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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: DavidATL on February 09, 2019, 09:50:29 AM

Title: DIY fuel injector cleaning
Post by: DavidATL on February 09, 2019, 09:50:29 AM: I’ve had very good success cleaning injectors at home. One set for a V6 Fiero 2.8 didn’t flow at all (gummed up from sitting in a junk car for ?? years) and I brought them back to life.

Need:
- Fuel injector actuator (sold as an injector tester online, $30 generic connector - $60 with injector plug).
- Carburetor cleaner or similar fuel system solvent, several ounces + a pressured can with a small straw-like attachment
- glass container (something that the cleaner won’t dissolve)

>>> It’s advisable to wear eye protection during this, especially step 3 <<<

1 - fill the container with cleaner to a depth 1” or so above the injector nozzle
2 - place the injector nozzle down into the cleaner, run the actuator continuously for several minutes
3 - while continuing to run the actuator, remove injector and spray the cleaner through the fuel inlet orifice in the back.
4- cycle through steps 2 and 3 until you get a fine, uniform spray.

I haven’t tried this with K-Bike injectors but expect that it should work.

Obviously this won’t flow test nor rate the injectors, but it works well and is pretty low cost.

Injector electrical actuator:
https://www.ebay.com/itm/US-Ship-All-Sun-EM276-Injector-Tester-Fuel-Injector-4-Pluse-Modes-Fuel-System/252990688970?epid=10028399003
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For $60 more, you can buy an injector cleaner kit that includes a metal container you fill with cleaner, pressurize, and attach in place of the fuel line on the bike. This can be used to leak down/ flow test and match individual injectors if you want.
https://www.ebay.com/itm/US-STOCK-AUTOOL-Car-Petrol-Injector-Cleaner-Tester-Non-Dismantle-Fuel-System/223134514003?epid=8002679867
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Title: Re: DIY fuel injector cleaning
Post by: schrocketeer on February 13, 2019, 11:54:38 PM: I threw mine in a 1 gallon can of Berryman's carb cleaner for a week. Then I used a K-Mart battery charger and some alligator clips to put 12 volts across the pins of each injector. Repeated this cycle a couple of times.
After I heard the injectors "click" with voltage across them, I attached them to the fuel rail, but I did Not put the injectors in to the engine. With a piece of notebook paper under each injector, I turned on the key, and hit the starter switch. Brown liquid squirted out, then normal gas.
From there I installed the injectors in to the engine, and it ran fine.
This was after sitting for 3+ years.
Title: Re: DIY fuel injector cleaning
Post by: Martin on February 14, 2019, 01:45:25 AM: I made up an air powered set up to pressurize the injectors adjusted to 36 PSI and bought the injector pulsar (Ebay) to activate them. I use a graduated vessel and time the flow while checking the pattern. A local workshop that also does injectors advised me to stop using injector cleaner and use lacquer thinners as it is more economical and cleans better. I tried the thinners on some injectors that were totally blocked and had resisted cleaning with injector cleaner, and they cleared. I also soak them sometimes in a sonic jewelry cleaner (Aldi) while activating with the pulsar.
Regards Martin.
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Title: Re: DIY fuel injector cleaning
Post by: natalena on February 14, 2019, 08:56:17 AM: Quote from: Martin on February 14, 2019, 01:45:25 AM
A local workshop that also does injectors advised me to stop using injector cleaner and use lacquer thinners as it is more economical and cleans better.

Old School. My 75+yo neighbor showed me using lacquer thinner is superior, last summer. Great tip!
Title: Re: DIY fuel injector cleaning
Post by: bizzaro on February 21, 2019, 09:35:34 PM: This is why I love Motobrick! bmp :clap: :popcorm Still the best freaken forum on the web.
Title: Re: DIY fuel injector cleaning
Post by: Chaos on February 22, 2019, 12:12:23 AM: I've put off getting mine cleaned because I'm cheap. Now I have a cool DIY project!
Title: Re: DIY fuel injector cleaning
Post by: Martin on February 22, 2019, 01:10:48 AM: Chaos I air powered mine to avoid any chance of BADDA BOOM.
Regards Martin.

Fuel injector pulse tester plan.jpg.png (26.83 kB . 768x452 - viewed 813 times)
Title: Re: DIY fuel injector cleaning
Post by: bizzaro on February 22, 2019, 06:17:03 AM: Shit Man, that ain't noth'n......................have you seen the Space Ship Martin is building. And all of it from scrap at the junkyard.