WTF? rough idle after refueling (new car!)

InnerDragon10 · 05-08-2014, 07:20 AM

Happened the last two times I filled up.

Brand new Nismo, less than 2k miles. Pulled into gas station with about 50 miles range left in the tank. Filled with premium gas. Started car. A second or two later, the car's struggling to maintain smooth idle?? Snaps out of it after a few seconds...

What's going on here? Anyone else experience this? I've never refilled with anything other than premium - hell, I bet I haven't refilled more than 10 times yet.. I'm not sure taking it to Nissan will do anything since they can't really replicate the problem. What you guys think?

Chan Chee Hoe · 05-08-2014, 07:40 AM

Maybe petrol got water.?/

SouthArk370Z · 05-08-2014, 07:52 AM

Weird. If it didn't recover so fast, I'd suspect bad gas. I'd get an OBD scanner and see if the computer is showing any error codes. You may need to monitor/log after you fill up. I suspect an emissions control problem (eg, bad gas cap) but not at all sure of that diagnosis.

madwi · 05-08-2014, 07:54 AM

I have never had anything like that happen to me. I'd swing by the dealership and grab a tech when its close to time to fill up and see if it happens while they are present?

big daddy · 05-08-2014, 11:05 AM

I had it happen to me when I purchased CHEAP super unleaded gas.

I know only use Exon or Shell super unleaded and it has happened again

jcosta79 · 05-08-2014, 11:12 AM

Quote:

Originally Posted by InnerDragon10

Happened the last two times I filled up.

Brand new Nismo, less than 2k miles. Pulled into gas station with about 50 miles range left in the tank. Filled with premium gas. Started car. A second or two later, the car's struggling to maintain smooth idle?? Snaps out of it after a few seconds...

What's going on here? Anyone else experience this? I've never refilled with anything other than premium - hell, I bet I haven't refilled more than 10 times yet.. I'm not sure taking it to Nissan will do anything since they can't really replicate the problem. What you guys think?

What brand of gas are you using?

kenchan · 05-08-2014, 03:37 PM

kmart gas?

InnerDragon10 · 05-09-2014, 01:27 PM

One time it was Marathon gas, the other time it was Wawa... not the most reputable but (hopefully) not as bad as walmart gas.

The other thing is it only happened the instant after I refilled, and never re-occurred while using up the tank. I'm thinking something happened with respect to bubbles in the fuel lines...? Can that happen? Or maybe some sort of vapor phenomenon from starting the car back up after being turned off for 1-2 minutes??

InnerDragon10 · 05-09-2014, 01:29 PM

In any case im going to stick to one or two gas companies for continuity sake. I like Chevron/BP the best out here in FL

jcosta79 · 05-09-2014, 01:50 PM

Quote:

Originally Posted by InnerDragon10

One time it was Marathon gas, the other time it was Wawa... not the most reputable but (hopefully) not as bad as walmart gas.

Marathon gas? Wawa?

There's the answer to your question.

Stick to the stations on this list: Top Tier Gasoline

InnerDragon10 · 05-09-2014, 01:55 PM

Yes but I feel we're attributing the initial startup to bad gas... but if it were bad gas id have problems for the entire gas tank, not just the moments after startup at the gas station, no? My existing fuel is probably still whatever I had in there before and not the 'new' gas. Somethings happening by the act of filling up or starting the engine so soon after shutting it off..
Well, only way to tell is to use 'reputable' gas and see if I still experience the same thing upon startup.

jcosta79 · 05-09-2014, 01:58 PM

Quote:

Originally Posted by InnerDragon10

Yes but I feel we're attributing the initial startup to bad gas... but if it were bad gas id have problems for the entire gas tank, not just the moments after startup at the gas station, no?

No. Because your ECU is pulling timing to compensate for the el cheapo gas to keep your engine from knocking. It's the reason why you can fill up with Regular and you wouldn't notice anything.

InnerDragon10 · 05-15-2014, 07:10 PM

Well, I filled up with Shell gas with less than 50 miles range to go, and there was no hesitation at startup.

Problem solved I guess?

kenchan · 05-15-2014, 07:13 PM

Quote:

Originally Posted by InnerDragon10

Well, I filled up with Shell gas with less than 50 miles range to go, and there was no hesitation at startup.

Problem solved I guess?

yah, probably. ive had bad gas on one of my earlier cars and it too had issues where the car would go into limp mode when i pushed it pretty hard.

i decided to head to a gas station that carried 100octane and mixed it at around half empty. that took care of it for that situation.

