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Old 08-19-2009, 12:32 PM   #1
RedZHP_K1
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Fixed P0171 P0174 - What I learned

I fixed my P0171 and P0174 codes and wanted to pass along what I learned. I searched around the site when I was diagnosing and it was very helpful:

When I got the codes (and rough idle), I searched for vacuum leaks and found the common one where the intake hose connects to the throttle body. The smaller hose had a tear about 1 inch long.

I replaced this part and was very happy since it was just $13.00 from the local BMW dealer. This did not fix the problem with the codes and rough idle.

I next used carb cleaner when the car was running to search for vacuum leaks. Since I had a rough idle anyway, it was not obvious when the car injected and burned some of the carb cleaner. I hooked up my scanner and watched the short term fuel trim (banks 1 and 2) when I was spraying. When I sprayed in the area of the manifold adjuster valve (DISA) the short term trim values changed by about 25%.

When I pulled out the DISA, the shaft was broken and the valve was free to move around. I got lucky - the metal pin that holds the valve to the body fell onto the garage floor when I pulled the assembly out. I just saw a recent post where somone needed a head re-build because the pin released into the engine.

The seal on the DISA was also bad. Replaced it with a new unit ($212 from dealer) and cleared the codes and all is well.

One other note - when I originally got the rough idle, the clutch made a loud clunking sound when the car was in neutral and my foot was off of the clutch. It would go away when I pressed the clutch. When I fixed the rough idle, the clutch noise went away. My guess is that the rough idle drove some vibration in the clutch/pressure plate. Maybe this is an indication that something is failing but it seems to work fine now. Any thoughts?
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Old 10-25-2009, 07:34 PM   #2
derwish
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same problem mate.. what if "I pull out the DISA and remove the flap / pin and just keep it there and plugged in"????.. Also what does DISA valve exactly DO??..:S
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Old 10-25-2009, 10:38 PM   #3
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nice post. I haven't seen many disa valves go bad, but it's certainly something to check out if I ever run into this. I have two M54's to tend to now.
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Cheat Sheet:

GT1/ISIS/MoDiC = Factory authorized diagnostic system used by BMW dealerships across the world.

NCS Expert = BMW Factory R&D programming tool available on the internet (not intended for the public and not available to the dealership network)

OEM = Genuine BMW part only available from a franchised BMW dealership.

DME = Engine Management Computer
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Old 10-25-2009, 11:31 PM   #4
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Like I said a year ago, I changed my DISA and my lean codes went away.
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Old 10-30-2009, 05:09 PM   #5
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I have these two codes just thrown along with P0313, however I do NOT have any idle/rough issues really. It will dip every once in a while when first stopped at a stop light but other than that it doesn't. I'm kind of thinking it's fuel filter. Any opinions?
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Old 10-30-2009, 07:52 PM   #6
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glad that you found your solution.
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Old 12-03-2009, 03:33 PM   #7
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I have the same problem as BMW MATT. Any opinions on what it might be?
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Old 12-03-2009, 05:18 PM   #8
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@BMWMatt and @tony330cifan: I believe P0313 is a misfire on Cyl #4. If it's accompanied by P0171 and P0174, then it's a misfire due to the lean condition. If this is your only problem, you might not have noticeably rough idle or power loss.

Your first order of business should be to check out the intake boots: The two fat rubber hoses that are directly downstream of the air filter and the MAF. The second intake boot has a smaller hose that goes to the Idle Air Control Valve (ICV); that small section of hose is notorious for decaying, cracking, and letting in unmetered air that causes the lean condition.


What does the DISA do? Read here - post #92. (danger - this link is unimaginably informative and you can waste half the day reading and learning):
http://forums.my330i.com/showthread.php?p=55148
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Old 12-03-2009, 08:27 PM   #9
Gold323Ci
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Quote:
Originally Posted by nathancarter View Post
@BMWMatt and @tony330cifan: I believe P0313 is a misfire on Cyl #4. If it's accompanied by P0171 and P0174, then it's a misfire due to the lean condition. If this is your only problem, you might not have noticeably rough idle or power loss.

Your first order of business should be to check out the intake boots: The two fat rubber hoses that are directly downstream of the air filter and the MAF. The second intake boot has a smaller hose that goes to the Idle Air Control Valve (ICV); that small section of hose is notorious for decaying, cracking, and letting in unmetered air that causes the lean condition.
I had a hole intake boot as well and replaced it. But that didn't fix my problem.

