Noisy injectors

[RonDwyer]

Got the 5 back on the road finally, mostly there on the smog check, it runs a little lean, playing around with resistors on the CTS circuit. I have noticed the injectors seem to be noisier that I recall. The E12 is not exactly well insulated from engine noise.

Here's my question, there seems to be a lot of places offering rebuilt injectors. Are these places actually separating the steel housing from the plastic solenoid housing and replacing parts inside or is this just a clean and test gig? I cant seem to get my mind around how one would take an injector apart. They seem to be permanently bonded together.

Does anyone have any firsthand experience with any of these 'rebuilders' and is this the best way to go vs. new? I'd be worried about getting chinese junk if i order new ones.

[Qwodracer]

Got the 5 back on the road finally, mostly there on the smog check, it runs a little lean, playing around with resistors on the CTS circuit. I have noticed the injectors seem to be noisier that I recall. The E12 is not exactly well insulated from engine noise.

Here's my question, there seems to be a lot of places offering rebuilt injectors. Are these places actually separating the steel housing from the plastic solenoid housing and replacing parts inside or is this just a clean and test gig? I cant seem to get my mind around how one would take an injector apart. They seem to be permanently bonded together.

Does anyone have any firsthand experience with any of these 'rebuilders' and is this the best way to go vs. new? I'd be worried about getting chinese junk if i order new ones.

A "rebuild" is typically a vibration clean, new cap, new screen, and 2 o-rings.... the inner (oring) if bad is not typically replaced and labeled as a "lifetime" part, meaning it goes bad you need a new injector, as is the coil and the plunger.

A Bosch part number is a Bosch injector.. they are putting their name on it. Don't get an off brand if you are worried about Chinese crap

I did notice my injectors are loud, but to me it's not worth the hassle of any of these steps, even thou I have everything to exactly as the rebuilders do, I could just do it myself.


You mentioned in another post you are running slightly lean, after sitting 5 years, perhaps the end of the injector is slightly plugged from these crap ethanol fuels and causing this condition. So it may be worth the effort for you to do something.

[Mike W.]

Agreed on them not taking them apart, although I've had plenty of -152 injectors start leaking from the body. I've got a boatload of E28 injectors, I ought to try to take one apart!

[T.Hanson]

Does injector cleaner in a bottle work at all for light maintenance ?

[Mike W.]

Does injector cleaner in a bottle work at all for light maintenance ?

I've had some success with Techron. Not cleaner with Techron, straight techron. Nothing else I've used did any good at all. I've also heard good things about BG44 but I've never tried it.

[PatinaBeforePolish]

Ron,

I've always used Mr. Injector.

http://www.mrinjector.us/

Fast service, returned with a before and after flow graph.