DieselGeeks

DieselGeeks Diesel Geeks was established to support Diesel Owners and those who repair them
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17/06/2026

Thinking your Denso injectors might have suffered from contamination?

Here's some helpful hints

16/06/2026

Finalising the 4JJ1 RACE injectors.
Who wants some +180 to +200 injectors???
Yewwwww

After a family situation, we've had to make today up to Procheck Automotive a day trip limiting what we could bring on t...
13/06/2026

After a family situation, we've had to make today up to Procheck Automotive a day trip limiting what we could bring on the plane. But still come out, the guys here have put on a great show.

10/06/2026

Not all fuel filters are created equal.

A lot of people ask, “What micron is that filter?”

Fair question. But it is only half the story.

A filter might be rated at 2 micron, 10 micron or 30 micron — but that does not tell you how much contamination it actually stops. That comes down to filter efficiency.

And on modern common rail diesels, that matters.

Tiny particles, water, rust and dirty fuel can do serious damage to high-pressure fuel pumps and injectors. These parts run at huge pressure with extremely tight tolerances, so poor filtration can get expensive very quickly.

The big thing to understand is this:

Your fuel system is not just using fuel once. Diesel is constantly moving through the system, with unused fuel often returning back to the tank. That means good filtration is also helping clean the fuel over multiple passes.

That is why fuel quality, water separation, filter efficiency and correct servicing all matter — especially if you tow, tour, fill up in remote areas or rely on your 4WD every day.

Do not just ask, “What micron is it?”

Ask:

✅ How efficient is the filter?
✅ Does it separate water?
✅ Is it suitable for my vehicle’s fuel flow?
✅ Is it installed correctly?
✅ Is my fuel actually clean?

Clean fuel protects expensive parts.

Dirty fuel can destroy them.

We’ve put together a full blog explaining fuel filtration, fuel polishing, micron ratings and why modern diesel fuel systems need proper protection.

Have a read here: https://dieselgeeks.com.au/fuel-filtration-vs-fuel-polishing-why-microns-are-only-half-the-story/

09/06/2026

So I'm heading up to the legends at Procheck Automotive to talk to end users and talk all things Diesel and Injectors.
Genuine question - what is it that you all think I should bring and talk about?

05/06/2026

Buying injectors for your Hilux?

The injectors are only one part of the job.

There are a few other bits you should seriously think about while you’re in there:

Nozzle washers
Leak-off washers
Fitting kit
Injector bolts
Fuel lines
Suction Control Valve
Intake clean-out kit

What you need depends on your budget, the condition of the car, and how long you plan on keeping it.

Bare minimum? Do the washers and the proper fitting gear.

Want to do the job properly? Look at the fuel lines, SCV, and intake clean-out too.

This video breaks it down nice and simple so you know what’s worth buying with your injectors.

Shop genuine parts here:
www.dieselgeeks.com.au

20/05/2026

Let’s get into something useful.
Navara injectors are beasts. Massive flow rate. Super short injection duration.
So even the smallest fault in one injector multiplies fast.
That’s why smoke shows up early on these. One tiny issue becomes a big mess.
If you're seeing smoke and struggling to find the culprit, don’t just look at flow. Look at the rate and timing.

When other workshops couldn’t get the job done, Matty stepped in. 👨‍🔧Boris bought injectors from us, installed them hims...
19/05/2026

When other workshops couldn’t get the job done, Matty stepped in. 👨‍🔧
Boris bought injectors from us, installed them himself, and even after two Sydney workshops failed to code them, we made sure he was looked after.

That’s the Diesel Geeks difference:
✔ Real support
✔ Expert guidance
✔ We don’t leave you stranded

Thanks for trusting us, Boris! 🙌

18/05/2026

The diesel injector industry has not always been easy to trust.
Too many people have been left confused by unclear testing, vague reports, and poor communication.
We built the Diesel Geeks Workshop App to change that.
Clear testing updates. Easy-to-understand results. Full transparency around what is happening with your injectors.
No guessing. No fluff. Just honest diesel testing done properly.
Launching this Thursday.

17/05/2026

While diagnosing this 2013 Hilux, I wanted to see if it had been tuned — or if there was anything limiting performance. The customer had just picked it up. Car looks spotless and pulls well. I pulled up the injection volume readings and found 107 mm³ — which is way above stock. For a Hilux, I usually expect between 72–77 mm³. If it was a Prado, we’d be looking at 90–92 mm³. So 107? It’s tuned. No question.
But here’s the kicker — if I was seeing low power and the volume reading was around 40, I wouldn’t be calling it mechanical right away. That tells me the ECU is pulling fuel.
Why? Could be MAF or MAP sensor readings telling the ECU there’s not enough air. That triggers emissions-based limits in the ECU, and it just doesn’t bother injecting more fuel.
Other times, the ECU tries to inject fuel, but the motor can’t deliver the power. That’s your mechanical fault — injectors, compression, whatever.
The injection volume tells you which path to go down.
Sensor fault? Or actual hardware issue?
In this case, I also checked the rail pressure — and it looked stock. So the injection map’s been touched, but not the fuel pressure side.
Always pull the numbers first. Don’t guess your way through low power issues.

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