Fuel Injector Cleaning Results
 

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I wanted to share the fantastic results I have had over the past few years with getting my fuel injectors from different cars cleaned by RC Fuel Injection in Torrence CA. I just got my C63 injectors back and installed today and it now idles so smooth I think I could balance a nickel on the engine. My C63 has the P30 option and about 31k miles and I have occasionally used a can of Techron cleaner in the tank but doubt it does any good. The car also feels more responsive but won't be able to get it to the drag strip to see results for a month or so. I have attached the report you get from RC with before and after cleaning and it shows I also had 4 dripping injectors. I had similar results in the past with my Lexus LX450 and Viper V10 that ran much smoother after all injectors were squirting the same amount of fuel.

Great results - thanks for sharing :y

I had mine done during the summer and enjoyed similar results.

Is it worth trying fuel cleaners in the tank to clean the injectors.

How many miles when you had it done?

Are the injectors difficult to remove/install? How much did that cost to get all 8 done?

In my experience the cleaner you add to the tank is worthless once they are dirty. My car has 31k miles. The cost is $24 per injector and their web is rceng.com for details. They usually have a 24 hour turnaround and do all sorts of custom injectors for racing and modifications. If you are a wrench turner it is a simple job. If you have to ask it may not be a good project to perform without someone with more experience to help you.

Thanks, I deffinately know how to turn a wrench, just haven't had a chance to even look at my engine since I bought it. The turn around time was my next question but you beat me to it 🖒

I always thought that to be true as well. But makes you wonder if the 3000 mile recommended interval for the techron cleaner would keep them clean IF you started the using the techron on a relatively new car

I’m half way into this and you posted exactly what I am going to post.
However, because it will take me a while to do this, I bought Bosch Fuel injectors that are the proper model but not AMG marked while I get the OEM ones cleaned and ready.
Once I get the OEM cleaned and installed ill sell the Bosch if anybody is interested.

If not, I’ll alternate them, while the other set gets cleaned.

I was thinking that with these cars the injectors are clogging easy, because every chance it has it shifts into the 7th and runs 1500 RPM. Looks like they are.

The Techron works, but there are some problems:
1. Using higher concentrations than indicated (which I did with some of my previous cars) while cleaning effectively, can affect the oxygen sensors and change the gas mileage. If you do a search, you will see across many vehicles random reports of worse gas mileage after Techron. Of course nobody will admit that they used twice the concentration.
It is possible that eventually the exhaust stream may eventually clean the residue off the sensors, I’m not sure about this.

2. If you never used it and begin using it at say 50k miles, it could in theory dislodge some gunk that could get stuck in the injector and prevent it from properly closing. I’ve read of this as a theory and it was put out by injector cleaning firms, maybe it’s just ....a theory.

3. And this happened to me with my Alfa Romeo back in the late ‘90’s. If you over use the Techron like once every 3-4 tanks, you will eventually put a hole in your fuel tank.
Mine started to leak at the welded seam. I was the only one in the Alfa forum that had this problem on the 164 and I was the one using Techron the most.

So it’s powerful and it can work, but it can have downsides too.
Nice to see that the stock injectors are around 410 cc.

Sorry man, an injector cleaner in the tank doesn't even remotely touch the capability of running them through a ASNU or something similar.

For those of you on the east coast, I have used these guys in the past and they do good work and are pretty cheap - $130 for a set of 8.

http://www.hurstinjectorservice.com/

And I am not claiming it is anywhere close to a modern ultrasonic cleaning.
Not to mention the real time pattern checking and knowing for sure that you’re not going to hydro lock your engine because of a leaky injector.
That’s why I replaced with new injectors and am getting my OEM ones ultrasonic cleaned then flow tested, like the OP.
But if you can’t do this and don’t want to spend for a dealer cleaning at the fuel rail (also not as good as the ultrasonic one), then a can of Techron will do ..... something.

Brand new injectors are 90 each guys

No, they are $80 at mercedesgenuine
But if you buy Bosch fuel injectors of the proper part number but not marked AMG (and I have pictures side by side and the Bosch part number is the same on the AMG branded ones ), then the price is $28/each.

would love to see that pic and part #

Attachment 414785

The close one is the AMG one. I have these in a bag waiting for cleaning, can take more pics but you can kinda see the Bosch part number.

