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Do injectors in DI engines ever get dirty? #4641903
01/21/18 12:46 PM
01/21/18 12:46 PM
Joined: Feb 2012
Posts: 22
Portland, OR
Oneill5491 Offline OP
Oneill5491  Offline OP
Joined: Feb 2012
Posts: 22
Portland, OR
I've been trying to find definitive information on whether the injectors themselves in direct injected engines ever get dirty to the point where the fuel may not be injected as a perfectly fine mist into the cylinder. I've found some that say that fuel pressure is so high in DI engines that contaminants are unable to build up on the injector tip. Is this the general consensus for all DI systems?

If the injectors have been known to get dirty, do fuel additives help?

Last edited by Oneill5491; 01/21/18 12:47 PM.
Re: Do injectors in DI engines ever get dirty? [Re: Oneill5491] #4641912
01/21/18 12:51 PM
01/21/18 12:51 PM
Joined: Mar 2009
Posts: 2,679
Cedarbrae, Ontario
xxch4osxx Offline
xxch4osxx  Offline
Joined: Mar 2009
Posts: 2,679
Cedarbrae, Ontario
Modern diesels run very high fuel pressures and can still get deposits on the tips. Using low quality gas I'm sure could cause problems in direct injection systems.


2015 RAM SXT Crew Cab 5.7 with 6 speed tranny.

2008 Mazda 3 GS Sport Hatchback 5sp MT (Girlfriend's car)

Re: Do injectors in DI engines ever get dirty? [Re: Oneill5491] #4641918
01/21/18 01:02 PM
01/21/18 01:02 PM
Joined: Nov 2004
Posts: 7,803
Texas
GMBoy Offline
GMBoy  Offline
Joined: Nov 2004
Posts: 7,803
Texas
You bring up a good question. I've got 150k on my CTS 3.6DI and all seems well. I toss in a bottle of Techron or Gumout PEA cleaner every oil change or so just as matter of course.

Re: Do injectors in DI engines ever get dirty? [Re: Oneill5491] #4641919
01/21/18 01:03 PM
01/21/18 01:03 PM
Joined: Dec 2011
Posts: 5,105
North Carolina
rooflessVW Offline
rooflessVW  Offline
Joined: Dec 2011
Posts: 5,105
North Carolina
DI injectors can and do get clogged. This is why OEMs recommend "top tier fuel."


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Re: Do injectors in DI engines ever get dirty? [Re: Oneill5491] #4641922
01/21/18 01:05 PM
01/21/18 01:05 PM
Joined: Jan 2015
Posts: 1,180
Cascadia
BikeWhisperer Offline
BikeWhisperer  Offline
Joined: Jan 2015
Posts: 1,180
Cascadia
I've seen no evidence that additional fuel injector additives are needed if you use top tier fuel regularly. My wife and I only buy top tier (mostly Chevron) and have not suffered any drivability issues in out direct injection engines over the years.

Perhaps if non top tier fuel or old gas is used, then using additional additives may be necessary.


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Re: Do injectors in DI engines ever get dirty? [Re: BikeWhisperer] #4641931
01/21/18 01:17 PM
01/21/18 01:17 PM
Joined: Aug 2008
Posts: 2,183
Cali
Malo83 Offline
Malo83  Offline
Joined: Aug 2008
Posts: 2,183
Cali
If i'm ever going on a long road trip i'll throw a bottle of GUMOUT in the tank.

Re: Do injectors in DI engines ever get dirty? [Re: Oneill5491] #4641945
01/21/18 01:31 PM
01/21/18 01:31 PM
Joined: Apr 2004
Posts: 5,242
Texas
JustinH Offline
JustinH  Offline
Joined: Apr 2004
Posts: 5,242
Texas
The book for my 11 Sonata says to use Chevron Techron every 3k miles.

I have never seen an OEM recommend fuel additive, but I have been buying injector cleaner of various brands every 3750.


