Hammond, WI · Family-Owned · Veteran-Operated
Diesel Repair & Performance in Hammond, WI
PowerStroke, Cummins, and Duramax diagnostics, repair, fabrication, and performance upgrades. Honest, fair diesel service from an ASE-Certified shop and authorized JASPER® installer.
- ASE-Certified
- JASPER® Installer
- BD Diesel
- aFe Power
- Baja Designs Dealer
About us
Your Trusted Partner for Superior Diesel Solutions!
Midwest Diesel & Automotive is a family-owned, veteran-operated diesel and auto repair shop in Hammond, Wisconsin, serving St. Croix County since 2021. We specialize in Ford PowerStroke, Cummins, and Duramax diesels, from diagnostics and routine maintenance to JASPER® engine replacement, custom fabrication, welding, and wiring.
What sets us apart is how we do business: straight answers, fair pricing, and clear communication on every job. You’ll know what’s wrong and what it takes to fix it, explained in plain English.
Daily-driver pickup or full performance build, bring it to Hammond.
Parts & Partners
Built With Brands Diesel Owners Trust
From routine oil changes and brake service to complete engine and fuel system work, we install quality parts from the names serious diesel owners already know.
Off-Road Lighting
Now Carrying Baja Designs
At Midwest Diesel & Auto, we believe that high-performance builds demand high-performance visibility. That’s why we are proud to announce that we are now an authorized dealer for Baja Designs—the premier name in off-road auxiliary lighting.
Whether you are pushing your PowerStroke to the limit on the trail or need reliable visibility for your Cummins workhorse during late-night hauls, Baja Designs offers the durability and precision you need. Known as “The Scientists of Lighting,” their systems are race-proven in the harshest terrains on earth.
Why Upgrade to Baja Designs?
- 5000K Daylight Natural Color: Reduces driver fatigue and increases terrain recognition, unlike the harsh blue hue of standard LEDs.
- uService® Technology: Replaceable lenses and optics mean if you damage a light, you fix it right here—no need to send it back.
- Built for Your Build: From vehicle-specific kits for Ford Super Duty and RAM trucks to universal light bars, we have the perfect fit for your rig.
Stop by our Hammond, WI shop to see how we can brighten your drive with the best lighting on the market.
Services
Service & Repair for Your Diesel
BATTERY & ELECTRIC
Electric Services cater to all your vehicle's electrical needs, from battery testing and diagnostics to repairs.
BRAKE SERVICES
Count on us to keep your vehicle's braking system in top-notch condition for a safe and smooth ride.
DIAGNOSTICS
Trust our advanced diagnostic tools to provide accurate assessments, ensuring your vehicle performs at its best.
HEATING & AIR
We make sure your climate control system is in top condition, delivering comfortable driving.
OIL CHANGES
We provide timely and thorough oil changes, using high-quality products to ensure optimal engine performance.
SUSPENSIONS
From diagnostics to repairs and upgrades, we make sure your suspension system is in top condition.
TRANSMISSIONS
We use advanced techniques and quality parts to keep your vehicle's transmission in optimal condition.
TUNE UPS
We conduct thorough vehicle inspections and adjustments to optimize your engine's efficiency.
JASPER Engines & Transmissions
Jasper® Engines Installer
As a JASPER® Installer, Midwest Diesel and Auto located in Hammond, WI. harnesses the vast array of resources provided by JASPER® to help you make well-informed decisions regarding replacing your vehicle’s engine, transmission, differential, or fuel system.
JASPER® Engines extends a remarkable 3-year, 100,000-mile nationwide transferable warranty on all their products. With a specialization in remanufacturing engines, transmissions, diesel, differentials, and fuel systems, JASPER® has maintained its presence in the United States since 1942. When you choose JASPER®, you’re choosing confidence.
The Nation's Leading Supplier of Car & Truck Engines
PowerStroke · Cummins · Duramax
Common Diesel Problems We Fix
Recognize a symptom? Here's what usually causes it, and how we fix it.
- 01
Loss of Power / Limp Mode
Sluggish acceleration, weak towing, or a sudden drop in power. Usually turbo, EGR, or fuel delivery.
The fixFull diagnostics, turbo repair, EGR service, fuel system repair
- 02
Excessive Smoke
Black, white, or blue smoke at startup or under load. Typically injectors, turbo, or DPF.
The fixInjector service, turbo rebuilds, DPF cleaning and regeneration
- 03
Hard Start / No Start
Long cranking or no start at all. Glow plugs, high-pressure fuel pump, batteries, or air intake.
The fixGlow plug replacement, fuel system service, complete diagnostics
- 04
Turbocharger Failure
Whining, loss of boost, or oil in the intake. Common on high-mileage PowerStroke and Cummins trucks.
The fixTurbo inspection, rebuild or replacement, boost testing
- 05
Fuel System Problems
Clogged or failing injectors, a weak high-pressure pump, contaminated fuel, or worn filters.
The fixInjector cleaning and replacement, pump repair, full fuel service
- 06
DPF / EGR / Emissions
Frequent regens, check-engine light, and reduced power from a clogged DPF or failing EGR valve.
The fixDPF cleaning, EGR repair, emissions system repair
- 07
Charging & Electrical
Dead batteries, a failing alternator, or wiring faults common in modern diesels.
The fixBattery and alternator testing, replacement, custom diesel wiring
- 08
Rough Cold Starts
Rough idle and hard cold starts from restricted airflow or failed glow plugs. A Wisconsin-winter classic.
The fixIntake cleaning, glow plug replacement, sensor diagnostics
Not sure what you're dealing with? Start with a diagnostic.
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Spot these 5 diesel engine warning signs before they cost you thousands. Expert platform-specific guide for PowerStroke, Cummins, and Duramax owners.
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Reviews
What our customers are saying
While these guys deal, mostly, in complicated fixes and rebuilds, they were not too busy to help get me, immediately, back on the road after a flat. Great company with wonderful service and dedicated professionals! Would recommend A+++
Bridget Colleen
I Deliver RVs throughout the country. I had an issue with my transmission and I stopped in there they immediately solved the problem fixed it and I was on my way, I’ve never had an experience such as this, great job. I would recommend these Mechanics to anyone.
Scott Campbell
Dan and Tim are great, they’ve done work on my trucks and car. From fixing repairs I’ve got done at other shops to tires and transmissions, these guys get it done right and on time every time. My new go to!
Steven D
I needed a quick fix while I was traveling and they provided quality work without even charging me anything. They are great to their customers and I highly recommend them!
Brad Vosters
Great mechanics very informative was very happy with service.
Brad Wethern
Wonderful fast work! Great prices even with my very problematic vehicle would recommend to anyone!
Wyatt
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