No spark

Tiny
HARRYLENZYW
  • MEMBER
  • 2011 DODGE CHARGER
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 215,000 MILES
I saw a light spark once, but nothing after.
I drove car into my garage to do some work on it. I replaced the following items: spark plugs, fuel injectors, PVC, MAP, camshaft sensor, crankshaft sensor, knock sensors and fuel pump.
Monday, August 2nd, 2021 AT 12:28 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi,

I noticed you replaced the fuel pump along with other things. Are you not getting fuel either?

Let's start simple. I attached pics of the power distribution box and legend. This box is under the hood. I need you to check the two fuses I highlighted and the relay I highlighted.

When checking the fuses, first make sure they are good. If they are, next confirm there is power to and from them. Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

The ASD relay needs to be checked as well. ASD stands for automatic shut down. This shits the engine down in the event of an accident.

There are two things you can do. First, see if there is a different relay in the box that has the same part number and switch them to see if it makes a difference. If there isn't, here is a link that explains how to test a relay:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Just a little overview. On each of the coils, you will find two wires. Every coil will have a brown wire with a yellow tracer. If you find that the relay and fuses are good, I need you to disconnect one coil at a time and see if there is power to that wire. When the key is in the start position, that wire on each coil should have power. You can use a basic test light to check for power, If there is none and fuse 35 is good in the fuse box, we have an open circuit between the two points.

The other wire at the coil will be different for each coil. Those wires go to the powertrain control module (PCM). When it is time for the coil to spark, the PCM provides a ground path for those wires to complete the circuit and trigger the coil.

Let me know what you find or if you have other questions.

Take care,

Joe

See pics below.
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Monday, August 2nd, 2021 AT 9:24 PM

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