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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 10-20-2016, 07:00 AM   #1
Registered User
Join Date: Oct 2016
Location: Merseyside
Posts: 2
My Ride: E46 318i 2003
Sudden misfire

Hi all,
E46 N42 318i 2.0L Petrol UK/Euro model 2003

Firstly... I have had the piston rings and valve seals replaced on my car last week. This is the ONLY job anyone other than myself has done on my car since ive owned it.

Engine has been fine all week apart from a "waffle" noise under moderate acceleration only. I posted about this in a previous post and will be taking the car back to the garage on Saturday for them to look at.

However... This morning I stated the car and it was instantly misfiring. I haven't had chance to plug it in to INPA or EasyDIS so i cant be too specific with regards to diagnostics but i was able to do a quick generic diagnostic scan on my phone which shows P1349 which apparently relates to Cy.4.

The car has gave me NO problems at all apart from the oil burning in the last year or so, and I feel it would be a real coincidence if this was just a coil that has packed in...

I was wondering if anyone has any input on this as Im a little unsure if it could relate to the repair or if it may even tie in with the waffle noise i've been able to hear since the job was done.

Thanks in advance,
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Old 10-20-2016, 07:35 AM   #2
Registered User
Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 19,497
My Ride: 330CiC, M5, X5
Vacuum leaks and ignition problems are the most common problems that create misfires.

I would rule out vacuum leaks before I do anything else.

Smoke testing the intake is the best way to find leaks.

Search my user name and the term "smoke test" for ideas.
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
jfoj is online now   Reply With Quote

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