Mail-In Nationwide · Fountain Inn, SC

Automotive Fuel Injector Cleaning and Flow Testing

Your automotive fuel injectors come back cleaned, flow tested, and documented with the before and after data to prove the work. Cars, trucks, SUVs, and powersports engines. From $25 per injector, parts and labor included.

Ship Your Injectors →

★★★★★ Five stars on Google · Travis and Jason do the work

On the Bench · Spray Test Clogged, then dialed in

Before · clogged

After · dialed in

Per-Injector Pricing

One price per injector. Parts and labor are in it.

Service	Price
Top feed	$25 per injector
Side feed	$30 per injector
GDI	$30 per injector

Every service includes ultrasonic cleaning, before and after flow testing, leak-down and resistance tests, spray pattern analysis, new o-rings, seals, and filter baskets, and the diagnostic report. If an injector cannot be saved, you are not charged for it. One bill at the end.

Gasoline injectors only. We do not service diesel or piezo injectors. That is a different bench and a different animal, and it is not a direction we are headed.

Benchmark
Clean
Replace components
Test ohms + impedance
Real-world flow test
Diagnostic report

Any Gas Injector, Any Engine

Old or new, four cylinders or twelve, daily driver or weekend build. If it runs gasoline injectors, it runs our bench.

Bosch Denso Delphi Siemens VDO Continental Keihin Nikki Hitachi Magneti Marelli Lucas and more

Those names cover nearly every gasoline fuel injector ever hung on a rail: top feed, side feed, and GDI alike. There is no fitment list to check, because the bench does not need one. Every set gets the same cleaning, the same before and after flow testing, and the same diagnostic report, whoever made it and whatever it came off.

How we dial your injectors in

Every injector comes off the bench cleaned, resealed, and flow tested against the set.

Before

One injector from the set, caked in carbon and varnish with the old o-rings pulled. Spray pattern breaks up, flow drops below spec.

The same automotive injector set, cleaned and resealed with new o-rings, numbered and flow tested

After

The same set after the bench: cleaned, resealed with new o-rings, and flow matched.

On the ASNU bench

Spray pattern testing

Individually spray tested and inspected for atomization quality, leak-down, and resistance. Flow data alone will not show these.

Flow rate analysis

Each injector's output in cc/min against the full set. Factory tolerance runs about 2 to 4 percent, and the report shows the exact spread we measured.

Rebuild and report

New o-rings and filter baskets as routine, other parts when your injectors need them, itemized at cost. The report documents before and after flow, spray grades, variance, and recommendations.

Sample automotive diagnostic report showing before and after flow rates, spray grades, and variance across the set

And you get the data to prove it. Every set ships back with a report like this, before and after flow, spray grades, and the variance across the set.

What People Say About the Work

The bench data is only half of it. The other half is how the job goes.

★★★★★

“You don’t find service like this easily these days. The guys had my injectors cleaned and back out in one day, kept me informed, and sent videos of the complete service. Highly recommend Dialed Injectors.”
Don · Google review

★★★★★

“What really stood out was that they didn’t just service the injectors, they also took the time to offer advice on other potential issues I should check on my motor. That kind of customer service and willingness to help is hard to find these days.”
Harrison · Google review

★★★★★

“Quality work, with a quick turnaround time and easily the best customer service and communication I have encountered from any business.”
Firebeards Fishing Company · Google review

Read all our reviews on Google

Automotive Fuel Injector FAQ

What does automotive fuel injector cleaning cost?

$25 per top feed injector and $30 per side feed or GDI injector. Parts and labor are included in the per-injector price. If an injector cannot be saved, you are not charged for it.

Do you service GDI injectors?

Yes. GDI injectors are $30 per injector and test at 5 bar, 72.5 PSI, against 3 bar for manifold injectors. Same cleaning process, same before and after report.

What injector brands do you service?

All the major manufacturers: Bosch, Denso, Delphi, Siemens VDO, Continental, Keihin, Nikki, Hitachi, Magneti Marelli, Lucas, and more. If it is a gasoline injector, top feed, side feed, or GDI, it runs our bench no matter what engine it came off.

My injectors are discontinued. Can you save them?

Usually. Cleaning restores flow and spray on injectors with healthy coils, and the resistance and leak-down tests tell us early when one is beyond saving. If it is, you are not charged for it. Discontinued sets are a big part of what lands on this bench.

Do you rebuild injectors?

We clean, test, and replace the wear components, what the parts catalogs sell as a rebuild kit: o-rings, seals, pintle caps, and filter baskets. We do not machine or replace internal components. If cleaning and new wear components cannot bring an injector back, we tell you instead of billing you.

How does shipping and turnaround work?

Get a UPS label from the ship page or use your own. Our labels carry $1,000 declared value coverage by default, and you can opt out when you build your label to save roughly $17 each way. Once the injectors land, bench time runs about two days, then they ship back the way they came in. You pay when the work is done.

What is in the diagnostic report?

Per-injector before and after data: resistance, leak-down result, spray pattern grade, static and dynamic flow volumes, flow rate in cc per minute, percent change, and deviation from the set average, plus the set spread and service notes covering every part replaced.