Diesel Black Smoke in Hillsboro, KS
The short answer
Black smoke from a diesel means the engine is getting more fuel than it has air to burn, so some of that fuel leaves the tailpipe as soot instead of power.
A puff when you floor an older truck can be normal, but steady black smoke is not, especially when you pull away from the elevator in Marion with a full trailer and the car behind you disappears. It usually comes down to a clogged air filter, a boost leak, a leaking injector, or the turbo or EGR system, and we find out which before anything gets replaced. Bring it in, or we will come and get it.
Call or text (620) 416-0008. Describe the noise. We'll do the rest.
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What your black smoke is telling you
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Text us which onesHow we fix diesel black smoke at Moxie
We find the reason for the smoke instead of treating the smoke. Black smoke has half a dozen possible causes, ranging from a filter to an injector, and testing first saves you from paying for the wrong one.
We start with the cheap stuff. A clogged air filter is quick to check and inexpensive to fix, so it gets ruled in or out before we reach for anything bigger.
We keep your diesel running the way the manufacturer built it, emissions system included. You get a plain explanation and a price, and nothing is done until you approve it.
Why Hillsboro brings diesel black smoke to Moxie
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Dealer-level diagnostics
We test injectors, boost and airflow directly instead of guessing from a single code.
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An ASE-certified technician
Our technician is ASE certified in engine repair, automatic transmissions and drivetrains, and Moxie pays for ASE testing for the whole team.
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Warranty in writing
Most repairs carry the NAPA 24/24 nationwide warranty for 24 months or 24,000 miles, and engine and transmission work carries Moxie's own one-year warranty. We tell you which one covers your repair before any work starts.
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Free pickup and delivery
Within 40 road miles, from Marion to McPherson and Newton, we can collect the truck and bring it back.
Call or text (620) 416-0008. Describe the noise. We'll do the rest.
Black smoke myths we hear at the counter
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Sounds like yours? Tell us what it is doing and we will tell you straight.
Can I keep driving?
You can usually drive it to a shop, but do not ignore it for long.
Black smoke itself rarely leaves you stranded, but it is fuel being wasted and soot being made. On a newer diesel that soot goes straight into the exhaust filter, and a filter that clogs faster than it can clean itself becomes a much bigger repair. A leaking injector can also wash oil off the cylinder walls over time. Get it checked soon rather than living with it.
Stop driving and call us if
- The engine starts knocking louder or runs roughly
- The truck drops into limp mode or reduced power
- The oil level is rising, which can mean fuel is getting into the oil
- The engine temperature climbs while towing
Paying for it
This is one of the repairs people put off because of what it costs, and putting it off usually makes it worse. You can split it into payments and get the vehicle back on the road now, with Affirm, Sunbit, Synchrony Car Care, NAPA EasyPay and more, including options for credit that is still being built.
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What causes diesel black smoke around here
- A dirty or clogged air filter, which gravel and field dust around here fill quickly
- A boost leak from a split hose, a loose clamp or a cracked intercooler, the radiator that cools the air from the turbo
- A leaking or sticking fuel injector putting in more fuel than the engine can burn
- A worn turbocharger that is not delivering the air it should, often noticed first while towing
- A stuck-open EGR valve letting too much exhaust back into the engine
- A faulty sensor giving the computer the wrong reading, so it adds too much fuel
How we find the cause of black smoke
- We ask when the smoke appears, at idle, under load or all the time, because each points somewhere different.
- We check the simple things first, starting with the air filter and intake, since a blocked filter is an inexpensive fix.
- We read the engine computer and watch live data for boost, airflow and fuel delivery during a road test.
- We pressure-test the intake to find any boost leaks.
- We run injector balance tests to find any injector that is putting in too much fuel.
What we check
- Air filter and intake ducts
- Boost hoses, clamps and intercooler
- Turbocharger condition and boost control
- Injector balance and leak-back
- EGR valve operation
- Airflow, boost and exhaust sensors
- DPF soot load on trucks that have one
What the repair usually is
- A new air filter, which is sometimes the whole repair
- Replacing a leaking boost hose, clamp or intercooler
- Replacing or repairing a faulty fuel injector
- EGR valve cleaning or replacement
- Turbocharger repair where it is not making full boost
- Replacing a failed airflow or boost sensor
Diesel smoke problems across five Kansas counties
We look after drivers across Marion County, Harvey County, McPherson County, Chase County and Lyon County, with free pickup and delivery within 40 road miles of 611 Orchard Dr, Hillsboro.
Diesel black smoke questions we hear every week
Is black smoke from a diesel normal?
A brief puff when you accelerate hard on an older diesel can be normal. Steady black smoke is not, and neither is smoke from a newer truck with an exhaust filter. Modern diesels are built to run almost smoke-free, so visible black smoke means the air and fuel are out of balance. Text us a photo or a short video and we will tell you honestly what we think.
Can a dirty air filter cause black smoke?
A clogged air filter is one of the most common causes, especially on trucks that spend time on gravel and field roads around Marion County. Less air means the fuel cannot burn completely. It is the first thing we check, because it is quick to rule in or out and it is the cheapest fix on the list.
How much does it cost to fix black smoke from a diesel?
The cost depends on the cause, which could be anything from an air filter to an injector or a turbo. That is why we diagnose first, so you know exactly what you are paying for. Call or text (620) 416-0008 and we will talk you through it, and you approve the price before any work begins.