Maintenance · Engine Repairs & Rebuilds
Engine Trouble Diagnosed and Fixed Right the First Time
Knocking, misfiring, leaking oil, running hot, or a check-engine light that won't stay off — bring it to Wisco Speed & Performance. We find the real cause, repair what's broken, and when the miles have caught up, we rebuild it to run reliably for years to come.
Repair or Rebuild — We Do Both
From Check-Engine Light to Complete Rebuild, Under One Roof
When an engine starts knocking, burning oil, or losing compression, you need someone who knows what a healthy engine looks like inside — because we've measured it a thousand times over. Whether you drive a work truck, a daily commuter, or a classic car, the diagnosis is honest and the fix is done right the first time. We're not the cheapest shop in town — we're the one that doesn't do the same job twice.
Engine Diagnostics & Repair
Find the Real Problem Before It Becomes a Bigger One
Rough idle, misfires, oil leaks, overheating, loss of power, a check-engine light that keeps coming back — we chase the cause, not the symptom. Compression and leak-down testing, scan diagnostics, and eyes that have seen the inside of hundreds of engines tell us whether you need a repair or something more.
- Scan diagnostics, compression & leak-down testing — a straight answer, not guesswork
- Head gaskets, timing components, gaskets & seals repaired in-house
- Cooling and oiling system repairs before heat and starvation kill the engine
- If a repair won't hold, we'll tell you honestly — and show you why
Engine Rebuilds
Complete Rebuilds After Failure or Wear
When compression is gone, bearings are worn, or the miles have simply caught up, a rebuild is often smarter than a replacement. We tear it down, measure everything, machine what needs machining, and assemble it back to factory spec — so the engine you already own runs reliably for another 200,000 miles.
- Full teardown, inspection & measurement — you see exactly what wore out
- Rebuilds after failure — spun bearings, scored cylinders, blown head gaskets
- Rebuilds for daily drivers, trucks & classic vehicles alike
- Classic GM iron — Chevelle, GTO, Impala & Corvette engines are our home turf
Component Repair & Replacement
Worn or Damaged Parts Replaced Before They Take the Engine With Them
Most engine failures start small — a stretched timing chain, a seeping seal, a bearing that's just starting to complain. Catch it early and it's a repair; ignore it and it's a rebuild. We replace the worn component, inspect everything around it, and send you home with an engine you can trust again.
- Gaskets & seals — head gaskets, valve covers, oil pans, rear mains, intake gaskets
- Timing chains, guides & tensioners replaced before they skip or break
- Bearings, pistons & rings — bottom-end repairs done to spec
- Lifters, camshafts & valvetrain — including common GM AFM lifter failures
Restored to Reliable
Back on the Road — Running the Way It Should
The goal of every engine job here is simple: a vehicle you can start every morning without listening for trouble. Whether it's a modern truck that's been sitting with a dead cylinder or a classic that hasn't run right in years, we get it back to smooth, quiet, reliable running condition — and we verify it before you get the keys.
- Road-tested and re-checked after every repair — no "see how it goes"
- Classics brought back to life — engines that sat for years, running right again
- Modern & classic vehicles — all makes and models come through our shop
- You get the old parts and a straight explanation of what failed and why
General Engine Maintenance
Keep It Healthy So You Never Need the Rebuild
The cheapest engine work is the kind that prevents the expensive kind. Tune-ups, belts, spark plugs, fluid service, and cooling system upkeep keep a good engine good — and catch small problems while they're still small. We maintain everything we repair, and everything you drive.
- Tune-ups, plugs, belts & filters on schedule, matched to your engine
- Oil & fluid service — see our General Fluid Changes page
- Cooling system upkeep — the number one killer of engines is heat
- Every visit includes eyes on the engine bay from people who repair them daily
Service Area
Engine Work for Rosendale & the Surrounding Fond du Lac Area
Wisco Speed & Performance handles engine diagnostics, repairs, and rebuilds for drivers across east-central Wisconsin. Our shop at 177 N Grant St in Rosendale is a short drive from all of these communities:
- Rosendale, WI
- Fond du Lac, WI
- Ripon, WI
- Brandon, WI
- Van Dyne, WI
- Green Lake, WI
- Oshkosh, WI
- Berlin, WI
- Omro, WI
Not sure if your engine needs a repair or a rebuild? Call (920) 579-0605 and describe what it's doing — knocking, smoking, losing power, whatever it is. We'll tell you what it likely means and what it'll take to know for sure. No upsell script.
Request Service
Get Your Engine Looked At
A weird noise, a leak that's getting worse, or a rebuild you've been putting off — send the details and we'll call you back with a straight answer on cost and timing.
Call the Shop
(920) 579-0605Visit
177 N Grant St
Rosendale, WI 54974
What Happens Next
We'll call you within one business day to talk through what your engine is doing and get you on the schedule. No pressure, no upsell script.
Why It Matters Here
A shop that assembles engines from bare blocks knows exactly what a dying one sounds like — which means your diagnosis is based on what's actually wrong, not a parts-cannon guess.