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#1
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3.0 P0172 and P0175 codes
The service is up to date on it so was hoping you all could point me to possible causes. Any help would be much appreciated. Thanks! |
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#2
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After a little more searching just now, I seem to have found a thread with the problem solved here: http://www.xoutpost.com/bmw-sav-foru...0175-dtcs.html
I can only assume the intake boot leak is causing a lean condition and the ECU is over-compensating with fuel, as the cracks let un-metered air through, and then those cracks 'seal' up a little as the engine vibrates and moves and the ECU can't adjust back quite quick enough. Just a theory, but I will be checking my intake boot and other hoses right away! |
#3
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I had the same thing recently. Chances are the codes are wrong and it's a really running lean. You probably have a vacuum leak. Just start replacing old hoses.
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03 3.0i mt 89 325is |
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#5
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Thanks for your thoughts. I will investigate further now that I have some direction on what to look for and post my findings and outcomes in hopes of helping others.
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#6
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Why is it that when people post their trouble codes on this forum, other people will tell them that they are misinterpreting the code.
P0172 and P0175 are both Rich Codes. A rich condition is when you have too much gas in the mixture or too little air in the mixture. Too much gas could be due to the fuel pump pressure is too high. You can verify this with a fuel pressure gauge at the rail. It can also be due to a leaky injector(s). You can also verify this at the fuel rail with a fuel pressure gauge. Too little air could be due to a dirty air filter, bad maf or a bad iac valve. When did you last replace the air filter? If you have a scanner that can provide real time data, what is the airflow rate that the MAF is sending to the DME (G/S). When did you last check, service the IAC valve? Fuel trim data will verify if you have a rich or lean condition. If the trim data is negative that mean the engine is running rich. Freeze frame data will tell you as to what the engine was doing when the code(s) was set. Is the engine thermostat open so that the engine doesn't warm up so the DME is adding fuel to a cold engine. Only right way to work on these computer controlled engines is with a scanner that allows you to view real time data.
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2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD |
#7
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^I was thinking fuel system as well. Injector(s), regulator, etc. Not reaching operating temp would also cause a rich condition as upallnight mentioned.
Though, the M54 is widely known to suffer from vacuum leaks as well, just like all the BMW straight 6's. I would guess it would need to be a largish leak to cause the ECM to compensate enough to throw a rich code. Usually vacuum leaks are misfire and lean codes. Also a good idea to see if you can get live data from the X. Will help your diagnosis. I think he's said he uses Torque, which I have used in the past as well. You need to see what the fuel trims are doing as he mentioned.
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2005 X5 4.4i Build 04/05 Maintenance/Build Log Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles) 2006 X5 4.8is Build 11/05 Maintenance/Build Log Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles) 2010 X5 35d Build 02/10 Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles) Last edited by crystalworks; 09-29-2016 at 09:28 AM. |
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2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD |
#9
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Agreed. It's not an expensive app if memory serves. <$50
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2005 X5 4.4i Build 04/05 Maintenance/Build Log Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles) 2006 X5 4.8is Build 11/05 Maintenance/Build Log Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles) 2010 X5 35d Build 02/10 Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles) |
#10
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When I bought the app it was $4.99.
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2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD |
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