Gas Engine Issues We See at the Shop (And What You Can Do About Them)
Out here in the cornfields, we see a little bit of everything roll into the shop—trucks, cars, SUVs, you name it. Most of them run on good old gasoline engines. And while each job has its quirks, there are a few issues that come up time and time again. So we figured we’d take a few minutes between oil changes and carb cleanings to share what we see most often—and how you can stay ahead of the worst of it.
⛽️ Fuel System Problems
Probably the most common trouble we run into is with the fuel system. Whether it’s bad gas, a clogged fuel filter, or a failing fuel pump, this stuff can sneak up on you.
Why it happens:
Gasoline degrades over time, especially if your vehicle or equipment sits for weeks or months without running. Old gas gums up carburetors and injectors. Add a little moisture or dirt in the tank, and you’ve got a recipe for hard starts or no-starts.
What you can do:
Use fresh gas—avoid using anything older than a couple of months unless it’s treated with stabilizer.
Run your equipment regularly, even during the off-season.
Change fuel filters on schedule, and drain old gas when putting machines into storage.
🔌 Ignition System Issues
When an engine cranks but won’t fire, one of the first places we check is spark. Worn-out spark plugs, faulty ignition coils, or a bad distributor cap (on older models) are usual suspects.
Why it happens:
These parts wear down over time, especially in dusty or wet environments—like the kind we have around here.
What you can do:
Keep up with regular maintenance—change plugs and wires as recommended.
If your engine’s misfiring or running rough, don’t wait—get it checked. Ignition problems can quickly snowball into bigger issues.
🌡️ Overheating
Engines running hot or blowing coolant are a sure sign something’s wrong. Around here, folks sometimes push their equipment hard on hot summer days—and the cooling system gets overwhelmed.
Why it happens:
Common culprits are low coolant, stuck thermostats, broken fans, or clogged radiators. Sometimes it’s a slow leak that’s gone unnoticed until the temp gauge starts climbing.
What you can do:
Check your coolant level regularly.
Inspect hoses and radiator for leaks, rust, or debris buildup.
Don’t ignore the temp gauge—shutting the engine down early can save it from serious damage.
🧠 Sensor Failures & Computer Glitches
Even basic gas engines these days rely on a maze of sensors to run right—oxygen sensors, throttle position sensors, MAF sensors, and more. When one goes haywire, it can throw off the whole system.
Why it happens:
Sensors get dirty, fail with age, or get damaged from engine heat or moisture. A check engine light or rough running is often the first sign.
What you can do:
If your check engine light comes on, don’t ignore it. It may be something simple—but it’s best to get it diagnosed early.
Keep electrical connectors clean and dry, especially on equipment stored outdoors.
⏱️ Timing Issues
Engines that sputter, stall, or make knocking noises could be suffering from timing problems—whether it’s a worn timing belt/chain or a sensor throwing things off.
Why it happens:
Timing belts don’t last forever, and a broken one can leave you stranded—or worse, wreck your engine if it’s an interference type.
What you can do:
Know your vehicle’s recommended timing belt replacement interval—and stick to it.
If your engine sounds “off” or has lost power, don’t wait. Timing-related damage can be expensive.
Final Thoughts
We’ve been turning wrenches long enough to know that small problems have a way of becoming big ones if left alone. A little preventive maintenance goes a long way—especially with gas engines. Whether it’s your daily driver, your prized classic or the beat up farm truck keeping it running comes down to regular care and paying attention to how it behaves.
If you’re not sure what that noise is, or why your engine doesn’t feel quite right, stop by. We’ll take a look, shoot you straight, and get you back up and running.
Until then, keep your gas fresh, your filters clean, and your ears open.
Need service? Give us a call at (815) 699-2641 or swing by the shop. We’re just a mile off of Wyanet-Walnut blacktop, right in between Walnut and Wyanet; keep an eye out for our sign at the corner of 2100 North Ave!
Proudly keeping Bureau County’s gas vehicles, old and new, rolling.