Cleaning out the intake manifold... anything else worth checking?

Soul_Glo · 02-27-2015, 12:55 AM

Got a can of BG Throttle Body Cleaner and figured I will do a general clean up on the weekend.

At 70k Miles now... car model/make under my user name.

So far thinking...
- Replace intake manifold gasket
- Clean out DISA valves
- Manifold itself...

Anything else worth a check or clean when down there?

Thanks

Phil325i · 02-27-2015, 02:46 AM

You're wasting your time. The problem isn't the inlet manifold, but the carbon caked to the backs of the inlet valves. And that can only be removed by walnut blasting - cleaner won't touch it.

And AFAIR, your engine doesn't have DISA valves...

Soul_Glo · 02-27-2015, 03:47 AM

It has a two stage Phil. Two DISA's and is 2.5 not 3.0.
Port injection and not direct injection so...
I think it is worth a clean as I am replacing the oil separator and breather this weekend so it might be gunked up but will have a look once in there. We'll see how I get on and report back if it was worth it...

mob17 · 03-01-2015, 04:12 AM

Walnut blasting isn't really the solution either. The carbon build up can come back pretty quickly.

I think meth is a good solution

02-27-2015, 12:55 AM	#1
Soul_Glo Major General 13346 Rep 7,484 Posts Drives: G20 Join Date: May 2013 Location: Manhattan, NYC iTrader: (1)	Cleaning out the intake manifold... anything else worth checking? Got a can of BG Throttle Body Cleaner and figured I will do a general clean up on the weekend. At 70k Miles now... car model/make under my user name. So far thinking... - Replace intake manifold gasket - Clean out DISA valves - Manifold itself... Anything else worth a check or clean when down there? Thanks
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02-27-2015, 02:46 AM	#2
Phil325i Brigadier General 615 Rep 3,194 Posts Drives: E92 325i MSport Coupe Join Date: Apr 2012 Location: UK South East iTrader: (1) Garage List 2009 BMW 325i Coupe [6.00]	You're wasting your time. The problem isn't the inlet manifold, but the carbon caked to the backs of the inlet valves. And that can only be removed by walnut blasting - cleaner won't touch it. And AFAIR, your engine doesn't have DISA valves... __________________ E92 pre-LCI 325i - Ohlins R&T; H&R spacers; M3 strut brace; Swift thrust sheets; 3 x chassis braces; diff brace; N53 V-brace; 034 subframe inserts; BMS clutch stop; BMS CDV; RE g/box mounts; Delrin shift bushes; Saikoumichi OCC; Cyba scoops; BMW Perf Exhaust; HEL s/steel brake hoses; M3 rear spoiler; Recaro Sportster CSs; M3 white dash LEDs; LED Angels; LED side repeaters; BMW Perf black grille; CSL reps; SSDD carbon diffuser; Monster Wrap black roof/clear front
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02-27-2015, 03:47 AM	#3
Soul_Glo Major General 13346 Rep 7,484 Posts Drives: G20 Join Date: May 2013 Location: Manhattan, NYC iTrader: (1)	It has a two stage Phil. Two DISA's and is 2.5 not 3.0. Port injection and not direct injection so... I think it is worth a clean as I am replacing the oil separator and breather this weekend so it might be gunked up but will have a look once in there. We'll see how I get on and report back if it was worth it...
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03-01-2015, 04:12 AM	#4
mob17 Major General 400 Rep 5,623 Posts Drives: E92 335D Join Date: Mar 2012 Location: East Midlands, UK iTrader: (5)	Walnut blasting isn't really the solution either. The carbon build up can come back pretty quickly. I think meth is a good solution
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