[Z06] Mobil/Ethanol trouble codes
Thread Starter
Racer
Joined: Sep 1999
Posts: 253
Likes: 0
From: Holliston MA
Mobil/Ethanol trouble codes
I have a 2003 Z06 with a performance tune from Diablo Sport.
My check engine light just came on. The trouble codes are as follows:
P0171 Fuel trim, bank 1 system too lean
P0174 Fuel trim, bank 2 system too lean
Couldn't figure out why this would happen and then I remember my last tank of gas down Cape Cod at a Mobil station. As I was going to fill up I saw this 10% Ethanol sticker on the pump. Something I never noticed before, so I went inside and asked the owner if this was OK for a high perfomance type engine. Of course he said, Mobil couldn't sell it if it weren't ok. All Mobil gas is like this.
I just saw on the Ethanol thread that Mobil was selling this blended gas in certain markets , Boston being one of them.
Is this dangerous for a Z06 Engine?
My check engine light just came on. The trouble codes are as follows:
P0171 Fuel trim, bank 1 system too lean
P0174 Fuel trim, bank 2 system too lean
Couldn't figure out why this would happen and then I remember my last tank of gas down Cape Cod at a Mobil station. As I was going to fill up I saw this 10% Ethanol sticker on the pump. Something I never noticed before, so I went inside and asked the owner if this was OK for a high perfomance type engine. Of course he said, Mobil couldn't sell it if it weren't ok. All Mobil gas is like this.
I just saw on the Ethanol thread that Mobil was selling this blended gas in certain markets , Boston being one of them.
Is this dangerous for a Z06 Engine?
Instructor
Joined: Apr 2006
Posts: 203
Likes: 0
From: San Francisco CA
Originally Posted by Steve Zaino
I have a 2003 Z06 with a performance tune from Diablo Sport.
My check engine light just came on. The trouble codes are as follows:
P0171 Fuel trim, bank 1 system too lean
P0174 Fuel trim, bank 2 system too lean
Couldn't figure out why this would happen and then I remember my last tank of gas down Cape Cod at a Mobil station. As I was going to fill up I saw this 10% Ethanol sticker on the pump. Something I never noticed before, so I went inside and asked the owner if this was OK for a high perfomance type engine. Of course he said, Mobil couldn't sell it if it weren't ok. All Mobil gas is like this.
I just saw on the Ethanol thread that Mobil was selling this blended gas in certain markets , Boston being one of them.
Is this dangerous for a Z06 Engine?
My check engine light just came on. The trouble codes are as follows:
P0171 Fuel trim, bank 1 system too lean
P0174 Fuel trim, bank 2 system too lean
Couldn't figure out why this would happen and then I remember my last tank of gas down Cape Cod at a Mobil station. As I was going to fill up I saw this 10% Ethanol sticker on the pump. Something I never noticed before, so I went inside and asked the owner if this was OK for a high perfomance type engine. Of course he said, Mobil couldn't sell it if it weren't ok. All Mobil gas is like this.
I just saw on the Ethanol thread that Mobil was selling this blended gas in certain markets , Boston being one of them.
Is this dangerous for a Z06 Engine?
Team Owner
Joined: Mar 2005
Posts: 20,933
Likes: 905
From: salem OR
I got a tank of it in Iowa 93 premium with ethanol. Car seems to be rich
and does run as well,as with the fresh 91 octane,I get locally.They fill 5 times a week.
I buy at the highest volume station normaly, Fresh 91 is better,
is better than old 93,
ethanol sucks period.
and does run as well,as with the fresh 91 octane,I get locally.They fill 5 times a week.
I buy at the highest volume station normaly, Fresh 91 is better,
is better than old 93,
ethanol sucks period.
Safety Car
Joined: Mar 2000
Posts: 4,847
Likes: 10
From: Bartlett, IL
Cruise-In XI Veteran
St. Jude Donor '06-'07-'08-'09-'10-'11-'12
Do you have an aftermarket air intake on the car (blackwing, Vararam etc....) ???? If so this could be causing your problem, lots of owner report SES lights..... I used to get a light every week or two until I dyno tuned the car.
Thread Starter
Racer
Joined: Sep 1999
Posts: 253
Likes: 0
From: Holliston MA
Yes I installed a Halltech Stinger and I also did the ram air modification by cutting out the plastic/rubber baffle and mounting an air scoop underneath. Not to change the thread, but the Staples plastic air scoop that I have used ( if you now what I am talking about) keeps breaking. If I buy it again I am going to reinforce the leading edge with a strip of metal.
Back to gas. I have always used Mobil 93, what do others use? I would probably switch to either Shell or Sunoco.
Back to gas. I have always used Mobil 93, what do others use? I would probably switch to either Shell or Sunoco.