MacCool · 05-15-2014, 08:03 PM

Quote:

Originally Posted by InnerDragon10

I'm thinking something happened with respect to bubbles in the fuel lines...? Can that happen? Or maybe some sort of vapor phenomenon from starting the car back up after being turned off for 1-2 minutes??

Vapor lock would be pretty unusual in a fuel injected engine.

05-08-2014, 07:20 AM	#1 (permalink)
InnerDragon10 Base Member Join Date: Mar 2014 Location: USA Posts: 90 Drives: '14 Black 370Z Nismo Rep Power: 11	WTF? rough idle after refueling (new car!) Happened the last two times I filled up. Brand new Nismo, less than 2k miles. Pulled into gas station with about 50 miles range left in the tank. Filled with premium gas. Started car. A second or two later, the car's struggling to maintain smooth idle?? Snaps out of it after a few seconds... What's going on here? Anyone else experience this? I've never refilled with anything other than premium - hell, I bet I haven't refilled more than 10 times yet.. I'm not sure taking it to Nissan will do anything since they can't really replicate the problem. What you guys think?

05-08-2014, 07:52 AM	#3 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324198	Weird. If it didn't recover so fast, I'd suspect bad gas. I'd get an OBD scanner and see if the computer is showing any error codes. You may need to monitor/log after you fill up. I suspect an emissions control problem (eg, bad gas cap) but not at all sure of that diagnosis. __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

05-08-2014, 07:54 AM	#4 (permalink)
madwi A True Z Fanatic Join Date: Sep 2012 Location: West Michigan Posts: 31,410 Drives: Granma red Z Rep Power: 2684429	I have never had anything like that happen to me. I'd swing by the dealership and grab a tech when its close to time to fill up and see if it happens while they are present? Last edited by madwi; 05-08-2014 at 07:59 AM.

05-08-2014, 11:05 AM	#5 (permalink)
big daddy Enthusiast Member Join Date: Jan 2014 Location: San Antonio, Texas Posts: 290 Drives: 2013 Nismo Rep Power: 13	I had it happen to me when I purchased CHEAP super unleaded gas. I know only use Exon or Shell super unleaded and it has happened again __________________ Fast intensions Non-Resonated Test Pipes and TDX CBE w/18" Resonators, Stillen Generation 3 Long Tube CAI, tint, tail light covers, Gramlights 57Xtremes, CS Nismo kit, and several carbon parts. Slowly getting more

05-15-2014, 07:10 PM	#13 (permalink)
InnerDragon10 Base Member Join Date: Mar 2014 Location: USA Posts: 90 Drives: '14 Black 370Z Nismo Rep Power: 11	Well, I filled up with Shell gas with less than 50 miles range to go, and there was no hesitation at startup. Problem solved I guess? SterlingDrive likes this.

05-08-2014, 07:40 AM	#2 (permalink)
Chan Chee Hoe Track Member Join Date: Mar 2009 Location: Singapore Posts: 861 Drives: 370z,Yellow,7sp A Rep Power: 17	Maybe petrol got water.?/

05-08-2014, 03:37 PM	#7 (permalink)
kenchan A True Z Fanatic Join Date: Aug 2009 Location: N/A Posts: 76,801 Drives: N/A Rep Power: 141521	kmart gas?

05-09-2014, 01:27 PM	#8 (permalink)
InnerDragon10 Base Member Join Date: Mar 2014 Location: USA Posts: 90 Drives: '14 Black 370Z Nismo Rep Power: 11	One time it was Marathon gas, the other time it was Wawa... not the most reputable but (hopefully) not as bad as walmart gas. The other thing is it only happened the instant after I refilled, and never re-occurred while using up the tank. I'm thinking something happened with respect to bubbles in the fuel lines...? Can that happen? Or maybe some sort of vapor phenomenon from starting the car back up after being turned off for 1-2 minutes??

05-09-2014, 01:29 PM	#9 (permalink)
InnerDragon10 Base Member Join Date: Mar 2014 Location: USA Posts: 90 Drives: '14 Black 370Z Nismo Rep Power: 11	In any case im going to stick to one or two gas companies for continuity sake. I like Chevron/BP the best out here in FL

05-09-2014, 01:55 PM	#11 (permalink)
InnerDragon10 Base Member Join Date: Mar 2014 Location: USA Posts: 90 Drives: '14 Black 370Z Nismo Rep Power: 11	Yes but I feel we're attributing the initial startup to bad gas... but if it were bad gas id have problems for the entire gas tank, not just the moments after startup at the gas station, no? My existing fuel is probably still whatever I had in there before and not the 'new' gas. Somethings happening by the act of filling up or starting the engine so soon after shutting it off.. Well, only way to tell is to use 'reputable' gas and see if I still experience the same thing upon startup.

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