My misfire issue was a bad coil. I changed the bad coil (misfire code on cyl 1) from cylinder 1 to 2 and the code also followed. I bought a new coil on Ebay from a group in Groton, CT for about $20.

So, you may also have a bad coil that is super easy to change.
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Old 03-23-2013, 09:23 PM   #10
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Quote:
Originally Posted by RedZHP_K1 View Post
I fixed my P0171 and P0174 codes and wanted to pass along what I learned. I searched around the site when I was diagnosing and it was very helpful:

When I got the codes (and rough idle), I searched for vacuum leaks and found the common one where the intake hose connects to the throttle body. The smaller hose had a tear about 1 inch long.

I replaced this part and was very happy since it was just $13.00 from the local BMW dealer. This did not fix the problem with the codes and rough idle.

I next used carb cleaner when the car was running to search for vacuum leaks. Since I had a rough idle anyway, it was not obvious when the car injected and burned some of the carb cleaner. I hooked up my scanner and watched the short term fuel trim (banks 1 and 2) when I was spraying. When I sprayed in the area of the manifold adjuster valve (DISA) the short term trim values changed by about 25%.

When I pulled out the DISA, the shaft was broken and the valve was free to move around. I got lucky - the metal pin that holds the valve to the body fell onto the garage floor when I pulled the assembly out. I just saw a recent post where somone needed a head re-build because the pin released into the engine.

The seal on the DISA was also bad. Replaced it with a new unit ($212 from dealer) and cleared the codes and all is well.

One other note - when I originally got the rough idle, the clutch made a loud clunking sound when the car was in neutral and my foot was off of the clutch. It would go away when I pressed the clutch. When I fixed the rough idle, the clutch noise went away. My guess is that the rough idle drove some vibration in the clutch/pressure plate. Maybe this is an indication that something is failing but it seems to work fine now. Any thoughts?
Very nice. I am also wondering if only the DISA O-ring is replaced, do you think the problem would have been solved? Since you mentioned DISA leak, so I assume your DISA was working properly?
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Old 04-17-2013, 11:58 AM   #11
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I guess I need a new DISA valve.
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Old 04-17-2013, 12:00 PM   #12
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I also realized when I had my exhaust put on, that the guy didn't put in a golf tee into the vacuum hose in the rear of the car. Could this also cause this problem?
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Old 04-17-2013, 02:09 PM   #13
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Same car (well, '04 ZHP), same codes, same issue, same resolution. How many miles were on that 'ol DISA? Mine had around 70k on it, and it was pretty battered.
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Old 04-20-2013, 01:57 PM   #14
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I think it's my DISA as well but I'm afraid to replace it and still have the codes. I just crossed a 100.
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Old 04-20-2013, 02:28 PM   #15
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Fixed P0171 P0174 - What I learned

M3's don't have DISA's correct? What does the m3 use to replace this?


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Old 04-20-2013, 04:32 PM   #16
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M3 does not have DISA, they have individual throttle bodies at the intake ports and they run at higher RPM's so they do not have a replacement for the DISA.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

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Old 04-30-2013, 08:08 AM   #17
omairkhanzada
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Originally Posted by omairkhanzada View Post
I also realized when I had my exhaust put on, that the guy didn't put in a golf tee into the vacuum hose in the rear of the car. Could this also cause this problem?
Any help? I plugged it and havent driven the car in 3 weeks because I'm so busy. Just wondering if this could cause the P0171, P0174.
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Old 04-30-2013, 10:45 AM   #18
Yewzer B Lewzer
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Fixed P0171 P0174 - What I learned

Quote:
Originally Posted by omairkhanzada View Post
I think it's my DISA as well but I'm afraid to replace it and still have the codes. I just crossed a 100.
Take the DISA out and inspect it. Not difficult. Read the aforementioned link to understand how to inspect it.




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Old 04-30-2013, 09:12 PM   #19
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I've had these codes as well. I'm planning on replacing my Valve Cover Gasket soon becuase i think there may be a small vaccum leak somewhere around there. I've inspected the boots as much as i could without removing them so that will be my next step if the VCG doesn't keep the SES light off. Looks like I'll have to take another look at the DISA as well.
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Old 04-30-2013, 09:22 PM   #20
wildirish317
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For those wondering about the function of the DISA, this is a pretty good post: http://forum.e46fanatics.com/showpos...4&postcount=23
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