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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N57 / M57 Turbo Diesel Discussions - 335d > E91 M57 - Cylinder 4, 5, 6 low compression



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      10-28-2024, 03:15 AM   #1
fantajuice
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E91 M57 - Cylinder 4, 5, 6 low compression

I have been chasing an issue for excessive smoking from tail pipe during idle.
'07 E91 330d, 170kW. DPF, EGR and swirl flaps off.

After replacing an injector for cylinder 6 due to poor values for compensation as shown in INPA/ISTA+, values got worse for cylinder 2 and 4 and I was told to do a compression test.

Compressions came out as follows:
Cyl 1: 260 Psi / 18 Bar
Cyl 2: 260 Psi / 18 Bar
Cyl 3: 260 Psi / 18 Bar
Cyl 4: 218 Psi / 15 Bar
Cyl 5: 160 Psi / 11 Bar
Cyl 6: 190 Psi / 13 Bar

Can anyone tell me what could be the cause and what to try before I tear apart the entire engine? The excessive smoking is obviously from the poor compression in the last 3 cylinders.

Ps. Otherwise engine runs completely fine, no misfires, not down on power, doesn't consume oil, just grayish eye burning smoke coming from the tailpipe (and only on idle).
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      10-28-2024, 09:42 AM   #2
lnxguy
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Valves.
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'09 335D
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      10-28-2024, 12:33 PM   #3
335dlci
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Leak down done?
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      Today, 03:29 AM   #4
fantajuice
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Quote:
Originally Posted by 335dlci View Post
Leak down done?
Haven't got the tools for that. Might take it to a BMW specialist workshop.

Last edited by fantajuice; Today at 05:09 AM..
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