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#4676097 - 02/24/18 04:58 AM Direct injection, port injection, dual injection..
miden851 Offline


Registered: 02/15/16
Posts: 382
Loc: GA
...and possible problems one to be reckoned with; all explained in plain English!

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2008 Mazda6i GT; @191K miles
2016 Honda CR-V EX-L; @27K miles

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#4676105 - 02/24/18 05:26 AM Re: Direct injection, port injection, dual injection.. [Re: miden851]
demarpaint Offline


Registered: 07/03/05
Posts: 29383
Loc: NY
Interesting. Thanks for posting.
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#4676112 - 02/24/18 06:11 AM Re: Direct injection, port injection, dual injection.. [Re: miden851]
IndyFan Offline


Registered: 06/16/05
Posts: 505
Loc: Danville, Indiana
This is why I was very happy to hear that the updated Pentastar in my new Jeep JL Wrangler does not have direct injection.

On the other hand, I didn't know anything about issues with DI when I purchased my Ford Transit Ecoboost. However, when they tore my engine down after a quick oil change place ruined it by improperly installing the oil filter, the Ford dealer told me the valves actually looked pretty good. It had about 85,000 miles on it. I ran Mobil 1 EP 5w30 exclusively from the first oil change onward. A couple of OCI's went out as far as 10,000 miles, so I feel pretty good about that plan. My understanding is that Mobil 1 AP was developed moreso with turbo DI engines in mind, so I may switch to that on my new (factory rebuild) Ecoboost, and continue with 10k OCI's.

I wonder if the NOACK changes on the oil as it gets miles on it?
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#4676150 - 02/24/18 07:15 AM Re: Direct injection, port injection, dual injection.. [Re: IndyFan]
demarpaint Offline


Registered: 07/03/05
Posts: 29383
Loc: NY
Originally Posted By: IndyFan
This is why I was very happy to hear that the updated Pentastar in my new Jeep JL Wrangler does not have direct injection.



Yes! I'm hoping I can grab a new GC before they make the change to DI. Otherwise I'll wait a few years and see how the early adopters do with Chrysler's DI in the Pentastar.
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#4677922 - 02/25/18 05:30 PM Re: Direct injection, port injection, dual injection.. [Re: miden851]
miden851 Offline


Registered: 02/15/16
Posts: 382
Loc: GA
so the takeaway from the video and the overall sentiment that is out there, we should stick to the past

in my case that means I keep Mazda as long as I can, and get rid of CRV and get the one 10 years old!
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#4677949 - 02/25/18 05:54 PM Re: Direct injection, port injection, dual injection.. [Re: miden851]
Patman Offline



Registered: 05/27/02
Posts: 20253
Loc: Oakville, Ontario
I am slightly worried about the fact that my Corvette has DI but at the same time there are a few people with 2014 Corvettes out there now that are above the 60k mark and none have reported any issues at all related to DI. Hopefully once people start getting to 100k and beyond they will still have no issues. I do plan on putting at least 250k on my car.
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#4678237 - 02/25/18 10:18 PM Re: Direct injection, port injection, dual injection.. [Re: Patman]
gonefishing Offline


Registered: 10/28/11
Posts: 352
Loc: ND
Originally Posted By: Patman
I am slightly worried about the fact that my Corvette has DI but at the same time there are a few people with 2014 Corvettes out there now that are above the 60k mark and none have reported any issues at all related to DI. Hopefully once people start getting to 100k and beyond they will still have no issues. I do plan on putting at least 250k on my car.