Burning Brakes
Joined: Apr 2003
Posts: 908
Likes: 4
From: TROY MI
[QUOTE=Steve Zaino]Yes I installed a Halltech Stinger and I also did the ram air modification by cutting out the plastic/rubber baffle and mounting an air scoop underneath. Not to change the thread, but the Staples plastic air scoop that I have used ( if you now what I am talking about) keeps breaking. If I buy it again I am going to reinforce the leading edge with a strip of metal.
Back to gas. I have always used Mobil 93, what do others use? I would probably switch to either Shell or Sunoco.[/QUOTE
All Sunoco stations here in MI. use 10% alcohol even in their 94 octane gas. I use Shell, BP and Citco.
Back to gas. I have always used Mobil 93, what do others use? I would probably switch to either Shell or Sunoco.[/QUOTE
All Sunoco stations here in MI. use 10% alcohol even in their 94 octane gas. I use Shell, BP and Citco.
Tech Contributor
Joined: Oct 1999
Posts: 41,037
Likes: 9,801
From: Charlotte, NC (formerly Endicott, NY)
10% Ethanol is required by law in all areas where they used to use MTBE to reduce emissions. It is one of the reasons Ethanol prices peaked and gas supplies got tight.
Bill
Bill
Safety Car
Joined: Mar 2000
Posts: 4,847
Likes: 10
From: Bartlett, IL
Cruise-In XI Veteran
St. Jude Donor '06-'07-'08-'09-'10-'11-'12
Originally Posted by Steve Zaino
Yes I installed a Halltech Stinger and I also did the ram air modification by cutting out the plastic/rubber baffle and mounting an air scoop underneath. Not to change the thread, but the Staples plastic air scoop that I have used ( if you now what I am talking about) keeps breaking. If I buy it again I am going to reinforce the leading edge with a strip of metal.
Back to gas. I have always used Mobil 93, what do others use? I would probably switch to either Shell or Sunoco.
Back to gas. I have always used Mobil 93, what do others use? I would probably switch to either Shell or Sunoco.
Well this would be the reason for the lean code..... most likely has nothing to do with the fuel but it may not hurt to try another station
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Race Director
Joined: Aug 2004
Posts: 14,639
Likes: 39
From: Winston-Salem North Carolina
St. Jude Donor '08-'09
I read a thread about about top tier gasoline stations. Something about the quality of the additives, since mobil/exxon wasn't on the list, I switched to Shell V-power, which was on the list. If you have a shell station nearby, try it.
Tech Contributor
Joined: Oct 1999
Posts: 41,037
Likes: 9,801
From: Charlotte, NC (formerly Endicott, NY)
That Top Tier thing is a bunch of crap. None of those suppliers exist in my area. I have been filling my cars up with Mobil for 20+ years and have never had a problem with them. As for the 10% Ethanol that is required by law as of May of this year.
Bill
Bill
Race Director
Joined: Aug 2004
Posts: 14,639
Likes: 39
From: Winston-Salem North Carolina
St. Jude Donor '08-'09
Originally Posted by Bill Dearborn
That Top Tier thing is a bunch of crap. None of those suppliers exist in my area. I have been filling my cars up with Mobil for 20+ years and have never had a problem with them. As for the 10% Ethanol that is required by law as of May of this year.
Bill
Bill
St. Jude Partner since 89
Joined: Oct 2005
Posts: 774
Likes: 4
From: Lebanon, TN
St. Jude Donor '09
Originally Posted by Bill Dearborn
That Top Tier thing is a bunch of crap. None of those suppliers exist in my area. I have been filling my cars up with Mobil for 20+ years and have never had a problem with them. As for the 10% Ethanol that is required by law as of May of this year.
Bill
Bill
Racer
Joined: Jul 2005
Posts: 427
Likes: 116
From: Coral Gables Florida
Originally Posted by Nithros
Also, it's my understanding that the government just reduced the requirements for these additives recently and the companies not on the list proceeded to reduce their usage of them to save money. We are fortunate here in Middle Tennessee to have Chevron fuel (with Techron).
All gasolines are not created equal. I'm not sure the 'premium' versus 'regular' labels traditionally used by oil companies mean too much anymore. Environmental regs imposed by tree-huggers in a host of U.S. cities and states mandate different chemical formulations thought to be more environmentally friendly in those areas, which contributes to the confusion. Part of the reason for last year's storm-related shortages was limited refining capacity for certain gasoline / additive formulations.
I've really never seen any independent verification of the performance characterisitics of gasolines produced for use around the country. I suspect meaningful differences do exist, but oil cos. and local governments would prefer to keep most consumers under-informed about the extent of such performance differences.
