Q: 4T65E just replaced 08 Lucerne 3.8L, replaced plugs/wires/1 coil pack melted at #4 so replaced it now rough idle

asked by on

Should I now replace the #4 and #1 plugs and wires because of the coil pack meltdown? I appreciate your help.

My car has 68000 miles.
My car has an automatic transmission.

The coil pack melts down for a reason and cause will need to be diagnosed what caused it. The most common cause is a short in the signal wire or excessive resistance in the plug wires or plugs. I recommend replacing plugs and wires and then if it still runs bad then check to see if coil is getting hot. If it is then the coil is shorting due to signal wire from computer is keeping the coil energised and overheating it. You may have a computer circuit fault and would need to have the wires checked for shorts or the computer may need replaced.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. 4T65E just replaced 08 Lucerne 3.8L, replaced plugs/wires/1 coil pack melted at #4 so replaced it now rough idle

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: Q: What is wrong with my car?

A flashing check engine light means that there is a problem that may damage the car if you continue to drive. Most often it comes on when there is a misfire, and the potential damage is damage to the catalytic...

Q: ABS and Service Traction Control lights on

Hello. Typically when both of these come on at the same time it is because of a failing wheel speed sensor. I would start though by checking the brake fluid level, as low brake fluid can also cause this. If...

Q: My 2003 buick century will not shift out of 1st gear and speedometer doesnt work. Can you send a machanic

Hi there. You can request to have one of our mobile mechanics come to your location and complete a car is hard to shift inspection to determine what is causing this problem by clicking this link. It is possible that...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...