Any Direct Injected 300gt / 250gt V35's?

[Deep Dish V35]

afm plug connected?

reset throttle body?

[beercat]

Yeap. I think some gunk might have slipped through and jammed the valves. Will reopen again

[ChrisB]

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

[scotty nm35]

The VQ25det dosn't have an egr setup, not sure about the VQ37, I assume it would.

[sonicii]

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.

[scotty nm35]

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.

[sonicii]

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.

[ChrisB]

Thanks Guys,

I feel better now

[beercat]

Hmm...turns out my valves were gunked up. Sent it in to the workshop for them to remove the head (can't be bothered wth the timing chain at home)

[Deep Dish V35]

just wanting to clarify with someone on here before i tackle this job, if i make a blanking plate/gasket for this hole in the EGR will it set off a CEL? and is this the only recycling point?

[scotty nm35]

I assume it will as there is an egr temp sensor in the plenum. Try it out, if it throws a fault code you could perhaps trick the ecu with a resistor over the sensor wires...

[Deep Dish V35]

yeah was hoping the blank plate would keep the sensor operating properly so i wouldnt have to do wiring...

in that case, what spec resistor? all i know its 10a

[scotty nm35]

No idea, you would have to pull the sensor, heat it up and check. It may even need to be switched in with a relay when the egr valve opens, no big deal.

[itsRICHARD]

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

[scotty nm35]

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.

[itsRICHARD]

Having a extremely hard time taking the plenum off atm

Can't seem to remove the rubber hoses off

Edited September 1, 2012 by itsRICHARD

[Deep Dish V35]

as i am doing this clean, i am installing a plenum spacer. has anyone else done this and found the the egr no longer lines up with the upper plenum? or is it a stretch fit?

[Deep Dish V35]

^^ 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...

Edited September 4, 2012 by Deep Dish V35

[pv35gt8]

Scrape as much off as possible and scrub. Could also try using brake cleaner.

[itsRICHARD]

Mine looked similar to that, still no luck removing the plenum, also can't disconnect the battery, when I do the alarm goes off, anyone know how to solve this?