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General E46 Forum
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Old 02-20-2016, 10:36 AM   #1
DEADF15H
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P0303, P0171,P0174 Codes

P0303, P0171,P0174 Codes, P0305,has come up recently, but cleared. 303 and 305 are apparently a misfire on cylinders 3 and 5.
See screen shot

Logging will be attached, The files are showing on my phone in DropBox, but not when accessing the account through my computer. Having to send them to computer from phone via email, then posting.
Also have a P01350 a few weeks ago, but it hasn't returned.

01 325i Sedan Auto, 168,000 miles.

Below is a list of what's been recently done, that I thought would be pertinent to the situation. Excludes cooling overhaul, suspension PM, interior, etc.....
For the most part, I use OE or OEM parts for anything with an electric current going to it or a vacuum.

PMs Completed
.
If there were issues prior to the PM they were resolved by the PM, (no lingering codes). In most cases, I was going down the Mango or jfoj list and paying attention to parts that were starting to look shabby.

New Bosch pre cat 02 Sensors due to codes 10/14/15
VDO fuel pump, Gasket, OE fuel filter, new Relay, all soft hoses and clamps, as a PM 03/15/16 (per jfoj's method)
Intake and Exhaust Camshaft Positions Sensor, last month
Cold Weather CCV in last year, as a PM, including dipstick 0-ring
TerraClean Decarburization and Injector Service as a PM 07/09/14, car was in the shop for a left axel replace and I had read up on it after seeing it on 2 TV shows, so had it done for $100.
ICV and throttle body inspected and cleaned (not the back side of the throttle body) during CCV Kit PM.
DISA inspect and new gasket during CCV PM, banjo bolt got new washers, seemed perfect.
FSR 3 years old, OEM
SAP REIN Pressure Hose Assy replaced when I changed out the rubberized bolts the SAP sits on, as a PM.
Air Filter cleaned 12/4/16, was very clean, so I just blew it off with an air hose.
Intake boots replaced late 2014
New gas filler and oil caps in last 4 months
New battery last month.

Not yet completed Supension, drive train and differential issues took precedent, I'm not ignoring them, just haven't had time to do it all.
Spark Plugs (unknown) Next on the list
Voltage Regulator (unknown)
Brake Booster (unknown)
MAF (unknown) I cleaned it with MAF cleaner at least 6 months ago when I had it out, probable didn't do much, but whatever, had it handy.
Injectors (unknown)

Files attached:
Diagnostic Screenshot
PID Screenshot
#1 Log is overnight cold startup
#2 Log is warm idle
#3 Log is 65 mph on warm engine
#4 is unknown.
Attached Thumbnails
Click image for larger version

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Attached Files
File Type: pdf OBD 2 Instructions from jfoj.pdf (116.5 KB, 47 views)

Last edited by DEADF15H; 02-20-2016 at 12:30 PM.
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Old 02-20-2016, 10:40 AM   #2
DEADF15H
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Attempting to load the Logging files.
Dropbox doesn't play well, when copying and pasting the URL


#1 https://www.dropbox.com/s/7ytgo8i0r5...04635.csv?dl=0

#2 https://www.dropbox.com/s/vtwcrbujq6...11823.csv?dl=0

#3 https://www.dropbox.com/s/h9zws8ubs4...12552.csv?dl=0

Last edited by DEADF15H; 02-20-2016 at 11:55 AM.
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Old 02-20-2016, 10:56 AM   #3
markusmarkus
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P0171/0174 are classic codes for vacuum leaks. Have the intake smoke tested.
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Old 02-20-2016, 12:04 PM   #4
DEADF15H
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Thank you Markus, I was afraid of that. I'll have to find the link where jfoj gave info on a Ford oil filler cap that you drill a hole in, and can pick up at AutoZone or Advance.
Once I learn what to look for for the P0303 and P0305 (unless they are linked), I'll make a trip to town, to pick up the needed supplies. Just moved back to the country after living in a major metro for 30 years, forgot every trip into town is a 1 hour time bandit.
I'll do a quick visual on the SAP hose I PM replaced recently, just because I didn't have history on it, it looked and felt weak, and I was changing out those goofy rubber coated bolts that hold it to the bracket. Maybe it's worked it's way loose or something. No codes until now.

