Rebuilding fuel injectors or just get new injectors?

[Olly84]

Hey everyone, have a little bit of spare time on my hands and wanted to clean my injectors. Car is at 183,000 miles and not exhibiting any issues, just wanted to do it as a preventative.

Was just thinking about buying this cheap rebuild kit to change the seals and the little filter inside the injectors, is this basically the same as a new injector at a fraction of the cost?

Thank you in advance.

[JimLev]

Do you have a link to that kit?

[CPHES]

Look at this

https://www.mrinjectorparts.com/

[CPHES]

So I’ll say this - if you are interested in this - even experienced guys like Jim, I would get a couple of used eBay injectors to play with. I’d like to get the v12 done, but I don’t want to break an injector, and be down. M62 injectors are easier to come by. The outer seals make a difference. I am sure some of the filters will have some crud, but if you don’t have a misfire / smoothness issue, they are likely not too bad.

[JimLev]

The reason I asked is because I didn’t think the injectors on the V8 would come apart. I do have a spare junkyard set.
About 6 -7 years ago I did run BG44 cleaner thru each of them for 5min under pressure. I didn’t notice any difference in power or MPG.
I do use Techron, probably more than recommended, more is better!

[StephenVA]

More cleaning is better!

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 Jim mentioned, if your injectors are clean, (pintles and filters) than 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/

[ross1]

Lots of places will "re-man" them which is cleaning, testing and fitting new filter and O-rings for ~$20 a pop.
FWIW I had a set done after 240k miles figuring they needed it and didn't notice any difference. I'm another Techron user.
New are friggin expensive.

[StephenVA]

Trash gas = lots of blockage. I tested 20-30 sets where the really bad ones were all 20-40% restricted. The ones out of cars where the owners reported quality gas showed little to zero flow issues.
lots of stop and go creates lots of build up.

[MotorMouth93]

You can send your injectors off to companies like Mr. Injector, RC engineering, or a few others and they'll ultrasonic clean injectors, replace the filters and O rings, and flow test to ensure spray patterns are correct and flow is spot on for $15-$20 each. It's not a bad idea to have it done every 100k-150k miles.

Just replacing filters yourself won't do much without the ultrasonic cleaning.

[SpeedyE38]

You can send your injectors off to companies like Mr. Injector, RC engineering, or a few others and they'll ultrasonic clean injectors, replace the filters and O rings, and flow test to ensure spray patterns are correct and flow is spot on for $15-$20 each. It's not a bad idea to have it done every 100k-150k miles.

Just replacing filters yourself won't do much without the ultrasonic cleaning.

This is the route I took on my Honda C30a motor (I have had a few). Any sign of hesitation, i pull the injectors and send to RC Engineering. They send back a properly-functioning injector with a printout of pre and post flow data. It is really impressive. Though, i suppose you could do quite a bit of cleaning with an ultrasonic cleaner...but you couldn't test the results outside the car.

[MotorMouth93]

Oh hey another NSXer here.

I, too, have gone through a couple C30As. Makes BMW parts seem cheap.

[BMW540san]

The OEM Bosch injectors are expensive but not as much as some may think. I've bought many parts here for years, no tax (at least in TN) and free shipping over $99
https://www.rmeuropean.com/Products/...843-MFG14.aspx

[DennisG01]

Just throwing out another vote for having them professionally cleaned. I've gone through this a few times with different vehicles and feel it's well worth the $20 per injector. There's a really good fuel injection shop nearby so it's easy for me to drop them off. But I would imagine that most decent sized cities would have shops. Given that you're down there in NASCAR land, I have to imagine that you would easily find a good shop.

[bdiefAZ]

I clean them on the car with the OTC 7448a cleaner with "Pro Inject-R-Kleen" Fluid. You essentially disable the fuel pump, adjust pressure, and run this fluid directly into the fuel rail. Old varnish, deposits, and anything inhibiting the spray pattern is removed along with the ports. We cleaned a Z3M today with 135k, it took 2 cycles, but power restored!

This is one of the best tools in my garage.