Spark Plug Replacement at your home or office in Hercules.

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Service Area

Average rating from customers who
received a Spark Plugs Replacement.
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$96.47 - $642.49

Price range for all vehicles


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Average rating from customers who
received a Spark Plugs Replacement.
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Recent Spark Plug Replacement reviews in Hercules

Excellent Rating


YourMechanic Spark Plug Replacement Service

Average Rating

4.9/5

Number of Reviews

3,540

Rating Summary
3,332
125
16
15
52
3,332
125
16
15
52

Michael

14 years of experience
495 reviews
Michael
14 years of experience
Michael was on time and did an outstanding job replacing my spark plugs.
Michael is my guy...I request him all the time...when he's available. Knows his stuff & gets the job done.

Tony

12 years of experience
121 reviews
Tony
12 years of experience
At my first visit, Tony explained that he could make the needed repairs but that I would be better off going directly to the dealer. After taking his advice, the repairs needed were covered at 100%, due to one of Toyota's class action lawsuits. I appreciate that he gave me honest advice, even though he could have easily sold me into doing the repairs himself. He has checked on my cars twice now, and both times he gave me good advice on saving money and proper ongoing maintenance. (Side note: After speaking with him, I learned that he also buys, sells and fixes cars. In addition, he was formally trained as an engineer and can pretty much take apart and put anything back together. I feel very lucky to have met someone that knowledgeable to help with our family vehicles). Thank you, Tony!

Gary

25 years of experience
226 reviews
Gary
25 years of experience

Joshua

25 years of experience
709 reviews
Joshua
25 years of experience
The car runs great! Thank you!

Theodore

14 years of experience
1066 reviews
Theodore
14 years of experience
Another great appointment with Theodore. He did a great job and was flexible to handle some unexpected problems.

Robert

8 years of experience
8 reviews
Robert
8 years of experience
He was very helpful and knowledgeable and got the job done in a timely manner

Robert

40 years of experience
232 reviews
Robert
40 years of experience
Good job done in a timely manner. Called when he was 1/2 hours away and arrived on time.

Andrew

9 years of experience
537 reviews
Andrew
9 years of experience
Wonderful and very knowledgeable

John

34 years of experience
314 reviews
John
34 years of experience
John is knowledgable, easy going and trustworthy. Everything you want in a mechanic.

Kenneth

18 years of experience
487 reviews
Kenneth
18 years of experience
Kenneth was right on time, friendly, and very competent. He clearly described the repairs he performed and kindly helped me to understand how to keep my car performing well.


How much does Spark Plug Replacement cost in Hercules?

It depends on the type of car you drive and the auto repair shop you go to in Hercules. Our mechanics in Hercules are mobile, which means they don't have the overhead that repair shops have. They provide you convenience by coming to your home or office in Hercules.

Cars Estimate Parts Cost Labor Cost Savings Average Dealer Price
2010 Subaru Outback $233 $80.56 $151.98 18% $284.81
2007 Saturn Aura $174 $86.28 $87.98 14% $204.53
2009 Subaru Tribeca $448 $216.28 $231.97 15% $528.03
2011 BMW X3 $192 $96.00 $95.98 14% $225.00
2008 Cadillac Escalade $353 $208.67 $143.98 12% $402.17
2011 Jaguar XK $558 $269.85 $287.96 15% $656.85

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Spark Plug Replacement Service

What are spark plugs and how do they work?

Spark plugs are one of the key components of your vehicle’s ignition system. They ignite gasoline and air inside of your engine. This gives your engine the power to propel you down the road. The spark plug takes high voltage electricity from the ignition coil and creates a spark at just right moment during the engine’s combustion cycle. This gives the engine the best mix of power, fuel economy and low emissions. However, the electrode at the end of the spark plug eventually wears out and can cause performance issues.

Spark plugs-MATROX-1

When should you replace spark plugs?

Replacement should follow the vehicle maintenance schedule. This will be listed in the vehicle’s owner’s manual. Some cars require regular replacement at 30k, 60k or 100k miles. It is possible in some cases that a spark plug might fail before the service schedule, but it’s not typically common.

Avoiding spark plug replacement can cause:

  • Difficulty starting your car.
  • Check engine light for a misfire code.
  • Flashing check engine light during acceleration for misfire, this can cause engine damage.
  • Reduced fuel economy and/or power.
  • Rough idle and/or unexplained engine vibration.
  • Failed State emission testing.

Even if only one spark plug is found to be faulty, they should always be replaced in sets. Most engines will require 4,6, or 8 spark plugs.

How do mechanics replace spark plugs?

Spark plugs are threaded into the engine’s cylinder head(s). Most cars have one plug per cylinder, so a four-cylinder engine will have four plugs, a six-cylinder engine will have six plugs, and so forth. The mechanic will:

  • Have the correct spark plugs on hand for your vehicle
  • Pull any diagnostic trouble codes that may be related to worn spark plugs.
  • Remove the original spark plugs and look at removed spark plugs for any clues indicating engine mis-operation exists; such as oil burning, excessively rich mixture, pre-ignition damage etc. Inform owner of any found unusual conditions.
  • Install new plugs using a torque wrench.
  • Finally, a road test of the vehicle to confirm normal operation.

Is it safe to drive with worn spark plugs?

Yes, but spark plugs that are worn enough to cause engine-misfiring have the potential to cause engine damage and overheating of the catalytic converter. Regardless of the age of the plugs, or mileage, if the engine misfires or runs poorly, the plugs should be inspected for defects. Generally, spark plug failure will not keep the engine from running, but in cases of extreme wear, you may experience a limitation in the speed at which you can drive the car. If the maintenance schedule says the plugs should be replaced, it is best to do so promptly.

When having spark plugs replaced keep in mind:

  • High-speed driving may accelerate spark plug wear. Consider earlier than required inspection and tune-up if you operate the car in severe conditions.
  • Plugs should always be promptly replaced per the manufacturer maintenance schedule even if they appear to be working perfectly.
  • If your vehicle is equipped with spark plug wires (as opposed to a coil-on-plug system), the wires should be replaced at the same time. This may increase the cost of your repair.
  • It is possible that when doing a spark plug replacement, your vehicle may also need additional parts like ignition coils, this will add to the repair cost.
  • Some engines require that the intake manifold be removed while replacing spark plugs. This may increase the parts and labor cost for the repair.
  • Leaking valve cover gaskets, which have let oil get in contact with the spark plugs, coils or wires, may be the cause of ignition system issues. Valve cover gaskets will need to be replaced in addition to the spark plugs, wires or coils. This will add to the repair cost.

Fast and easy service at your home or office

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Backed by 12-month, 12.000-mile guarantee


How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com