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: What repairs fix codes P0172 and P0304? I just had all the spark plugs replaced recently.

The P0304 code indicates a misfire has been detected on cylinder 4. The P0172 code indicates that the fuel mixture is richer than the mixture control can compensate for. It's possible that they are related, but not necessarily. Rich mixture...

Q: Car sounds like its not getting fuel cranks normal. Fuel pump is working. Fuses and relays good. crank no start. No codes

Hi There, Try starting the car and if it does not start, turn the key off and then pull one of the spark plugs out to see if it is wet with fuel. If the spark plug is dry, then...

Q: My car is overheating

The cooling system caused the overheating and may have caused the engine to blow a head gasket. You will need to have the system pressure tested to see if there is a pressure loss to the head gasket. If no...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.