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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series & 4 Series > E46 (1999 - 2006)

E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 03-04-2017, 06:50 PM
CrimsonClay CrimsonClay is offline
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Location: TN
 
Join Date: Mar 2017
Posts: 3
Mein Auto: 2001 BMW 325i
Misfire, Rich, Lean....

I've been dealing with misfires on cylinder 3 and 6, rich, lean and O2 sensor codes for months now. I've replaced the following parts since December.

NGK Spark plugs
2 pre cat O2 sensors
6 Bosch fuel injectors
Bosch fuel pump
Fuel filter
Fuel pump relay
Bosch MAF


These parts have been replaced within the past 8 months.

New thermostat
New water pump
New alternator
New transmission
New CCVV


The fuel pressure is 50 psi. There r no vacuum leaks anywhere. The compression is great and there are no leak down issues in the valves. The DISA valve is not an issue either.

The car runs great when it's cold however after it warms up it just misfires. It's usually #3 misfire with fuel shut off. Today #6 misfires. We've removed the Pre cat O2 sensors to see if the cats were clogged yet that didn't resolve the issue.

I've spent thousands of dollars in labor for a reputable shop to diagnose these issues. He's finally thrown up his hands and said I'm sorry, I don't know what else to do.

Any thoughts would be greatly appreciated.
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  #2  
Old 03-08-2017, 11:57 AM
smithpatrick smithpatrick is offline
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Location: Southern New Jersey
 
Join Date: Dec 2014
Posts: 115
Mein Auto: 01 325i, 1990 325i, 320i
Question
When you remove the oil fill cap, and put your hand over the opening.
Is there any negitive pressure and how much?
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4 BMW Motorcycles R75/5, 2 R60/6, and a R90/6
5 E30's 84, 87, 3 90's
3 E36's 95 euro 320, 98 323is, and 99 328is
2 E46's 2001 325i manual, 2000 323i auto
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  #3  
Old 03-11-2017, 08:15 AM
CrimsonClay CrimsonClay is offline
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Location: TN
 
Join Date: Mar 2017
Posts: 3
Mein Auto: 2001 BMW 325i
Quote:
Originally Posted by smithpatrick View Post
Question
When you remove the oil fill cap, and put your hand over the opening.
Is there any negitive pressure and how much?
I finally got the new valve cover gasket delivered. Installed and drive it around. After returning back home, I removed the oil filter cap and put my palm over the opening. There was minimal suction and slight hange in idle speed when the car was originally started but after driving it around there is no suction and no change in idle speed after it was warm.
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  #4  
Old 03-12-2017, 08:36 AM
smithpatrick smithpatrick is offline
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Location: Southern New Jersey
 
Join Date: Dec 2014
Posts: 115
Mein Auto: 01 325i, 1990 325i, 320i
The engine wants to have a vacuum on it to keep it clear of vapors.
Some CCV have a vacuum port, try running vacuum line from the rear of the malifold to the CCV valve.
Other wise try a CCV delete, it worked for me. Called a catch can, pcv valve, hose and old fuel filter or something else.
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4 BMW Motorcycles R75/5, 2 R60/6, and a R90/6
5 E30's 84, 87, 3 90's
3 E36's 95 euro 320, 98 323is, and 99 328is
2 E46's 2001 325i manual, 2000 323i auto
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  #5  
Old 03-12-2017, 08:47 AM
CrimsonClay CrimsonClay is offline
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Location: TN
 
Join Date: Mar 2017
Posts: 3
Mein Auto: 2001 BMW 325i
I will try that today. I will say after replacing that valve cover gasket, clearing the codes and driving the car around town for an hour and a half and about 40 miles, I only got rich codes for bank 1 and 2.
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