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🔧 Diagnose like a pro, avoid costly injector surprises!
The OTC 3398 Fuel Injection Pulse Tester is a battery-powered diagnostic tool designed for precision testing of vehicle fuel injectors. It offers three pulse timing modes—single 500ms pulse, 50 pulses at 10ms, and 100 pulses at 5ms—allowing detailed cylinder balance checks by firing injectors individually at half-second intervals. Equipped with power and output indicator lights, this compact, lightweight device ensures reliable injector diagnostics to help prevent engine performance issues.





| ASIN | B0002SR5OO |
| Brand | OTC |
| Brand Name | OTC |
| Color | Black |
| Colour | Black |
| Compatible Devices | Vehicles |
| Customer Reviews | 4.3 out of 5 stars 133 Reviews |
| Global Trade Identification Number | 00731413008818 |
| Item Dimensions | 12.4 x 5.1 x 20.6 centimeters |
| Item Weight | 1 Grams |
| Item dimensions L x W x H | 12.4 x 5.1 x 20.6 centimeters |
| Item weight | 1 Grams |
| Manufacturer | OTC |
| Measurement Type | Pulse Tester |
| Model | 3398 |
| Part Number | 3398 |
| Power Source | Battery Powered |
| Power source | Battery Powered |
| Specification Met | REACH |
| Style | Industrial |
| Style Name | Industrial |
| UPC | 731413008818 |
| Unit Count | 1 Count |
J**T
Great tool
I have used it for troubleshooting injector, it helped me to discover faulty injector before installing in vehicle. Satisfied with the product.
B**A
Didn't work
Hooked ip to car as per instructions, 1 light lit up but wouldn't activate injector. Flimsy tool .
E**E
Great OTC Tester!
My husband is extremely happy with this OTC Tester! He said it does everything it is supposed to do. It works very nice, it seems to be a very high quality, and it has already been an extremely helpful item for him! He was sad that it is made in China, but he said the quality seems to still be great for OTC. He does think that for the $100+ price, it should come in a case to keep it safe as it is a bit delicate to be loose in a toolbox drawer. I'll be looking online to see if I can find him something to put it in. Any ideas from the other buyers here?
A**E
Très utile!
Très utile pour test de débit d'injecteurs!
E**D
Excelente pulsador de inyectores
Ayuda para diagnóstico rápido y eficiente de problemas de desempeño en el motor. Descarta problemas de inyectores de manera profesional. Debe utilizarse con un medidor de presión de combustible.
N**E
Must have tool for diagnosing fuel injectors!
This is an excellent tool for those who want to diagnose a defective fuel injector, or bench test a replacement prior to installation. Many times I found that replacement fuel injectors become stuck by sitting on the shelf at the parts store. Nothing worse than installing injector(s) on a vehicle, still having the same problem, going crazy thinking something else is wrong & wasting more time & money replacing other parts.... when all along you got burnt installing a bunk injector. For this reason, I ALWAYS bench test any injector I replace on a vehicle. Doing a job twice is no fun. This tool is very easy to use. Simply connect the power leads to a 12 volt car battery, hook up the injector, select the pulse width, and press the button. If the injector clicks, you know you're good to go! If it doesn't click, you likely have a stuck injector & you'll have to call the parts store to get another one.
Trustpilot
1 month ago
4 days ago