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Old 10-05-2005, 05:47 PM   #1
greenguy
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Default Fuel injector service

Has anyone sent out their fuel injectors for cleaning? any recomendations 318 Ti---Also does anyone know the reason for a vacuum line going to each injector?
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Old 08-27-2007, 10:11 PM   #2
tastade
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Yes, Witch Hunter Performance (www.witchhunter.com) will clean your fuel injectors and replace gaskets. They measure flow before and after cleaning. You remove your injectors from the fuel rail, pack them carefully and send them off. Witch Hunter performs their service, promptly, and sends them back in the same packaging you used to send them in. From the time I sent the injectors to the time I had them back in my hands took 1 week.

Sorry to resurrect the very old post, but I was just getting ready to post a new post for this specific question.

Attached are my results:
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Click image for larger version Name:	injector cleaning.jpg Views:	260 Size:	40.8 KB ID:	4308  
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Old 12-03-2007, 12:59 AM   #3
steve318ti
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Can you use Techron?
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Old 12-03-2007, 04:34 AM   #4
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Quote:
Originally Posted by steve318ti View Post
Can you use Techron?
I do all the time. Works wonders
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Old 12-03-2007, 09:08 PM   #5
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Using techron is different than having your injectors professionally cleaned. I just used cruzinperformance. He tested them for flow pattern, flow rate, etc.. They are then cleaned, and "backflowed" on an ANSU cleaning machine. Finally new filters, and o-rings are put onto them. Once the cleaning is done they test them for spray pattern and flow rate again. 16$ per injector plus shipping.

The different tests performed-
Injector resistance
Leak down
Spray pattern
0 second pulsed flow(mL)
100mL pulsed volume
0 second static flow
100mL static flow(mL)


Much better idea then spending almost 100$ a piece for new injectors. My car has 140k miles and I always run a good brand of gasoline at 91 or 93 octane(US octane rating) and my injectors were in really good shape when he first tested them. Cleaning them did make a difference, the flow rates went up, but mine were still spraying in a good pattern. They probably didn't need to be cleaned, but with 140k miles on them there is no way to really tell without pulling them and testing them.

As for injectors needing the vacuum line. Like most things in the fuel system it is run off of pressure. The vacuum lines are what help the injector spray the fuel
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