (I can't say exactly how long because I am trying to start after it has been sitting overnight), when I press the start button, the car has no problem turning over, but once it does it starts to stumble for a few seconds and almost stalls out. The RPM's stay below one at this time..but after a few seconds the RPMS bump up to where they should be and it starts to idle no problem. I also feel like the car's throttle response just isn't what it should be. The pedal feels very heavy compared to my 350 and I know it should be more re-active than what it is. I am wondering if maybe it is a filter or injectors? However, I am not an expert when it comes to cars and am turning to you gurus for some advice! Thanks in advance.

05-10-2011, 09:52 AM	#9 (permalink)
ChrisSlicks A True Z Fanatic Join Date: Mar 2009 Location: North East Posts: 6,203 Drives: 09 370Z Sport M6 Rep Power: 653	The pedal shouldn't have an particular feel as it is just a potentiometer and a spring. It would seem as though the start up tune is off due to a faulty sensor and the car is running a bit too lean. They might ask that the car be kept overnight to reproduce the problem. __________________ Hotchkis ARB \| Stillen CAI \| Art Pipes \| Berk CBE \| Stillen AP Racing Brakes \| AE Performance Oil Cooler \| BC Racing ER Coilovers \| Doran Control Arms

05-10-2011, 11:32 AM	#12 (permalink)
buddahson Enthusiast Member Join Date: Jul 2009 Location: Boulder, CO Posts: 272 Drives: 09 370z, 07 R6 Rep Power: 15	My car had the same stumble at about 11k miles. I pulled the air filters out and gave them a bit of a wipe down with a dry paper towel. It resolved my issues. FYI, I'm not too cheap to by new air filters, I just had an injen intake on the way already. __________________ Thanks for the sig EazyD.

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05-10-2011, 08:27 AM	#2 (permalink)
Econ A True Z Fanatic Join Date: Jan 2011 Location: New York City Posts: 2,546 Drives: Fiat? Rep Power: 19	take it to the dealer. you still have warrante on it?

05-10-2011, 08:46 AM	#3 (permalink)
USMCASA A True Z Fanatic Join Date: Nov 2009 Location: NC Posts: 1,152 Drives: 09 370z CY M6 Rep Power: 17	bad gas? i'd definitely take it to the dealer asap

05-10-2011, 08:54 AM	#4 (permalink)
Econ A True Z Fanatic Join Date: Jan 2011 Location: New York City Posts: 2,546 Drives: Fiat? Rep Power: 19	especially at the 9700 mile mark... i always find that dealers give me less of a hard time pre 10k mile mark... usually no questions asked cars considered relativley "new"

05-10-2011, 09:21 AM	#5 (permalink)
kenchan A True Z Fanatic Join Date: Aug 2009 Location: N/A Posts: 76,801 Drives: N/A Rep Power: 141520	yah, it could be a number of things, just take it to the dealer for the time being.

05-10-2011, 09:32 AM	#6 (permalink)
hansoac Enthusiast Member Join Date: Feb 2011 Location: Toledo Posts: 497 Drives: 09 370z Sport CY Rep Power: 14	Ok. I have an appointment scheduled for 11! Hopefully no terrible news

05-10-2011, 09:34 AM	#8 (permalink)
hansoac Enthusiast Member Join Date: Feb 2011 Location: Toledo Posts: 497 Drives: 09 370z Sport CY Rep Power: 14	What sucks is that I have had TERRIBLE experience with this dealer in the past. I will maintain a stern "don't f*ck it up" attitude and see where it gets me.

05-10-2011, 11:27 AM	#10 (permalink)
hansoac Enthusiast Member Join Date: Feb 2011 Location: Toledo Posts: 497 Drives: 09 370z Sport CY Rep Power: 14	well i dropped it off at 11 as instructed, but was informed they will call me at about 2 o clock. So there i sat looking for rides back to work when finally they offered a shuttle back..the shuttle gets here and the man driving smelled heavily of alcohol...sigh

05-10-2011, 03:54 PM	#13 (permalink)
USMCASA A True Z Fanatic Join Date: Nov 2009 Location: NC Posts: 1,152 Drives: 09 370z CY M6 Rep Power: 17	i've got 62k on the Z now and have never had this issue. make sure the dealer gets this fixed.

05-10-2011, 09:32 PM	#14 (permalink)
Csquared Enthusiast Member Join Date: Mar 2010 Location: Hong Kong Posts: 302 Drives: 09 Nissan 370z Y 7sp Rep Power: 15	I read about this too on Myg37, It's possible your throttle bodies are dirty too. Take a look.

05-10-2011, 09:41 PM	#15 (permalink)
GonGo Base Member Join Date: Mar 2009 Location: Puerto Rico Posts: 80 Drives: 2009 370z PW M6 Rep Power: 16	I had a similar issue with my car on about 29k miles. Took it to the dealer and they told me it was probably carbon residue on tb's, (mainteinance and not covered by warranty) I cleaned those up and It's starting normally again, and not dipping rpm's when idling. my post with video: weakstart