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Hello chad bob,

I just spent about an hour reading this fascinating thread and was starting to think I was going to have to undertake a big clean up on my intake. Then I readlised you say this only applies to DD engines.

Am i safe to assume that my VQ25DET will be exempt from this problem?

How about my VQ37 VVEL?

Thanks

Am i safe to assume that my VQ25DET will be exempt from this problem?

How about my VQ37 VVEL?

Thanks

The VQ25DET and VQ37HR are not direct injected engines, so they won't suffer this issue, however, the intake can still get a bit grotty and a clean won't hurt.

It has nothing to do with direct injection or not, its the egr that pumps all that exhaust soot into the plenum.

A non egr motor will still go a little black due to exhaust coming back up the runner at valve overlap and the fact the pcv is dumping into the manifold.

The 'problem' the thread is referring to was the loss of performance by the intake getting clogged with oil and soot, this 'loss of performance' doesn't occur on non-DD engines, and the VQ25DET and VQ37HR are not DD engines..

However, the intake plennum does still get dirty.

  • 3 months later...
  • 3 weeks later...

Thinking about grabbing a can of Subaru Upper Engine Cleaner for my 300gt soon, anyone know if anything will go wrong if I decide to use it now (engines at 72,000kms) before my next service (79,000kms)? I've never used this seafoam stuff before. I just watched videos and read a few forums about spraying it into the vacuum hose etc

After seeing the amount of crap inside the plenum on the VQ25DD I have here, there is no way I would be letting any of it go down into the engine. I would be removing the entire plenum and runners and cleaning them properly with carby cleaner, off the car.

Be careful not to play with the throttle plate when you clean it, you may cause high idle problems.

^^ oh and what did people use to clean it all? ive found petrol, carb cleaner, degreaser all to be ineffective. hands are black now, thats about it

what about hi pressure cleaner? or steam cleaner?

when it comes to crud factor, i think im winning...

916AF1F9-5C3A-4266-ADBD-C4B707375D26-384-0000005612EBA2D1.jpg

18021B82-1E26-46DD-A4F9-20CA769B2735-384-0000005617CCD622.jpg

825105C1-58F7-4B27-94E9-3A4A7EAECDAA-384-000000561BC6013F.jpg

C0132B18-3512-42BD-892F-6CB9268A9AE2-384-00000056211058EB.jpg

CFCB6C0D-7947-4813-8C40-95B953148464-384-00000056252261BF.jpg

D068EAFF-AF81-48CB-AFA1-DDCE34BA946E-384-000000562D17778A.jpg

Edited by Deep Dish V35

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