Skip the auto shop - Our mechanics make house calls

Q: Car misses under load

asked by on

My car misses when it is under load.

A: Hi there. A miss under load indicates a sec...

Hi there. A miss under load indicates a secondary ignition problem. Your ignition system is divided into two components: the primary and secondary. The primary side of the system includes low voltage items including the battery, ignition switch, control module, crankshaft sensor and primary coil windings. The secondary side of the system includes the secondary coil windings, spark plug wires and spark plugs. The control module interrupts current flow through the primary windings of the coil to create the high voltage needed to fire the spark plugs. A problem with the plugs, wires or coil pack will produce a misfire under load and store a diagnostic trouble code in the control module’s memory. A trained technician will use this code as a starting point to diagnose your vehicle. I suggest you have the team at YourMechanic properly fix your vehicle.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: My car automatic shuts down and when it starts again black smoke come out heavy from muffler.

Hi there. Check the ignition system on your vehicle and see when the last time your vehicle has had a tune-up. I recommend replacing the spark plug wires and plugs with the factory design plugs and cleaning the fuel injection...

Q: Car Wont Start

I would recommend having your battery checked to make sure that it can hold a charge. If the alternator is brand new it should be charging the battery just fine but if the battery is faulty and is no longer...

Q: Car won't start unless jumped - 2005 Dodge Grand Caravan

Hello. At first it definitely sounds like the battery may have failed. Have you had this tested? If the battery will not hold a charge, you may technically be running on the alternator when driving. You should also get a...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.