'11 Hyundai Sonata GLS
'11 Scion XB
Re: Do injectors in DI engines ever get dirty? [Re: BikeWhisperer] #4641961
01/21/18 01:51 PM
01/21/18 01:51 PM
Joined: Jun 2005
Posts: 11,618
Santa Barbara, CA
bdcardinal Offline
bdcardinal  Offline
Joined: Jun 2005
Posts: 11,618
Santa Barbara, CA
Originally Posted By: BikeWhisperer
I've seen no evidence that additional fuel injector additives are needed if you use top tier fuel regularly. My wife and I only buy top tier (mostly Chevron) and have not suffered any drivability issues in out direct injection engines over the years.

Perhaps if non top tier fuel or old gas is used, then using additional additives may be necessary.


Knock on wood I have noticed this as well. I only use Shell V-Power in my Mustang and my mom only uses Shell and sometimes V-Power in her EB Fusion and we have not had any issues that I see other cars having with random misfires.


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Opinions expressed are my own.
Re: Do injectors in DI engines ever get dirty? [Re: GMBoy] #4641981
01/21/18 02:12 PM
01/21/18 02:12 PM
Joined: Feb 2014
Posts: 2,449
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Marco620 Offline
Marco620  Offline
Joined: Feb 2014
Posts: 2,449
[email protected] CZ firearm factory
PEA seems to help. I used CRC GDi throttle spray and in conjunction they work well. Highway drives are best too.


15' Civic R18 200,090k 0w20 Redline/Archoil9200/TEIN/Eibach/Injen/Tanabe Sustec/Borla Exhaust!
Going for 238,900 milestone. My house to moon is 238,900 miles!
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Re: Do injectors in DI engines ever get dirty? [Re: rooflessVW] #4642013
01/21/18 02:55 PM
01/21/18 02:55 PM
Joined: Sep 2011
Posts: 3,362
Somewhere
itguy08 Offline
itguy08  Offline
Joined: Sep 2011
Posts: 3,362
Somewhere
Originally Posted By: rooflessVW
DI injectors can and do get clogged. This is why OEMs recommend "top tier fuel."


I'd not be so quick on that - I just checked and Ford, the manufacturer with probably the most DI engines on the road (all EB's are DI) doesn't mention Top Tier Fuel in the owner's manual....

I know I use the cheapest swill in my 2 EB's and at 122k and 84k no hint of injector issues.

Re: Do injectors in DI engines ever get dirty? [Re: Oneill5491] #4642030
01/21/18 03:18 PM
01/21/18 03:18 PM
Joined: Mar 2013
Posts: 5,034
The Midwest
skyactiv Offline
skyactiv  Offline
Joined: Mar 2013
Posts: 5,034
The Midwest
I had to replace the intake manifold on my VW at 80 or 82K miles, I cant remember. The car ran perfectly fine before the intake secondaries quit opening, letting more airflow through for high RPM driving conditions. The intake valves and fuel injectors were very dirty. I cleaned everything up before putting the intake back on. The car didn't run any better other than the secondaries were functioning.

Pic of one of my injectors:




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Re: Do injectors in DI engines ever get dirty? [Re: Oneill5491] #4642133
01/21/18 05:14 PM
01/21/18 05:14 PM
Joined: Sep 2007
Posts: 346
northern NY
Driz Offline
Driz  Offline
Joined: Sep 2007
Posts: 346
northern NY
I can only speak for Hyundaiís here but they do have a valve that needs spraying supposedly around 50 K miles . You just push aside the rubber on the intake slip the straw in and spray while itís running. Itís some sort of power valve that you canít get at. That getting crusty as they can do will seriously inhibit your acceleration. You get the stuff even at Wallymart by the spray oils
I canít say all DI engines have them . I do know the infamous Hyundai Theta series engines has this supposed need.

Re: Do injectors in DI engines ever get dirty? [Re: Oneill5491] #4642164
01/21/18 05:52 PM
01/21/18 05:52 PM
Joined: Nov 2006
Posts: 20,574
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,574
MA, Mittelfranken.de
They sure do, I do them all the time. PEA cleaners help but I notice something else happening to them when they get higher miles on them.
The filters are burned out leaving only the metal ring and no filter. I found this on a few Mazda and VW/Audi injectors, the injectors were partially clogged with burned plastic filter material so no amount of cleaner is fixing that.
The good thing is that cleaning them and reverse flushing them cleans it out successfully.


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