Last edited by DEADF15H; 02-20-2016 at 12:11 PM.
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Old 02-20-2016, 01:32 PM   #5
dslboomer
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If it was truly warmed up engine, coolant temperature was lower than should be. It should be 94 to 95 Celsius. Looks like thermostat needs to be changed.
Both banks LTFT are high causing P0171 and P0174.
I don't see the log for warm idle which will give some idea about the condition of MAF.
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Old 02-20-2016, 02:05 PM   #6
DEADF15H
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Thanks dslbloomer, I'm getting ready to go out and do the 3 step logging procedure again.
#1 Log is overnight cold startup
#2 Log is warm idle
#3 Log is 65 mph on warm engine

That's a valid point. I'm pretty sure the buffered dash gauge was straight up, before I ran the #2 log. I know I've run the car lately with ODB Fusions dashboard Engine Temp guage, and thought it was on target. But obviously something is amiss.
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Old 02-20-2016, 07:52 PM   #7
DEADF15H
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#1 https://www.dropbox.com/s/h9zws8ubs4...12552.csv?dl=0

#2 [url]https://www.dropbox.com/s/4inve48r3t1s9ky/CSVLog_20160220_162205.csv?dl=0[url]

#3 https://db.tt/IeOIZQJ9

Last edited by DEADF15H; 02-25-2016 at 09:43 AM.
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Old 02-20-2016, 08:41 PM   #8
dslboomer
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Quote:
Originally Posted by DEADF15H View Post
#1 https://www.dropbox.com/s/h9zws8ubs4...12552.csv?dl=0

#2 [url]https://www.dropbox.com/s/4inve48r3t1s9ky/CSVLog_20160220_162205.csv?dl=0[url]
Coolant temperature is 90, so it is better than before but not ideal yet. You may want to keep an eye on it.

At idle,
Average rpm: 699, rpm range = 15. Very stable and good.
MAF reading average = 2.85 g/s.
This reading is compatible (4.3% higher) to STM Suspenion's (2.5 liter) brand new MAF reading of 2.73g/s in the post #67 in this thread.

http://forum.e46fanatics.com/showthr...1094504&page=4

I recommend to do through smoke test looking for vacuum leaks.
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Old 02-20-2016, 08:53 PM   #9
DEADF15H
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Thanks, I'll do that. Having trouble with DropBox and couldn't load the #3 file.

Last edited by DEADF15H; 02-20-2016 at 08:55 PM.
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Old 02-20-2016, 08:59 PM   #10
dslboomer
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Quote:
Originally Posted by DEADF15H View Post
Thanks, I'll do that. Having trouble with DropBox and couldn't load the #3 file.
Check fuel pressure also.
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Old 02-21-2016, 09:07 AM   #11
markusmarkus
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The thermostat is going bad. The coolant temp needs to be between 95*C and 100*C for the engine to operate properly.
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Old 02-21-2016, 09:32 PM   #12
dslboomer
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Quote:
Originally Posted by dslboomer View Post
Coolant temperature is 90, so it is better than before but not ideal yet. You may want to keep an eye on it.

At idle,
Average rpm: 699, rpm range = 15. Very stable and good.
MAF reading average = 2.85 g/s.
This reading is compatible (4.3% higher) to STM Suspenion's (2.5 liter) brand new MAF reading of 2.73g/s in the post #67 in this thread.

http://forum.e46fanatics.com/showthr...1094504&page=4

I recommend to do through smoke test looking for vacuum leaks.
Your MAF may not be clear yet until some one with 2.5L can confirm with their measurement for MAF and LTFT.
I noticed that 'STM suspension' lives in mile high city, and thin air may impact the MAF reading.

