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Old 05-12-2015, 06:44 AM   #1
LTD36
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Join Date: Aug 2012
Location: North New Jersey
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My Ride: 05 325i and 91 MR2T
Car Shaking at First Start

Hello, I've been having the following issue with my '05 325i for a about 4 or 5 months now and I'm looking for some suggestions before I start replacing more things.

Car Info
2005 325i M54
153,XXX Miles

Problem
Starting the car when it has been sitting for more than an hour, it shakes violently and comes up with a P0303 (Cylinder 3 Misfire) and sometimes a P0304 (Cylinder 4 Misfire). Letting it idle for about 2 minutes sorts it out and it runs fine afterwards.

Things I've Already Replaced Relavent to the Issue
DISA about 2 years ago
Lower and Upper Intake Boot about 1 year ago
Air Filter about 1 year ago, it's still clean
Cleaned MAF Sensor 1 month ago
Replaced ALL Ignition Coils about 1 year ago all Bosch
Replaced Valve Cover Gasket about 1 month ago (was leaking into cyl 3 plug hole)
Spark Plugs 1 month ago
Fuel Filter 40k ago (time to replace it)

Troubleshooting Steps
I noticed the valve cover gasket leaking and also noticed that cylinder 3 had a bit of oil in it, but not a significant amount. I cleaned out all of the oil and cleaned the coil boot as well from any oil. After that I replaced all the spark plugs and the car was running smoothly for about 4 weeks and no more CEL!

However, now the issue just started up again about 3 days ago.
The only thing I can think of left is to replace the fuel filter and the fuel pump / maybe cyl 3 injector or at least send it to Witchhunter or some injector cleaning place. The reason I think that it may be fuel is the fact that when I pulled the plugs that had less than 50,000 miles on them, they were all showing signs of lean conditions, which may have caused early wear. But I don't think the 600 miles I drove in 4 weeks should have been enough to wear them all out again.

Any other suggestions before I replace the fuel pump, filter and get my injectors cleaned? I plan on doing these things anyway in the near future, but maybe I'm overlooking a simple issue.
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Old 05-12-2015, 06:58 AM   #2
jfoj
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Location: Fairfax, VA USA
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My Ride: 330CiC, M5, X5, E93
Not likely the fuel pump or filter, but should be replaced as PM at this point anyway. Fuel injectors are not likely the problem either.

Vacuum leak is likely the problem. Your symptoms are VERY common for older E46/BMW I6 engines.

Most likely the CCV, check the CCV lower oil return line first, but the entire CCV and hoses need to be replaced at this point. Crankcase air leaks are also a source of your symptoms. Everything from leaking gaskets to cracked valve covers.

Here is the info that will be useful:

You need to read the first 2 links below in my signature.

Need to see Freeze Frame info if the SES/CEL/MIL is on and Fuel Trim values at both warm idle and a steady highway cruise between 45-60 MPH.

Read this thread - http://forum.e46fanatics.com/showthread.php?t=1057387

Make ABSOLUTELY sure the O2 sensor wiring has not been mixed up, read these links:

http://forum.e46fanatics.com/showpos...0&postcount=27

http://forum.e46fanatics.com/showpos...0&postcount=26

Read my "BMW 20 Questions" comments in this thread - http://forum.e46fanatics.com/showthread.php?t=1059972

Check for or be aware of cracked valve covers:

http://forum.e46fanatics.com/showthread.php?t=1021219

http://forum.e46fanatics.com/showthr...e=2&highlight=

http://forum.e46fanatics.com/showthread.php?t=1053359

Search YouTube for Scotty Smoke Test. Do what Scotty does or build a tester from related video. Remove the oil fill cap and make sure the crankcase fills up with smoke, put the oil fill cap back on and check for leaks around the valve cover, oil fill cap, dipstick tube and CCV hoses. Cracked valve covers are pretty common on the E46 as it ages.

Note that the Scotty Smoke Test method is not so good for smaller air/vacuum leaks or fully filling the engine crankcase, for this you really need a smoke machine that can provide a solid and continuous low pressure smoke stream. So plan on building a smoke tester of you thing you will use if more than once or may have smaller and harder to find leaks.
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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; 05-12-2015 at 07:01 AM.
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Old 05-12-2015, 07:08 AM   #3
dmax
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Check your SAP system...first squeeze the hose from pump to valve (or wherever yours goes)...the 1" diameter hose leaving the pump. If it's really squishy, check it for a hole...remove exhaust side of it and see if it's left any gunk in the valve. It could be the small hose leaving the valve too, but think that's less likely as I believe it's symptoms would maintain after car is warmed up.

Also Techron is always good.

And, jfoj's comments are always good. I'm thinking SAP, though, because your symptoms stop. The SAP stops running after 2 mins. (maybe a little less).

Good luck...hth
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Old 05-12-2015, 08:01 AM   #4
jfoj
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Do not focus too much on the SAP system. Your car should have the MAF based SAP system with 2 large hoses on the pump so there is no vacuum controlled Kombi valve.

Your car has a vacuum leak, the SAP's system is only to allow for quicker O2 sensor and catalytic converter warm up and has little to no impact on cold start operation.

In the first 90 seconds of cold start the engine is typically operating on a fixed fuel enrichment Map and any additional air leakage is not corrected for. After 90 seconds the engine typically changes over to closed loop and closed loop fuel control can sometimes compensate for minor vacuum leaks and fuel distribution issues.
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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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Old 05-13-2015, 01:31 PM   #5
LTD36
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My Ride: 05 325i and 91 MR2T
Thanks for the help, guys. I'm going to give the smoke test a shot and see what leaks I can find. I did a visual once-over before when I had everything apart to check for vac leaks and also tried the brake clean method, but the smoke test seems a bit more solid. I'll report back on my findings.
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Old 05-13-2015, 01:48 PM   #6
Dave1027
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Quote:
Originally Posted by jfoj View Post
In the first 90 seconds of cold start the engine is typically operating on a fixed fuel enrichment Map and any additional air leakage is not corrected for. After 90 seconds the engine typically changes over to closed loop and closed loop fuel control can sometimes compensate for minor vacuum leaks and fuel distribution issues.
I have seen this misfire condition does not happen immediately after cold start but after about 10 to 20 seconds after. Why is that? Is the fixed mapping variable? Does it immediately start out rich and progressively get leaner like an auto choke would do?
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Old 05-13-2015, 03:11 PM   #7
jfoj
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Quote:
Originally Posted by Dave1027 View Post
I have seen this misfire condition does not happen immediately after cold start but after about 10 to 20 seconds after. Why is that? Is the fixed mapping variable? Does it immediately start out rich and progressively get leaner like an auto choke would do?
Yes, the engine starts out at a higher idle and richer fuel mixture. Then as time goes on the idle drops and the fuel mixture leans out at the point in time around 60-90 seconds that the pre-Cat O2 sensors are active enough that the SAP shuts off and then hands off to closed fuel control by the DME. The DME can then adjust/enrichen the mixture to compensate for any Lean conditions where the fixed fuel Map cannot overcome or compensate for extra air that is not measured by the MAF or is generally uncontrolled.
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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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