When I lookup the Bosch number 0280158152 it is 80 bucks, what part number are you using to find them for 28 bucks?

So for instance go to atohausaz. Go through the search pattern put in the car and year and go to injectors and you'll find the injectors for $28, now out of stock, I guess the news travelled. As far as part number, they use the Mercedes part number 156 7800 23. But then they come in boxes such as so:

Attachment 414786

Might add made in Germany too.

thanks for posting!

says it is on backorder, so maybe will be back in stock at some point http://www.autohausaz.com/search/pro...uel%20Injector

Great thread OP and an eye-opener. I've always assumed using the "best" gas (Shell, Costco, Chevron) known for the highest levels of detergents and handily exceeding Top Tier minimum levels would be enough to keep injectors at 100% efficiency but i guess not. I'll be very interested to see how mine check out particularly as I usually keep revs 25% higher in all driving conditions than what would be the norm in default full-automatic mode.

Waived my magic wand on this one

--Kyle

$23 http://www.rmeuropean.com/Products/1...023-MFG14.aspx
$29 https://www.pelicanparts.com/More_In...-078-00-23-M14

I have to tell you, the non AMG branded Bosch injectors? I am in no hurry to replace them with the AMG ones which still have to go to the injector cleaning facility.
I'm really happy with them and the car subjectively feels that it's all there stock power wise.

Are those for 30 bucks really the ones that will work on our cars?

Same part number and both sites if you put in your car in say it will fit.

good to know! I have my car dialed in and getting -3.9 and -5.9 on both banks and its staying solid on or off the throttle and I think I might have leaky injectors

hitting the dyno on Monday but want these as a backup.

PM'd you Jim but yes, I'm getting slaughtered by RM and Pelican. I've got 110k on my 6.2, flirting with the idea of changing mine even though the engine is running quite well.
--Kyle

Changed mine below 50k and it made a noticeable difference. It's because each time it can, the transmission up shifts all the way to 7 and cruises at below 2000 rpm.
That is not keeping the injectors clean and free flowing.
Also, having injectors made in 2017, may avoid problems that some of the early 156 experienced, with leaky injectors that hydrolocked the engine.
Although the Mercedes part number for the injectors did not change, Bosch May still have made changes.

As you can see the only diff is the AMG logo. And the price.

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What's the appropriate lube for the o-rings prior to install? I generally have this stuff in the toolbox and use it unless otherwise specified.

heh. My highly calibrated butt dyno says the car is running better with the new Bosch. But then compared to the stock gunked up ones anything would be an improvement! Not to open up a can of worms but wondering how many guys with pinging issues with the Eurocharged V7 tune have dirty crappy injectors. What really pushed over the edge to replace the injectors besides the PCV / intake gasket replacement was the very slight pinging I was getting with V7. Since I was pulling the intake off figured might as well just do the injectors while I had the intake off.

I just use a bit of foreplay and they usually go right in.

Oh wait what are we talking about?

Funny story - KY Jelly's support line used to be one digit off our customer service line. Some of the irate calls we would get about KY Jelly product not working in VM were real laughers. Wish I had kept some of them.

They've since changed their number so that hilarity has stopped.

:rolf:

When I did injectors on my truck the supplier recommended dish soap and water as a lube for the o rings. Not harmful to the rubber and the water evaporates when heated.

So I used gasoline. Collected some from leftovers in the rail and just dipped the o rings then it went right in.

As far as AMG vs Bosch injector spray pattern.
The Bosch part number does codify spray pattern as well.
So for a given Bosch part number, you are already mandating the spray pattern.

What AMG mandates of Bosch, I don't know.

But I'll tell you this:
EXEDY makes the clutch kit for Subaru.
You can buy the Subaru Branded one and you can buy the EXEDY branded one. The Subaru is of higher quality and doesn't judder. It had different springs in it.
However, the EXEDY part number for the Subaru sold item differs.
The STI pink injectors are improved, they have lower latency. But the part number and even the color are different.
I'm not sure that as a manufacturer, you can pump out two products with the same part number. Regardless who puts what brand on them after the fact.

It's funny how these are now double.

Hope these are still the right ones. I just made an order on pelican parts for them.
Looks like they finally dropped the price back down on them, I remember seeing them at the doubled price point.

Yeah, I notice they go up and down. Maybe depends on stock?

I've seen them at $48 on RM's site at one point.