Car stays running when off? Get your car inspected at your home or office.

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How much does Car stays running when I shut the key off Inspection cost?

It depends on the type of car you drive and the auto repair shop you go to. Our mechanics 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.

YourMechanic Price
$70 to $80
Labor: $70 -$80
Parts: $0
Average Dealer price
$93
Average Shop price
$83
Get an instant quote for your car
Our mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing
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ServiceYourMechanic PriceShop/Dealer Price
Car stays running when I shut the key off Inspection for 1967 Ford Mustang V8-4.7LYourMechanic Price$70.00Shop/Dealer Price$106.30 - $133.53
Car stays running when I shut the key off Inspection for 1966 Buick Sportwagon V8-5.6LYourMechanic Price$70.00Shop/Dealer Price$84.59 - $95.53
Car stays running when I shut the key off Inspection for 1977 Pontiac Bonneville V8-6.6LYourMechanic Price$70.00Shop/Dealer Price$84.54 - $95.45
Car stays running when I shut the key off Inspection for 1961 Chevrolet K10 Pickup V8-4.6LYourMechanic Price$70.00Shop/Dealer Price$84.56 - $95.49
Car stays running when I shut the key off Inspection for 1968 GMC P35/P3500 Van L6-4.8LYourMechanic Price$70.00Shop/Dealer Price$84.53 - $95.43
Car stays running when I shut the key off Inspection for 1980 Plymouth Colt L4-1.6LYourMechanic Price$70.00Shop/Dealer Price$84.52 - $95.40
Car stays running when I shut the key off Inspection for 1977 Dodge Royal Monaco V8-5.9LYourMechanic Price$70.00Shop/Dealer Price$84.61 - $95.56
Car stays running when I shut the key off Inspection for 2007 Ford Mustang V8-4.6LYourMechanic Price$70.00Shop/Dealer Price$106.46 - $133.81
Show example Car stays running when I shut the key off Inspection prices

Car stays running when I shut the key off Inspection Service & Cost

We’ve all heard a car continuing to run after the ignition key has been turned off, and it usually sounds pretty bad, with all kinds of clonking and coughing noises. These days, though, you’re more likely to hear this in the movies, when sound-effects staff is trying to show the viewers what a clunker this particular actor is driving. Modern cars are seldom afflicted with this particular problem.

The phenomenon often called “dieseling” is caused by a condition known as pre-ignition, where hot spots in the engine’s combustion chamber fire the compressed fuel mixture without needing a spark. This syndrome can also be present when the car is running under load, producing a characteristic – and potentially damaging – pinging sound.

What is actually happening is the fuel charge exploding all at once instead of burning across a moving flame front away from the spark that normally initiates combustion. Also known as detonation, the sudden explosion is often caused by the use of a too-low octane-rated fuel.

If this is happening to your car, it’s probably an old one with carburetors. New models all use electronic fuel injection, which shuts down when the key is switched off. Without fuel going to the cylinders, there can be no running on. Carburetors, however, will continue to supply fuel as long as the engine is turning over.

Because this phenomenon often occurs in older cars with a higher build up of carbon deposits in the engine, you may need to use a higher octane fuel than was originally specified. If this fails to quell the running-on mischief, then a tune up and possible replacement of spark plugs with a colder heat range may be called for.

Replacing your intake side valve stem seals may sometimes correct this issue as well.

Common reasons for this to happen:

  • Ignition timing is off
  • Broken lock cylinder
  • Bad intake side valve stem
  • Bad spark plugs

What to expect:

A top-rated mobile mechanic will come to your home or office to determine the source and cause of the running-on issue, and will then provide a detailed inspection report that includes the scope and cost of the necessary repairs.

How important is this service?

A running-on car is not only a waste of energy and fuel, it also presents a potentially dangerous situation. Book a mechanic to diagnose the issue as soon as possible.

Fast and easy Car stays running when I shut the key off Inspection service at your home or office.

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Meet some of our expert mechanics

Real customer reviews from owners like you.

64 reviews
Brian
8 years of experience
Great experience with Brian getting an oil change done!
2011 KIA RIO - OIL CHANGE
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55 reviews
Chris
6 years of experience
Chris was on time and did job well
2004 HONDA ACCORD - AC IS NOT WORKING INSPECTION
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23 reviews
Archie
19 years of experience
Archie was very methodical in his diagnosis to get my 1999 Civic started, walked me thru each stage and was very friendly in answering all my questions. I would highly recommend him to anyone.
1999 HONDA CIVIC - CAR IS NOT STARTING INSPECTION
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15 reviews
David
32 years of experience
Awesome job, extremely knowledgeable and very efficient
1993 TOYOTA T100 - ALTERNATOR / SERPENTINE BELT REPLACEMENT
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Get an instant quote for your car
Our mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing
Get a quote
ServiceYourMechanic PriceShop/Dealer Price
Car stays running when I shut the key off Inspection for 1967 Ford Mustang V8-4.7LYourMechanic Price$70.00Shop/Dealer Price$106.30 - $133.53
Car stays running when I shut the key off Inspection for 1966 Buick Sportwagon V8-5.6LYourMechanic Price$70.00Shop/Dealer Price$84.59 - $95.53
Car stays running when I shut the key off Inspection for 1977 Pontiac Bonneville V8-6.6LYourMechanic Price$70.00Shop/Dealer Price$84.54 - $95.45
Car stays running when I shut the key off Inspection for 1961 Chevrolet K10 Pickup V8-4.6LYourMechanic Price$70.00Shop/Dealer Price$84.56 - $95.49
Car stays running when I shut the key off Inspection for 1968 GMC P35/P3500 Van L6-4.8LYourMechanic Price$70.00Shop/Dealer Price$84.53 - $95.43
Car stays running when I shut the key off Inspection for 1980 Plymouth Colt L4-1.6LYourMechanic Price$70.00Shop/Dealer Price$84.52 - $95.40
Car stays running when I shut the key off Inspection for 1977 Dodge Royal Monaco V8-5.9LYourMechanic Price$70.00Shop/Dealer Price$84.61 - $95.56
Car stays running when I shut the key off Inspection for 2007 Ford Mustang V8-4.6LYourMechanic Price$70.00Shop/Dealer Price$106.46 - $133.81
Show example Car stays running when I shut the key off Inspection prices

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