Fuel injector cleaning
 

Hi,

I have some planned maintenance work coming up, I need to do the valve stems seals as well as a whole sealing and hose replacement. Hopefully this all goes well but I've been reading about fuel injector rebuilds, I can't seem to find kits for this. I was wondering if anyone has done this and can give me some recommendations/advice and perhaps their experience with kits they may have used. I have a 06 4.8is with 90K, thank you in advance.

Greg

I have taken fuel injectors out physically and used carb cleaner to cycle through the injector while operating/cycling the solenoid.

I'm not sure what you mean exactly by "injector rebuild kits."

I've seen fuel injector rebuild kits that have o-rings, spacers, a small filter and a cap on the fuel delivery side that you can replace when you have the fuel injectors out. Has anyone installed one of these kits and is there a recommended version?

Oh gotcha. If you want to go to that extent, they do have fuel injector refurbishers that flow match ever single injector.

This is the method I've done in the past on mine. I like that I can reverse flow the fuel injector easily. This would help if there are truly any debris captured in the fuel injector screen.

https://www.youtube.com/watch?v=7aT4S1lIBAY

everything you are asking REGARDING INJECTOR CLEANING
https://www.bimmerforums.com/forum/s...-new-injectors

Cleaning injectors is a simple process with the right tools and process. Replacing outer seals is as simple as any other O ring replacement. The real trick is measuring output, ultrasonic cleaning, replacing all the basket filters and retesting the flow against OE specs and your baseline before cleaning. Like mentioned, if your injectors are clean, (pintles and filters) then a simple gasket replacement is all that is required. In a previous life I sold the testing, cleaning and measuring machines and chemicals. Leaking ones are the most impressive when tested under pressure.

Recommendations: Many buyers of these stand alone cleaning machines will do a set for you for a nominal fee. As it only take 1 hr for a full set. Check on line for Injector cleaning services. Fuel Injector Cleaning, Rebuilding, Matching and Flow Testing Service. Here is one in Charlotte: https://racecityinjector.com/

Note: Can you get injectors cleaned while on the car? Yes, see lots of comments regarding adding chemicals to the tank Techron for example, will keep them clean
There are also pro kits where you disable the fuel pump, block off the fuel lines, then pressurize the rail with a chemical like OTC 7448a cleaner with "Pro Inject-R-Kleen" Fluid.

I've seen the flow measurement system where they test and compare all injectors against eachother. But what do they do to achieve the actual balancing? E.g., to increase (or decrease?) flows as needed so they are all equal? Just curious.

Moderators, please delete the posting above

Most shops will measure flow rate at a constant pressure, ultra sound clean, retest and will provide a min +/-5% across the set. Most will flow 2%.
Race set up will give you the same or better but the difference is most controllers will adjust the dwell cycle of the injectors to match cyl to cyl balances. I will let the race engineers explain further.

Mods, delete this guy
zoeNeine https://xoutpost.com/images/statusicon/user_offline.gif
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Joins random group, just to post about unrelated stuff!:dunno:

Done. :kungfu:

Please use the Report Post button in the future. The admin/mod team isn't active on the board, but we get emails when a post is reported. :thumbup:

The method I proposed is a really good "cheap" way to just clean the injectors. The pro to taking them out of the engine/fuelrail is that you can reverse flow them. Hooking up something inline without the fuel pump running with the engine running, only "sorta" cleans them in my opinion. That method you are banking that all the debris and blockages are soluble in a solvent solution. This might be true for most debris, but I don't think for all.

Ever take a fuel filter out of a 100k+ mile car and strike it hard with gas coming out? You'll see it is very dark/brown sludge that comes out. It's basically dirt! Things of this nature cannot simply be dissolved running one way through the injector. Same type of filter element that is in the fuel injector screen.

Flow matching is very important because the DME has to guess which injector isn't flowing correctly by O2 sensor readings and timing. Then it makes adjustments to try and match everything.

I find it most satisfying to use a service because they give before and after measurements. WitchHunter Performance is my choice.

https://witchhunter.com/

That place is pretty impressive, considering what they do spending $200 to clean up the injectors is not too bad.