How do you know you need your valves cleaned?

RPM90 · 04-19-2012, 09:45 PM

Quote:

Originally Posted by NewYearsBoy

My car saw the Highway constantly and carbon build up was horrible.. In FL you rarely go under 45 or 50..

Short drives are just a factor in the overall issue of carbon build up, not a direct cause.

Was your engine running poorly before you found the build up?
How many miles?

RPM90 · 04-19-2012, 09:55 PM

There is another thing that people can try to help with build up, hotter plugs.
This is something that was recommended in older cars with build up.
Hotter plugs can help keep build up in check.

Hotter plugs weren't a great idea with older turbo tech as they tend to keep the comb chamber hotter overall and that could lead to greater change of detonation.
But, direct injection cools the chamber much better than non DI, and that has helped increase compression ratio. DI cools the chamber at a greater level and that could be a contributing factor to greater deposit build up as it may not get hot enough long enough to help burn off the deposits.
That's why I'm thinking a hotter plug may help with this problem, and DI will keep temps in check.

I only have about 28K miles and my 135i lease is up at the end of June.
No running problems at this mileage, and I change the oil only when the comp tells me to.

NewYearsBoy · 04-19-2012, 10:10 PM

Quote:

Originally Posted by RPM90

Short drives are just a factor in the overall issue of carbon build up, not a direct cause.

Was your engine running poorly before you found the build up?
How many miles?

No Engine problems before 12 or 15k cant remember.. But around 25 and up started seeing really bad carbon issues. Only used premium gas too.

Venom · 04-20-2012, 10:33 AM

Quote:

Originally Posted by phrenetiK

my turbos were replaced a year ago at 46,000 miles under warranty. I'm at 56,000 miles now. (replaced due to the wastegate making a ticking noise)

Ah the wastegate issue, could I get a clearer explanation on how to diagnose this? I would want to know how to tell if my turbos are bad before my warranty is up in a few months time.
Thanks,
NurEinser

phrenetiK · 04-20-2012, 10:41 AM

VERY loud ticking. you would hear it at idle with windows up. sounds like death.

Venom · 04-20-2012, 10:44 AM

Thank you!

bmw1racer · 04-20-2012, 04:14 PM

Article on direct injection and valve fouling: http://www.autoobserver.com/2011/06/...-adopters.html

bmw1racer · 04-20-2012, 05:23 PM

Do it yourself valve cleaning: http://www.n54tech.com/forums/showthread.php?t=12258

04-19-2012, 09:55 PM	#112
RPM90 Major General 890 Rep 7,047 Posts Drives: 340i M-sport AT Join Date: Mar 2006 Location: Chicago iTrader: (1)	There is another thing that people can try to help with build up, hotter plugs. This is something that was recommended in older cars with build up. Hotter plugs can help keep build up in check. Hotter plugs weren't a great idea with older turbo tech as they tend to keep the comb chamber hotter overall and that could lead to greater change of detonation. But, direct injection cools the chamber much better than non DI, and that has helped increase compression ratio. DI cools the chamber at a greater level and that could be a contributing factor to greater deposit build up as it may not get hot enough long enough to help burn off the deposits. That's why I'm thinking a hotter plug may help with this problem, and DI will keep temps in check. I only have about 28K miles and my 135i lease is up at the end of June. No running problems at this mileage, and I change the oil only when the comp tells me to.
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04-20-2012, 10:41 AM	#115
phrenetiK Banned 36 Rep 357 Posts Drives: 08 135i Join Date: Mar 2012 Location: Houston, TX iTrader: (4)	VERY loud ticking. you would hear it at idle with windows up. sounds like death.
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04-20-2012, 10:44 AM	#116
Venom Colonel 375 Rep 2,388 Posts Drives: M2 Competition Join Date: May 2011 Location: East Bay, CA iTrader: (5) Garage List 2008 BMW 135i [8.50]	Thank you!
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04-20-2012, 04:14 PM	#117
bmw1racer bimmerphile, technogeek 998 Rep 3,784 Posts Drives: 2012 E82 6MT Sport Join Date: Jun 2011 Location: SoCal iTrader: (0) Garage List 2012 BMW 128i Coupe [0.00]	Article on direct injection and valve fouling: http://www.autoobserver.com/2011/06/...-adopters.html __________________
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04-20-2012, 05:23 PM	#118
bmw1racer bimmerphile, technogeek 998 Rep 3,784 Posts Drives: 2012 E82 6MT Sport Join Date: Jun 2011 Location: SoCal iTrader: (0) Garage List 2012 BMW 128i Coupe [0.00]	Do it yourself valve cleaning: http://www.n54tech.com/forums/showthread.php?t=12258 __________________
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