Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Ignition Module
The ignition module monitors input signals from several engine sensors. Input from the combination sensor is used by the ignition module to determine when to trigger the No. 1/4 coil pack. On 3.8L models, module passes this signal on to the ECM so that sequential fuel injector timing can be initialized.
At engine speeds less than 400 RPM, the ignition module controls spark advance by triggering each of the 3 coils at a predetermined interval based on engine speed only. At engine speeds greater than 400 RPM (EST mode), the ECM compensates for all driving conditions. On 3.8L engines, when in EST mode, ECM also changes fuel injection timing to a sequential mode. The ignition module is located directly below the ignition coil pack.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
No obligation. See pricing before you book.