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May 25th, 2008, 09:58 PM
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#1 | |
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Enthusiast
2004 Mach One
Join Date: Aug 2007
Location: Orlando, FL
Posts: 638
 iTrader: 0 reviews
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running lean
Hey guys my check engine light came on yesterday right before the dyno pulls. Damn i wish the air/fuel was hooked up.
But anyways I checked the codes and im running lean! I haven't done anything mod wise in months? A couple weeks ago I cleaned my maf/throttlebody and got a brand new air filter. What can cause me to go lean. P0171 System Too Lean - Bank No. 1. P0174 System Too Lean - Bank No. 2.
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RIP 2v 2004 4v Mach One |
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May 25th, 2008, 11:20 PM
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#2 |
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Hardcore Enthusiast
2002 Mustang GT
13.538@101.72 before cams&slicks&gears
Join Date: May 2007
Location: Indianapolis
Posts: 1,544
iTrader: 2 reviews
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MAF is usually the cause of those 2 codes together. check the wiring on the MAF, maybe it slipped off
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 Mineral Gray Club Member #2 Just your average 22 year old dumbass If you didn't build your car, and your bragging about it, STFU |
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May 25th, 2008, 11:24 PM
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#3 | |
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Admanistrator
 
Join Date: Apr 2008
Posts: 11,454
 iTrader: 1 reviews
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search this. i remember several threads like this
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MAD Stangs #8
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May 27th, 2008, 04:44 PM
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#4 |
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MM Fanatic
KB'd GT
Join Date: Nov 2006
Location: San Diego
Posts: 4,467
iTrader: 3 reviews
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If you put the maf back in a slightly different orientation it can really mess up the tune. I always mark the maf to the piping on both sides before i remove it for anything.
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May 27th, 2008, 06:21 PM
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#5 |
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Enthusiast
2001 GT
Join Date: Dec 2007
Location: Bivalve MD
Posts: 575
iTrader: 1 reviews
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I have never marked it before removing it and have experienced no problems??
not saying it couldn't though. heck nine is hanging inside the fender.
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 03 Mach 1 full eaton swap, 18" chrome bullitts, H&R springs, 5.0 shifter, slp2, mac catted H, FRP 4.10's,443 RWHP/ 386 TQ |
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Threads Similar to: running lean
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| Thread | Thread Starter | Forum | Replies | Last Post |
| Running Lean | 1982matthew | 5.0 Mustangs | 2 | April 23rd, 2008 04:01 PM |
| running lean | 91cobra5.0 | 5.0 Mustangs | 26 | January 24th, 2008 09:59 PM |
| Running Lean | ROUSHME661 | V6 Mustangs | 22 | November 30th, 2007 01:47 PM |
| RUNNING LEAN !!!! | 97MUSCLESTANG | Modular Mustangs | 6 | March 5th, 2007 09:03 AM |
| 96 GT Running Lean on both Banks | kennyvick | General Tech | 4 | September 28th, 2006 10:31 PM |