Last edited by dslboomer; 02-21-2016 at 09:45 PM.
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Old 03-02-2016, 08:09 PM   #13
DEADF15H
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Replaced the MAF with an OEM VDO, all codes are gone for now. Only 15 miles driven.

For anyone else looking to clear these codes, I would do a smoke test first, unless all your hoses and fittings are less than 18 months old, before buying a MAF.

Have a BMW T-stat in the trunk and waiting for a warmer day, and trying to decide what else to take care of.

Last edited by DEADF15H; 03-02-2016 at 08:38 PM.
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Old 03-02-2016, 08:13 PM   #14
jfoj
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Any improvement?

Sometimes the Fuel Trims change immediately, sometimes they need a few days or more of mixed driving to shift.
__________________
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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Old 03-02-2016, 08:39 PM   #15
DEADF15H
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Crisscrossed our posts.
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Old 03-02-2016, 08:51 PM   #16
jfoj
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Give an update in about a week, include warm idle Fuel Trim values as well.
__________________
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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Old 03-02-2016, 09:16 PM   #17
dslboomer
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Quote:
Originally Posted by DEADF15H View Post
Replaced the MAF with an OEM VDO, all codes are gone for now. Only 15 miles driven.

For anyone else looking to clear these codes, I would do a smoke test first, unless all your hoses and fittings are less than 18 months old, before buying a MAF.

Have a BMW T-stat in the trunk and waiting for a warmer day, and trying to decide what else to take care of.
That's good!
How did you decide to to get a new MAF?
STMSuspension's MAF reading was close to yours, but he was in Denver.

My estimation for normal 2.5 liter maybe around 3.0 g/s during warm idle
For reference for other fanatics with 2.5 L engine, it will be great if you get log with new MAF.

Fuel adaption (LTFT) happens pretty fast, but the key is to have warmed up engine (80 deg +) if you are monitoring change. Before engine is warmed up, DME will try to compensate the new change/fix with STFT only.
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Old 03-02-2016, 10:48 PM   #18
DEADF15H
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I've had the car for almost 4 years and 60,000 miles. I suspected the MAF was original. Talked with jfoj at length, and gave him the full history on all the engine compartment PMs that had been done. I had it budgeted to replace this year anyway, as I'm on a mission to get the car to bullet proof.
I make a lot of trips to South Florida, especially at night, hard enough to find gas after 10:00 PM, much less a parts store. So I get a little anal with the PM.

I'll post a log of warm idle tomorrow. Maybe just go ahead and do all three: cold idle, warm idle, and HWY for comparisons sake.
Then go back and do it again in a week, per jfoj's request. Should have the new T-stat in by then.

Last edited by DEADF15H; 03-04-2016 at 05:10 AM.
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Old 03-07-2016, 08:36 AM   #19
DEADF15H
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New MAF installed
Thermostat in hand, but not installed.
All Codes cleared, a couple of hundred miles driven.
New Logs from yesterday
#1 Cold Start Up https://db.tt/NKXKwEyp
#2 Warm Idle https://db.tt/NcpV5qAJ
#3 Warm Engine @ 65 mph https://db.tt/jYh5ZyXB

Engine is still running cool. I will probably install thermostat this weekend. Trying to decide what all I'm going to replace while in there, most of the cooling system has been handled due to a small accident last year, but there's no date on the expansion tank, so I may replace that and the tranny T-stat while I'm doing the T-stat.

Last edited by DEADF15H; 03-08-2016 at 09:09 AM.
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Old 04-14-2016, 12:59 PM   #20
DEADF15H
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Thermostat installed. Still running cool. Temperature will top out at 91C no matter what the length of drive is. Have driven about 1,000 miles since install. Got a little side tracked on the temp issue as the alternator had to be replaced.

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