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Author
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Topic: 2001 Corolla throwing codes - Fuel System Lean Condition?
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88DroptopGT
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Member # 2535
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posted
 
 
I pulled codes on a 2001 Toyota Corolla and it threw "Fuel System Lean Condition" code.
Anyone know what I need to replace? It just happened when I filled up at Costco so I'm keeping an eye on the temp/MPG on this tank.
Is it the regulator (if it even has one)?
![[Confused]](confused.gif)
Posts: 3978 | From: 707 | Registered: Mar 2003
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Joooestang66
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Member # 2828
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posted
Check for vacuum leaks. Make sure the air inlet tube is secure, squeeze all the vacuum lines and make sure none are soft and are sealing correctly.
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"Don't Drive Faster Than your Guardian Angel Can Fly..... Well My Guardian Angel Can Fly Pretty Fuc*ing Fast!!!"
Posts: 581 | From: Elk Grove | Registered: May 2003
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88DroptopGT
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Member # 2535
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posted
Thanks I'll double check those vacuum lines.
Posts: 3978 | From: 707 | Registered: Mar 2003
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88DroptopGT
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Member # 2535
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posted
It also states it being in "bank 1" or #1 cylinder so could it be the injector?
Any toyota techs out there?
Posts: 3978 | From: 707 | Registered: Mar 2003
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two-gun kid2
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Member # 5891
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posted
maybe the o2 sensor is bad,
Posts: 5566 | From: Hayward,Ca | Registered: Jul 2005
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Jimbo
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Member # 1456
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Bank 1 refers to the bank of cylinders that is running lean. In this case on a 4 cyl you only have one bank of cylinders. In addition to the vacuum leak check, might also want to check fuel pressure, the fuel filter(pluged filter could make the car run lean) and for any exhaust leaks before the O2 sensor. If all this fails might want to take it to a shop and have them test the operation of the 02 sensor. good luck
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1965 Mustang Coupe
EFI, 302ci, T-5, 3.70's.
Click for My Mustang Pics
Posts: 352 | From: Castro Valley,CA | Registered: Jun 2002
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88DroptopGT
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Member # 2535
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posted
quote:
Originally posted by Jimbo:
Bank 1 refers to the bank of cylinders that is running lean. In this case on a 4 cyl you only have one bank of cylinders. In addition to the vacuum leak check, might also want to check fuel pressure, the fuel filter(pluged filter could make the car run lean) and for any exhaust leaks before the O2 sensor. If all this fails might want to take it to a shop and have them test the operation of the 02 sensor. good luck
Yeah i realize bank #1 pertained to the #1 cylinder out of the 4.
I was thinking it could be the fuel injector. It didn't throw an o2 sensor problem (there are separate codes for that in Chilton's.)
Stupid general "lean" code. Her tank also went down in efficiency 10 miles or so total meaning something definetely isn't running right in that #1 cylinder.
Posts: 3978 | From: 707 | Registered: Mar 2003
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Jimbo
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Member # 1456
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posted
Might want to check the plug on #1 and check the resistance on the plug wire and the injector, hopefully the specs are in your Chiltons.
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1965 Mustang Coupe
EFI, 302ci, T-5, 3.70's.
Click for My Mustang Pics
Posts: 352 | From: Castro Valley,CA | Registered: Jun 2002
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cheap
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Member # 858
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posted
the loss of efficiency (and probably performance, too) will be attributed to the engine's computer kicking the car into a "safe rich" mode to compensate for the lean condition it is detecting. You know, to protect against detonation if you are actually running lean.
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1965 Spyder GT
Posts: 1358 | From: Maine | Registered: Feb 2002
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biggmatt
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Member # 1124
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i had the same code on my truck...i went to a couple forus and they recommened cleaning the m.a.f. sensor. solved MY problem.
Posts: 392 | From: pittsburg | Registered: Apr 2002
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88DroptopGT
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Member # 2535
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posted
quote:
Originally posted by biggmatt:
i had the same code on my truck...i went to a couple forus and they recommened cleaning the m.a.f. sensor. solved MY problem.
MMM I'll try that. Thanks!
Posts: 3978 | From: 707 | Registered: Mar 2003
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88DroptopGT
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Member # 2535
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posted
quote:
Originally posted by biggmatt:
i had the same code on my truck...i went to a couple forus and they recommened cleaning the m.a.f. sensor. solved MY problem.
Yeah I checked it out and that was the problem alright. Cleaned it and it's running great!
THANKS! ![[patriot]](graemlins/patriot.gif)
Posts: 3978 | From: 707 | Registered: Mar 2003
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1FAST89GT
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Member # 5071
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posted
is the light still on? also noticed u said right after4 a fill up. u will get that code if gas up with car running, or do not tightened cap all the way on all obd II cars. just to let ya know ![[Wink]](wink.gif)
Posts: 4915 | From: VALLEJO | Registered: May 2004
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88DroptopGT
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Member # 2535
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posted
Yeah it was the dirty MAF sensor that threw the codes.
I checked for Vacuum lines and everything else checked out.
Thanks though!
Posts: 3978 | From: 707 | Registered: Mar 2003
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