Many. GenV small blocks, BMW, Subaru, Toyota just to name a few. The injector is angled to deal with carbon and increase cooling.
Got To Be Careful Shoping for Used Cars with 1st Gen GDI
- Thread starter Stumpy
- Start date
I don't know of any decent shop who will work that cheaply around here -- or in any major city.
This is one of the best Euro shops around buddy. I'll get another quote from another one a buddy runs that is top-notch.
He quoted 3 hours intake manifold + 30 min/cylinder - his is at ~$950 OTD. He is $165/hour. My shop I believe is a bit less/hour which jives with what I paid. I am a prefered customer at my shop and certainly may have gotten a bit of a break, but they are a top-end Euro shop and are never the cheapest in town here and I've never felt like I was getting cut a deal on pricing in the years I've been using them.
How is the injector cleaning the back of the valve regardless of angle when it's in the cylinder and the valve is closed when it fires?
Can you please provide some links to intake runner deposits on a Mazda CX-5 or Mazda 3 or Mazda 6 2.5 engine from 2013 through 2016?
I have never heard of or seen this before, and my searches of Youtube and Google don't come up with any results.
The intake valve is open on the intake stroke.
I guess I'm struggling here - DI has an injector in the cylinder. Intake valve opens to suck in the air but the fuel comes from the injector, fuel isn't shooting out into the intake manifold runners that I understand. DI cars all will build some level of carbon goop on the intake valves over time due to this. The only sure fire way around it that I know is 1) port injection in conjunction with the DI or 2) meth injection into the throttle body.
On engines like the genv small block the intake valve is in the path of the injector on the intake stroke. The intake stroke is when the injector sprays.
Ok got it, this is not how the VW/Euro turbo 4 bangers are set up to my knowledge.
Yeah, many of the ones susceptible to the deposits have the injector oriented towards the wall or piston face. So little to no cleaning, plus more mixing of the fuel and oil for LPSI at the ringland.
I dont find a whole bunch of Skyactiv engines in the junkyards I go to, a few here and there but not too many. The ones I have found that didnt have intake manifolds on them, exposing the valves, didnt really show any more buildup than any other engine I've seen.
I've googled the issue before, seems like most threads are from Reddit, and that place being a virtual nuthouse of insanity, I take whatever I read there with a grain of salt.
My friend is the head of maintenance at the Mazda dealer I buy from, I'll ask him about it.
A bottle of this thru the intake at every, or every other oil change, and there will be no deposits on the intake valves.
I used this on my son's Focus...man made some smoke and racket when I drove it!!!
Using variable valve timing, you can "backwash" intake valves during the compression stroke without an intake injector. Ford patented it almost 20 years ago.
https://patents.google.com/patent/US7137377B2/en
We have a 2013 CX-5 with the 2.0 skyactive without any engine buildup problems.
https://patents.google.com/patent/US7137377B2/en
We have a 2013 CX-5 with the 2.0 skyactive without any engine buildup problems.
As I've said most people running DI aren't having issues...it's a BITOG boogieman. DI is old tech at this point.
Out of the 5 cars run in our family, 3 are direct injection and two of those are twin turbo direct injection. A few early direct injection engines definitely had buildup problems. Dual injection, while also cleaning valves, is mainly for efficiency during times when direct injection isn't ideal (cold starts for example).
It sounds like we agree on the number of hours - 3 hrs plus .5/cyl. The difference is $165/hr vs $250-ish around here.
No one charges $165/hr around here.
It is not exactly bulletproof. The J35Z 3.5L V/6 engine used in the 2nd Gen RDX has the failing connecting rod bearing problem from 2016-2020. On all 2nd Gen year models it also has VCM and it's multiple inherent problems, as well as the oil leak problem that will lunch alternators and engine mounts (both are very expensive on Acuras).
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