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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Misfire Issue & Internals Upgrade Suggestion



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      04-04-2013, 10:54 AM   #1
borikangel
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Misfire Issue & Internals Upgrade Suggestion

Hi,

I got BMW 135i 09/2008 with the following FBO:

1. AA Intercooler
2. Chargepipe
3. Meth with dual nozzle
4. DCI
5. Low Temperature Thermostat
6. Nitrous w/ .0027 jet
7. AR Downpipe
8. Midpipe
9. aFe Axleback w/o muffler
10. JB

On december a misfire was presented in cylinder 3. I moved the injector to another cylinder, programmed and new oem spark plug so no more misfire after that. Then the last week i was running with another BMW and the misfire and lean mode came again on map 3. So I moved the ignition coil to another cylinder to discard the ignition coil but the issue came again in the same cylinder. Before the second issue on map 0 didn't have the issue. Now the check engine don't turn off in anyway at any maps and misfire on cylinder 2 and 3. I already verified the compression in all piston:

Firewall
6- 150psi
5- 150psi
4- 124psi
3- 92psi
2- 94psi
1- 150psi
Bumper

I don't have any white or black smoke from the exhaust or oil mixed with water.

I attached the injector and spark plug pictures from cylinder 3. The spark plug smell gas so i don't if the injector remain on or is dirty. So I sent all 6 injectors to http://www.injectorrx.com/

After i saw the compression I'm thinking about new internal upgrades like for example new pistons and/or cylinder head. I want too some recommendation according to my modifications or general modifications.
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      04-04-2013, 10:56 AM   #2
GeorgiaTech335coupe
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Not to alarm you too much, but those compression numbers would have me very, very worried. You don't want to see more than a 10% variance between cylinders.
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      04-04-2013, 10:58 AM   #3
GeorgiaTech335coupe
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Do you have access to a video scope that you can stick down the plug hole and get some pics of cylinders 2 and 3?
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      04-04-2013, 11:39 AM   #4
enrita
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Your engine is toasted... Thats exactly what happened to me but on cyl 5.
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      04-04-2013, 12:15 PM   #5
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Where those cold or warm numbers? Regardless I think the compression ring is probably toasted. Keep us updated!
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      04-05-2013, 08:49 AM   #6
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No

Quote:
Originally Posted by GeorgiaTech335coupe View Post
Do you have access to a video scope that you can stick down the plug hole and get some pics of cylinders 2 and 3?
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      04-05-2013, 08:49 AM   #7
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Quote:
Originally Posted by Cripple View Post
Where those cold or warm numbers? Regardless I think the compression ring is probably toasted. Keep us updated!
Warm numbers
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      04-05-2013, 08:55 AM   #8
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Those are unhappy compression numbers. It's probably worth doing a leak down test, but I'm afraid it will just verify the works.
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      04-05-2013, 09:46 AM   #9
ASAP
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That compression is beyond bad... i had mine tested and it was between 153-158 on all 6 cylinders. You have an internal issue.
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      04-05-2013, 02:18 PM   #10
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You need to start finding a second hand engine and stop using nos.
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      04-06-2013, 08:09 AM   #11
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Trade the car while there's still value.
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