While not the exact same motor the DI system is pretty much the same on your Corvette's LT1 as it is on my Sierra's L86. I have 115,000 miles on this vehicle with no fuel or engine issues. I do run a catch can.
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#4678889 - 02/26/18 03:45 PM Re: Direct injection, port injection, dual injection.. [Re: miden851]
Nick R Offline


Registered: 07/14/09
Posts: 11183
Loc: Albany, NY
I have 94k miles on my DI focus with no silly intake cleaning garbage, and I have no performance or economy issues of any kind related to DI. Not to say some DI engines don't have problems, but they don't all.
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#4680620 - 02/28/18 01:36 PM Re: Direct injection, port injection, dual injection.. [Re: miden851]
red7404 Offline


Registered: 01/24/18
Posts: 122
Loc: KS
that carbon build up can be fixed. with OUT taking the heads off. IMHO. with http://www.ampcolubes.com/ which lets you lubricate the intake valves with Marvel Mystery Oil. throu the intake track. IMHO.

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#4680624 - 02/28/18 01:40 PM Re: Direct injection, port injection, dual injection.. [Re: red7404]
Nick R Offline


Registered: 07/14/09
Posts: 11183
Loc: Albany, NY
Originally Posted By: red7404
that carbon build up can be fixed. with OUT taking the heads off. IMHO. with http://www.ampcolubes.com/ which lets you lubricate the intake valves with Marvel Mystery Oil. throu the intake track. IMHO.


This sounds like something that will be completely unnecessary running with normal gasoline. Maybe useful to some degree for LPG and CNG vehicles, but I highly doubt it would be worth it on a normal engine.
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#4680625 - 02/28/18 01:41 PM Re: Direct injection, port injection, dual injection.. [Re: red7404]
demarpaint Offline


Registered: 07/03/05
Posts: 29383
Loc: NY
Originally Posted By: red7404
that carbon build up can be fixed. with OUT taking the heads off. IMHO. with http://www.ampcolubes.com/ which lets you lubricate the intake valves with Marvel Mystery Oil. throu the intake track. IMHO.

A good old inverse oiler. I mentioned it years ago, when the DI problem threads first started popping up. I took some heat, my bet is it would work, or help a great deal. I'd plumb one in if I had a vehicle with a DI engine that was prone to carbon build up problems.
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#4681482 - 03/01/18 12:18 PM Re: Direct injection, port injection, dual injection.. [Re: miden851]
red7404 Offline


Registered: 01/24/18
Posts: 122
Loc: KS
NICK. normal gasoline IS the problem. it has NO lube. be cause of the ethanol. where else does the car maker have steel to steel with NO lube. just talk to some one that has a ford ecobost engine. some time ago, the ONLY fix for the carbon build up that ford had was to remove the head a scrap the carbon. i would be VERY VERY embarest to put out a product like that

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#4681498 - 03/01/18 12:42 PM Re: Direct injection, port injection, dual injection.. [Re: miden851]
dblshock Offline


Registered: 04/24/07
Posts: 2591
Loc: WI.
30k on my 1.5T without issue..constant juiced fuel and 0/40 motor oil, fingers crossed.
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#4681539 - 03/01/18 02:06 PM Re: Direct injection, port injection, dual injection.. [Re: red7404]
Nick R Offline


Registered: 07/14/09
Posts: 11183
Loc: Albany, NY
Originally Posted By: red7404
NICK. normal gasoline IS the problem. it has NO lube. be cause of the ethanol. where else does the car maker have steel to steel with NO lube. just talk to some one that has a ford ecobost engine. some time ago, the ONLY fix for the carbon build up that ford had was to remove the head a scrap the carbon. i would be VERY VERY embarest to put out a product like that


Man I'm sure glad you told me that normal gasoline has no lubrication properties and my engine is going to explode while it's new... Oh wait, I actually have 94k miles on my direct injected 2.0L from Ford and it runs perfectly, all on regular 10% ethanol gasoline. Try again with the FUD.
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2013 Ford Focus SE 2.0L/94,000miles/Valvoline Maxlife Blend 5W-20/Monro Filter

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#4681560 - 03/01/18 02:36 PM Re: Direct injection, port injection, dual injection.. [Re: miden851]
KrisZ Online   happy


Registered: 12/23/06
Posts: 7273
Loc: Toronto, Canada
DI engines have different valve seat material which is much harder. Similar to factory CNG vehicles. They don't need any lubrication.
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