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General E46 Forum
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Old 03-27-2016, 05:25 PM   #1
FL.325.Ci
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Got the Codes read at autozone.....

"all you need is a tune up"

"can i have the print out please?" -Walks out door

So I got the codes read and here they are, the suggested action from their computer is to replace the fuel filter.....but Id like to post and hear some thoughts first.

As follows:

-p1342 - misfire during start cylinder 1
-p0300 - random/multiple misfire detected
-p0171 - system too lean bank 1
-p0174 - system too lean bank 2
-p1349 - misfire cylinder 4 with fuel cut-off
-p1346 - misfire during start cylinder 3
-p1351 - misfire cylinder 5 with fuel cut-off
-p1344 - random/multiple misfire detected

alright, hit me with the good news
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Old 03-27-2016, 05:28 PM   #2
AndreBXP
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You have a vacuum leak somewhere....

Read this over: http://forum.e46fanatics.com/showthread.php?t=897616
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Old 03-27-2016, 06:08 PM   #3
BaliDawg
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Quote:
Originally Posted by AndreBXP View Post
You have a vacuum leak somewhere....

Read this over: http://forum.e46fanatics.com/showthread.php?t=897616
A lean condition can also be a failing fuel pump, clogged fuel filter, or some other fuel restriction problem.

Suggest to do a thorough smoke test to find vacuum leaks and test the fuel pressure at the front of the fuel rail.
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Old 03-27-2016, 06:18 PM   #4
FL.325.Ci
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Can do.

Thank you for the timely responses
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Old 03-27-2016, 07:11 PM   #5
austine46
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Quote:
Originally Posted by FL.325.Ci View Post
"all you need is a tune up"

"can i have the print out please?" -Walks out door

So I got the codes read and here they are, the suggested action from their computer is to replace the fuel filter.....but Id like to post and hear some thoughts first.

As follows:

-p1342 - misfire during start cylinder 1
-p0300 - random/multiple misfire detected
-p0171 - system too lean bank 1
-p0174 - system too lean bank 2
-p1349 - misfire cylinder 4 with fuel cut-off
-p1346 - misfire during start cylinder 3
-p1351 - misfire cylinder 5 with fuel cut-off
-p1344 - random/multiple misfire detected

alright, hit me with the good news
Im gonna shotgun these first as they should be done anyways.
New rubber boots.
injectors for misfire with fuel cut off
coils/sparks
and+1 for balidawg on the fuel pump/filter etc.
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Old 03-27-2016, 09:03 PM   #6
swordsman11868
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Agree with the vacuum leak but I would replace the fuel filter if you don't know its history.

After ~60k miles my filter had a bunch of black "sand" in it.
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Old 03-27-2016, 09:10 PM   #7
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Lower intake boot's elbow cracks often. Fuel filter, as said. Fuel pumps do fail 'softly' quite often.

You'd have seen performance degrade slowly if it's fuel filter, probably...so air leak is the best guess.

Try unplugging your MAF and seeing if that smooths things out...that forces the car to go to factory presets for fuel/air mix.
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Old 03-27-2016, 10:25 PM   #8
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FORGET the coils and injectors, these are not your problem.

Fuel filter should be replaced, but this will not be the cause of your symptoms, it may just aggravate them.

Vacuum leaks and fuel pump are the most likely culprits. I always replace the fuel pump before the filter, the filter is huge in these cars and is harder to replace than the fuel pump. The fuel filter RARELY leaves you stranded, the pump will leave you on the side of the road.

FORGET anything the folks at AutoZone told you, they work behind the counter for a REASON!

Read my comments in this thread - http://forum.e46fanatics.com/showthread.php?p=16727145

DO NOT replace sensors at this point, they are not the problem.

You also NEED your own OBDII App, get OBDFusion and the proper interface for your phone/tablet platform. Under $20 for Android, under $30 for iProducts.
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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

Last edited by jfoj; 03-27-2016 at 10:28 PM.
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Old 03-28-2016, 10:46 AM   #9
austine46
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Quote:
Originally Posted by jfoj View Post
FORGET the coils and injectors, these are not your problem.

Fuel filter should be replaced, but this will not be the cause of your symptoms, it may just aggravate them.

Vacuum leaks and fuel pump are the most likely culprits. I always replace the fuel pump before the filter, the filter is huge in these cars and is harder to replace than the fuel pump. The fuel filter RARELY leaves you stranded, the pump will leave you on the side of the road.

FORGET anything the folks at AutoZone told you, they work behind the counter for a REASON!

Read my comments in this thread - http://forum.e46fanatics.com/showthread.php?p=16727145

DO NOT replace sensors at this point, they are not the problem.

You also NEED your own OBDII App, get OBDFusion and the proper interface for your phone/tablet platform. Under $20 for Android, under $30 for iProducts.
+1 for jfoj, i only said coils/injectors cause i thought the fuel cut off meant bad injectors. but yes the fuel pump can and will leave you stranded, did it to me on the freeway LOL.

replacing the pump and filter now may settle the misfiring codes and work itself out,

obdfusion will dramactically help pinpoint your exact problems. read his thread for setting up graphs, etc. then post
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Old 03-28-2016, 11:36 AM   #10
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+2 for jfoj. Well, the coils and injectors could, maybe, be part of the problem, they are way down on the list. Certainly not starting places.

Using the Cheapest-is-the-most-likely school of repair, I'd start by making sure there are no vacuum leaks. The P0171 & P0174 typically point to a vac leak somewhere after the MAF. Leading the list of usual suspects is the large duct that feeds the throttle body. This hose has bellows built in so that the engine can move around separately from the rest of the car -- one end of the bellows is tied to the fender/aid cleaner, while the other is connected to the throttle body -- and the bellows gets cracks that are difficult to see, and easy to cause while working on other stuff in the area. After checking for the easy stuff that costs next to nothing, then move to the things with price tags attached.

Coils and injectors are pretty robust, and not a likely (although possible) source of trouble. These items are near the bottom of the list of usual suspects, not the top.
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Old 03-28-2016, 03:52 PM   #11
FL.325.Ci
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Thank you guys for all the responses.

I had the fuel pump replaced about 2 1/2 years ago. I think the pump should still be good, I'm going to be looking into doing the fuel filter, since I don't know how old that one is, the filter did not get done with the pump.

jfoj, I'l also be looking into the thread you have posted there, apparently (from numerous members on the forum) it is a great source of information.

Thanks again, sorry about responding so late, had some classes today.

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Old 03-30-2016, 08:32 AM   #12
jfoj
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Fuel filter will not be the problem. Vacuum leak or MAF on the top of the list with vacuum leak being where you should start first.
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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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