Carbon cleaning? - Jeep Renegade Forum
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post #1 of 16 (permalink) Old 08-05-2019, 02:13 AM Thread Starter
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Carbon cleaning?

Hey guys,
Curious...went to the mechanic they said i needed a carbon cleaning on my 3 year old rennie withe 24k miles on it. Also they suggested i used a high octane gas once a month as it has more detergents. Heard its a myth but want to see if theres any truth and if so, how do i prevent carbon buildup?
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post #2 of 16 (permalink) Old 08-05-2019, 02:38 AM
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post #3 of 16 (permalink) Old 08-05-2019, 02:55 AM
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post #4 of 16 (permalink) Old 08-05-2019, 09:11 AM
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post #5 of 16 (permalink) Old 08-05-2019, 09:32 AM
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While they are good videos, the 2.4 and 1.4T are not direct injection engines.

The only way they can tell if you need a carbon cleaning for your valves is if they started disassembling stuff in the area, or if they scoped it. If you didn't have work that involved either of them, they didn't do free investigative labor, and it's just an upsell for their various flushing/cleaning services that may actually be contrary to factory recommendations.

That being said, it's good to run gasoline with a good detergent package in it. It matters more who you buy from than what grade. Their's a program call top tier that requires a chain to use a high grade detergent package in their fuels. You cna look up what chains are on it, just google top tier fuel brands. Myself, I stop at the cheapest place on the way to work and they are not top tier. I occasionally chuck in a tank full of top tier because i fill up when at costco whoa re a top tier brand. I also would chuck in a bottle of injector cleaner about once every six months. Never had issues on my last car (it also required premium though, and premium fuels may have more detergents in general).

If you got this recommendation in conjunction with their fan recall work, be doubly suspect. I'm going to guess that given the tight space and all the plastic parts, that although book for the fan work is 1.5 hours, FCA may not be reimbursing them at full rate, or all the plastic bits and small spaces make getting under book hard, or a combination.

I know my dealer tried to upsell me to a throttle body cleaning "because it was looking real varnished in there". The 2.4l throttle body is between the engine and the firewall near the driver's a pillar. You have to pull out all sorts of stuff to get to it. They didn't do that. They didn't scope it, and likely they had no intention of doing that had I paid. They'd likely just spray a can of stuff in the intake for a minute or two and take my money. Which BTW, they wanted $475 for it. Which is INSANE. A brand new one is literally under $200 and the labor on it is maybe half an hour. That's some serious BS. While my dealer isn't usually super awesome about trying to keep costs down, they are usually more of the type to just jump to replacement that's more expensive than any given piece of doing it bit by bit, but will cost less than if the bit by bit doesn't work, saves them time, and doesn't have you come back until the next thing breaks than to outright rip you off.

They also tried to tell me FCA didn't have the parts for the fan when they did.

I'm guessing FCA is screwing the dealers on compensation for this recall.
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post #6 of 16 (permalink) Old 08-05-2019, 10:32 AM
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post #7 of 16 (permalink) Old 08-05-2019, 10:39 AM
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Quote:
Originally Posted by raz-0 View Post
While they are good videos, the 2.4 and 1.4T are not direct injection engines.
Thanks, that's good to know.
So are they Port Injection Engines?
What're thoughts on Catch Cans?

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post #8 of 16 (permalink) Old 08-05-2019, 10:49 AM
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MultiAir II, using direct fuel injection is used in the GSE (FireFly) units.

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Last edited by L A D A; 08-05-2019 at 10:53 AM.
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post #9 of 16 (permalink) Old 08-05-2019, 12:08 PM
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Quote:
Originally Posted by L A D A View Post
MultiAir II, using direct fuel injection is used in the GSE (FireFly) units.
Yes the firefly with DGI is the 1.3l firefly unit on new 2019 renegades.


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post #10 of 16 (permalink) Old 08-05-2019, 03:49 PM
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quality gas and a good high speed, pedal to the metal ride for about 50 miles
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