90 Q Injectors - How to clean when out of car

[John Nordling]

Pulled the plenum to replace essentially everything last August and still haven't finished - but making progress. I had a bad #3 injector diagnosed by the local dealer, so I bought 4 new ones to fit under the plenum. The others are out of the car, so none of the posts I have read about cleaning injectors while the car is running will work.

I can take the injectors to Dr. Injector, a chainstore service facility, but after talking with the owner, I'm not particularly impressed. He charges $40@ with no guarantees. Is this my best option?

Thanks in advance........John:D

[DAEDALUS]

Uh, $40 each, or $40 for all 8? I'm thinking there's little he could do that would be better than a good old fashioned rail flush. A rail flush for $40 is a deal though.

[Q45tech]

The best is to find a service where they flow test each one and give you a written report showing cc's at 43.4 psi for each at somespecific duty cycle say 55%. Ideally you would like to match them perfectly at 2.0 milliseconds [60 mph cruise].........but don't be surprised at a 3-5% variance.

[elwesso]

I remember someone saying that (in canada maybe) they got their injectors ultrasonically cleaned somehow. Might not be a bad idea looking into it.

[John Nordling]

Thanks, folks. The cost was on a per each basis, which is why I wondered if it was worth it versus biting the bullit for 4 more new ones. Now I know to ask about testing and the duty cycle. If I don't get a favorable response, I'll shop around.

Tried looking into ultrasound, but net readily apparant such services exist in the immediate Seattle area. Anyway, your comments helped me make up my mind........John

[DougQ45]

Try Engine Performance Injectors in Whittier, CA (562) 693-8236. They do what the Q45 tech said, and I have had them do injectors for me in the past. THey were very good and charge about $25 per injector.

[John Nordling]

Thanks, DougQ45. I'll give them a call on Monday!