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Old 02-15-2017, 07:52 PM   #1
marcouvo
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Default Fuel system service

2015 A8 wet dump Stingray. 31,000 miles.

The dealer tech recommended 3-part fuel system service at 30,000 miles and noticed carbon deposits on the throttle body blade and housing.

He performed following service:

Injected pressurized solvent through fuel rail & injector nozzles, cleaned all carbon off of throttle plate and housing, and top end engine de-carbon.
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Old 02-15-2017, 08:17 PM   #2
DAC17
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Under warranty??
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Old 02-15-2017, 08:43 PM   #3
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for a direct injected engine 30k is about the norm for a fuel cleaning. I work at a hyundai / vw dealer. vw offers an additive to put in the fuel tank that's works pretty well,but you have to use it from day one to be effective. hyundai recommends every 30k and uses the three part cleaning. we charge $149.95.
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Old 02-15-2017, 10:04 PM   #4
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Is this mainly just to clean the injectors? Will not do much to clean intake valves since fuel does not flow through the valves.
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Old 02-15-2017, 10:21 PM   #5
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Default Warranty

Don't know if it's under warranty, didn't think to ask.
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Old 02-15-2017, 10:24 PM   #6
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Default Main Purpose

Not sure but the Tech mentioned ensuring the injectors spray correctly.
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Old 02-15-2017, 11:12 PM   #7
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its considered maintenance. not a warranty issue
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Old 02-16-2017, 07:58 AM   #8
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Is this really needed, my car runs and idles great. I don't care about my gas mileage.
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Old 02-16-2017, 08:57 AM   #9
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I have used Top Tier fuels for years and driven cars over 200,000 miles without any fuel system cleaning. Maybe the Wawa gasoline does this?
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Old 02-16-2017, 09:42 AM   #10
JerryU
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Quote:
Originally Posted by TEXHAWK0 View Post
Is this mainly just to clean the injectors? Will not do much to clean intake valves since fuel does not flow through the valves.
To help keep the injectors clean (and to help stop sulfur build-up on the fuel level sensor) I use the GM equivalent of Techron.
This is what is said in the 2014 Owner's Manual:
To keep fuel systems clean, TOP TIER Detergent Gasoline is
recommended.
If TOP TIER Detergent Gasoline is not available, one bottle of Fuel
System Treatment PLUS, part number 88861013, added to the fuel
tank at every engine oil change, can help. Fuel System Treatment PLUS
is the only gasoline additive recommended by General Motors.
It is available at your dealer.


Although I use Top Tier over 1/2 the time I still add this cleaner. There have been several posts about folks having to have their gas tanks removed to fix the fuel sender problem, a build up of sulfur. The Techron and GM product say they remove sulfur deposits. I recall one poster who was horrified to find they removed his drive train! Only way to get both tanks down! Another said their dealer fixed the problem with two bottles of the above mentioned GM fuel treatment. They charged $100.

Techron (no doubt IMO that is what the GM bottle contains as it looks the same and the SDS (Safety Data Sheet) says about the same and is $5 at Walmart! Cheap insurance. (Just checked the GM replacement for that part number is $12 at Amazon) Techron is a patented Chevron product and is what is in Top Tier gas.

PS: As noted by jovett below, the GM product is probably Chevron Techron Concentrate Plus, $9 on Amazon

Last edited by JerryU; 02-16-2017 at 09:37 PM.
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Old 02-16-2017, 09:50 AM   #11
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You can find Techron at Costco as well. Last time I bought it there were 6 bottles in a box for about $13-15 per box.
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Old 02-16-2017, 10:01 AM   #12
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Quote:
Originally Posted by Snowwolfe View Post
You can find Techron at Costco as well. Last time I bought it there were 6 bottles in a box for about $13-15 per box.
Perhaps their patent is running out!
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Old 02-16-2017, 11:35 AM   #13
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Direct injection engines are known for carbon build-up
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Old 02-16-2017, 11:38 AM   #14
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This is not listed in the manual as a recommended service for 30,000 miles. It will also not address possible coking on the valves. You will also be paying out of pocket for this in all likelihood. This is how dealers make money.
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Old 02-16-2017, 08:03 PM   #15
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Quote:
Originally Posted by Snowwolfe View Post
You can find Techron at Costco as well. Last time I bought it there were 6 bottles in a box for about $13-15 per box.
That's not the good stuff. You want to use Chevron Techron Concentrate Plus and it's about $10 for a bottle big enough to do 20 gallons. (they sell a smaller bottle that does 12 gallons, and sells for about $6-$7)
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