Skip the auto shop - Our mechanics make house calls

Q: Why would a truck crank but not start until a plug wire is removed?

asked by on

My truck would not start this morning. It would turn over but wouldn't start. I pulled the plug wire to test for a spark, got it to spark then it started. Shut the engine off, plugged the wire back in, waited a few minutes and it wouldn't start again. Pulled the wire again, and it started yet again. What would cause it to do this?

My car has 130000 miles.
My car has an automatic transmission.

A: The engine may have a shorted spark plug th...

The engine may have a shorted spark plug that is shorting the coil out. I would recommend replacing the spark plugs first then replace the coil pack if it continues to not start. If you need help with this, a certified professional from YourMechanic can diagnose the starting issue and help perform any of these services for you.

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: Honda Prelude 1993; Car won't start and I smell gas.

Hello. From what you are explaining it sounds like you may have a failing fuel injector. Most of the time when you have a running condition like this it is due to an issue with a fuel injector being stuck...

Q: Cylinder 6 misfiring

Since you have already replaced the plugs and wires, that narrows down what the problem could be. The most likely culprits of your issue are a faulty fuel injector or ignition coil. However, there is a slight chance that there...

Q: My engine is having a hard time starting.

Hi there. Check the battery cables to see if they are tight and clean. Check the wire and make sure that there is no corrosion (looks green on the wires). Check the battery voltage after the vehicle has sat all...

Related articles

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...
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.
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.