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#4440401 - 06/24/17 03:26 PM Why DIrect Injection is really bad!
JDMHero47 Offline


Registered: 04/18/14
Posts: 20
Loc: Boise, Idaho
When I was doing my intake manifold cleaning, I was shell-shocked by how much oil and [censored] was in the intake tracts. I'm hoping this can help future DI engine owners understand what they are facing.

I was also super-happy that my intake valves were ok because thankfully Honda back then wasn't stupid and hadn't fallen for the false promises and company greed that comes from using a single set of Direct Injectors.

FYI, if you own a Toyota with D4-S or are a lucky owner of an Audi with the 2.0T in Eastern Europe - you guys all have a set of port injectors in order to meet and beat the emissions regulations that don't allow the type of particulate emissions that DI is responsible for. Smart choice!

Pics --

The seal that faces the top of the intake manifold


Intake Manifold cover. The dark crusty stuff is the soot marking the EGR system.



Intake Manifold plenum center part. By design it catches the majority of the oil coming in from PCV system. This is 202.5k mi. of collection. It took 4 hours with Throttle body cleaner and a toothbrush to take the heat-caked oil off.


The following are each of the 6 cylinder intake ports on the engine. Just think what my intake valves would look like if the injector wasn't there to keep them clean. Based on this, I can say there's absolutely no way in [censored] a DI engine can survive for long without a 100.00% removal of all contaminants from intake air (FYI, this is impossible as of right now in production cars. An OCC is a must-have if you plan on buying a DI car.)









Edited by JDMHero47 (06/24/17 03:27 PM)

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#4440409 - 06/24/17 03:34 PM Re: Why DIrect Injection is really bad! [Re: JDMHero47]
Kamele0N Online   sick


Registered: 02/09/15
Posts: 2054
Loc: Slovenia
So Audi is assembling different 2.0 TFSi engines for the West and East europe?
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#4440418 - 06/24/17 03:43 PM Re: Why DIrect Injection is really bad! [Re: JDMHero47]
rshaw125 Offline


Registered: 08/18/04
Posts: 3259
Loc: Raleigh ,NC CSA
202k miles. Looks pretty good.
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#4440421 - 06/24/17 03:46 PM Re: Why DIrect Injection is really bad! [Re: JDMHero47]
BMWTurboDzl Offline


Registered: 04/15/10
Posts: 1823
Loc: Atlanta,GA
Uh..there are no false promises around Direct Injection. It offers superior engine performance vs port injection. Common rail diesel tech is the most obvious example.

Sure some engines have "some" build up and some early models had significant amount of it but overall it's not a big deal.
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#4440422 - 06/24/17 03:47 PM Re: Why DIrect Injection is really bad! [Re: JDMHero47]
A_Harman Offline


Registered: 10/01/10
Posts: 6921
Loc: Michigan
interesting pictures. What oil have you been running in it?
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#4440423 - 06/24/17 03:55 PM Re: Why DIrect Injection is really bad! [Re: JDMHero47]
Kool1 Offline


Registered: 01/25/13
Posts: 906
Loc: California
Some people say an oil catch can in line with the PCV valve will prevent the carbon buildup.

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#4440429 - 06/24/17 04:05 PM Re: Why DIrect Injection is really bad! [Re: Kamele0N]
Quattro Pete Offline


Registered: 10/30/02
Posts: 35897
Loc: Great Lakes
Originally Posted By: Kamele0N
So Audi is assembling different 2.0 TFSi engines for the West and East europe?

Not sure if it's an east vs west thing, but it is true that VAG is using different versions of their engines equipped with secondary port fuel injectors in order to meet emissions requirements in some countries. USA isn't one of those countries.

A side benefit of having this secondary injector is that it helps wash off the valves.
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#4440431 - 06/24/17 04:06 PM Re: Why DIrect Injection is really bad! [Re: JDMHero47]
Quattro Pete Offline


Registered: 10/30/02
Posts: 35897
Loc: Great Lakes
Originally Posted By: JDMHero47
When I was doing my intake manifold cleaning,

What engine is this? Sorry if I missed it...
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#4440453 - 06/24/17 04:41 PM Re: Why DIrect Injection is really bad! [Re: JDMHero47]
BrocLuno Offline


Registered: 09/06/15
Posts: 5528
Loc: Kalifornia Kollective
Heck, I've decided I don't even want ODBII... So all my stuff will be pre-1995 from now on smile

As some of you know, I just got a super clean 1993 F-150 extended cab 4x4 with only 83K laugh

I'll just keep looking for other early garage queens laugh
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#4440454 - 06/24/17 04:41 PM Re: Why DIrect Injection is really bad! [Re: JDMHero47]
E150GT Offline


Registered: 03/11/12
Posts: 1111
Loc: San Antonio, TX
I don't think you can make a blanket statement like that based on your car.
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#4440468 - 06/24/17 05:05 PM Re: Why DIrect Injection is really bad! [Re: JDMHero47]
BrocLuno Offline


Registered: 09/06/15
Posts: 5528
Loc: Kalifornia Kollective
So I didn't read it in the original post, but someone mentioned 202K ... I'd say that engine looks fine for 202K smile

Sure a little clean-up will be nice, but I don't see any restricted air flow of anything smile

However, I get your point and I'm not a fan of DI. I'll stay with port injection for the foreseeable future smile
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#4440477 - 06/24/17 05:19 PM Re: Why DIrect Injection is really bad! [Re: JDMHero47]
itguy08 Offline


Registered: 09/15/11
Posts: 3227
Loc: Somewhere
202k and you're [censored] and moaning about it? Really? Seriously? It's really nothing to worry about and probably would go another 202k wothout issue.


I also call [censored] on the rest of the "you need an intake cleaning on all DI cars" nonsense. Early VW, Audi, BMW, yes. But the rest of the world has figured it out and it's not an issue. Heck, Ford probably has the most DI cars on the road and you don't hear of them really being issues. And yes those engines are getting the miles on them now (been around since late 2009).


Edited by itguy08 (06/24/17 05:21 PM)

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#4440508 - 06/24/17 06:02 PM Re: Why DIrect Injection is really bad! [Re: JDMHero47]
KL31 Offline


Registered: 06/03/16
Posts: 549
Loc: South OZ
What's this have to do with DI? Port injection looks like this after that many miles too.
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#4440515 - 06/24/17 06:17 PM Re: Why DIrect Injection is really bad! [Re: KL31]
TooManyWheels Offline


Registered: 02/21/03
Posts: 3762
Loc: Houston, Tex
Originally Posted By: KL31
What's this have to do with DI? Port injection looks like this after that many miles too.


Exactly. My Chevy 5.7 Vortec looks like this too.

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#4440519 - 06/24/17 06:25 PM Re: Why DIrect Injection is really bad! [Re: JDMHero47]
SpecM Offline


Registered: 10/08/14
Posts: 49
Loc: NC, USA
Ummmmm..... that doesnt look too bad...

This looks like a Honda J series. All but the very newest Honda Js are "regular" fuel injection. So im 95% sure this is NOT a picure of a DI issue.

What kind of car is this?

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