Tech Tip of the Week | Encks Auto Repair By Paul Enck | Call: 727-822-1
This week Paul has a vehicle in the shop with 160,000 miles on it and not a single tune-up in its lifetime. Everything that should have been serviced gradually along the way now needs to be replaced all at once — and the bill reflects it.
“This vehicle has 160,000 miles on it and it’s never been tuned up. Instead of costing 600 dollars, a tune-up probably would have cost 300. Everything in it is shot so it’s all got to be replaced.”
— Paul Enck, Encks Auto Repair
Paul pulls the plugs and the condition speaks for itself. Heavy deposits on every plug, worn tips, and on one plug the electrode is completely gone — nothing left but the insulator.
“This one here — the whole end is gone. If you look at it there isn’t anything but a tip of the insulator left on it.”
— Paul Enck, during live inspection
He then holds up a fresh plug alongside the worn ones. The difference is stark — a sharp clean tip, no deposits, ready to deliver a proper spark to the combustion chamber.
The ignition wires on this vehicle are original — as old as the car itself. On a properly maintained vehicle they would have been replaced long ago. At this point they are contributing to the same misfiring and performance loss as the plugs.
This is where the consequences of neglect become most serious. Paul cuts open the old fuel filter to show what is inside.
“The fuel filter in this vehicle is plugged solid. The material in here is black — it should be more of a cream color. This filter was restricted to the point that we couldn’t even blow through it. Yet the vehicle barely made it to the shop.”
— Paul Enck, Encks Auto Repair
A plugged fuel filter starves the engine of fuel and forces the fuel pump to work far harder than it was designed to. And the fuel pump on this vehicle sits inside the fuel tank.
“When the filter is restricted, the fuel pump can’t deliver fuel properly to the engine. The fuel pump in this vehicle is probably 400 to 500 dollars. It’s in the fuel tank.”
— Paul Enck, Encks Auto Repair
A twenty dollar fuel filter changed in ten to fifteen minutes during an oil change could have protected a five hundred dollar fuel pump. That is the real cost of skipping it.
On top of everything else, the battery on this vehicle has visible corrosion buildup on the terminals — green deposits that restrict the electrical connection and put additional strain on the charging system.
“If it had been maintained throughout its time, it would probably be getting anywhere from four to five more miles per gallon — and instead of costing 600 dollars, the tune-up probably would have cost 300.”
— Paul Enck, Encks Auto Repair
Every item on this vehicle that is now being replaced could have been serviced gradually at a fraction of the total cost. The pattern is consistent across all of them — small, inexpensive services skipped over time compound into a large, unavoidable repair bill.
Pro Tip: A fuel filter is a twenty dollar part that takes fifteen minutes to change during an oil service. A fuel pump is a five hundred dollar part that requires dropping the fuel tank to replace. The choice between the two is made every time you skip a service.
1. How often should spark plugs be replaced?
Copper plugs every 30,000 miles, platinum plugs every 60,000 miles, and iridium plugs up to 100,000 miles. Check your owner’s manual for the interval specific to your vehicle. Staying on schedule prevents the kind of severe wear Paul shows in this Tech Tip.
2. How often should a fuel filter be replaced?
Most vehicles benefit from a fuel filter replacement every 20,000 to 30,000 miles. It is an inexpensive service that protects the fuel pump and injectors from contamination and restriction. Ask your shop to include it as part of a complete oil change service.
3. What are the symptoms of a clogged fuel filter?
Hard starting, hesitation during acceleration, stalling at low speeds, rough idling, and a general lack of power are all common signs. In severe cases — like the vehicle Paul describes — the engine can barely run at all.
4. Can a clogged fuel filter really damage the fuel pump?
Yes. When the filter is restricted, the fuel pump has to work much harder to pull fuel through it. That extra strain generates heat and accelerates wear on the pump’s internal components, significantly shortening its lifespan.
5. How much does a fuel pump replacement typically cost?
On vehicles where the pump is located inside the fuel tank — which is most modern vehicles — replacement generally runs between 400 and 600 dollars including labor. Keeping the fuel filter clean is the single most effective way to protect it.
6. What does a worn spark plug actually do to engine performance?
A worn plug fires inconsistently or not at all, causing misfires that reduce power, increase fuel consumption, and over time damage the catalytic converter. The engine management system tries to compensate but cannot fully make up for a plug that is no longer functioning properly.
7. How do I know if my ignition wires need replacing?
Symptoms include rough idling, misfires, poor acceleration, and reduced fuel economy — similar to worn spark plugs. A shop can test wire resistance with a multimeter to confirm whether they are within specification. On high mileage vehicles they are typically replaced as part of a complete tune-up.
8. Does a tune-up really improve fuel economy?
Yes. As Paul notes, a properly maintained engine can deliver four to five more miles per gallon compared to one running on worn plugs, dirty filters, and degraded wires. Over thousands of miles that adds up to a meaningful saving at the pump.
9. What is typically included in a complete tune-up?
A full tune-up generally covers spark plugs, ignition wires or coil boots, air filter, fuel filter, PCV valve, and a inspection of belts, hoses, and battery condition. The exact scope depends on the vehicle’s age, mileage, and what the inspection reveals.
10. Is it worth doing a full tune-up on a high mileage vehicle?
In most cases yes — provided the engine itself is in reasonable condition. A tune-up restores performance and fuel economy, protects more expensive components downstream, and is almost always cheaper than the repairs that follow from continued neglect. Paul’s example makes the case clearly: 300 dollars of gradual maintenance versus 600 dollars all at once when everything fails together.
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