ok so here we go I have an 04 g35 for the past couple days I have had a no start issue where the car just died today finally started and threw out a code for cylinder 5 I pulled the coil saw it was melting so I promptly replaced it after new one was installed I started her back up and within the 5 seconds it took to walk from the ignition to the front of the car the new coil pack was starting to melt and was smoking need help its possible I'm thinking I could have a bad ecu anyone here ever experience this????????

old coil


new coil

 

You using oem coils or shirt aftermarket ones??

 

ecu doesnt send voltage. just signal. even at constant rate your coil shouldnt melt. not saying it cant, just saying it shouldnt. most likely cause is a short in the harness.

 

Follow the troubleshooting steps in the FSM

http://www.nicoclub.com/FSM/G35/Sedan/2004/ec.pdf

"The engine has an ECM to control major systems such as fuel con-
trol, ignition control, idle air control system, etc. The ECM accepts
input signals from sensors and instantly drives actuators. It is essen-
tial that both input and output signals are proper and stable. At the
same time, it is important that there are no malfunctions such as vac-
uum leaks, fouled spark plugs, or other malfunctions with the engine...."

See diagram on page EC 92

I'm wondering if a shorted #5 spark plug could be the cause of your problem?

It might be more economical to let an Infiniti dealer find the root cause of your problem?

With a sixteen year old vehicle perhaps its time for a new one?
A new one comes with all new parts and a warranty

Good luck

Telcoman

 

]

 

No it wasnt an aftermarket coil it was oem and no im not getting a new car ive put allot if work into this car new engine new transmission its ran for 2 years an this is the first time ive ever had an issue. Telco thanks ill look into this info an see what i can come up with.

 

I'd try replacing the spark plug and see if that fixes the issue. Cheap possible fix even if it doesn't work.

 

Hey was this issue solved?

I had the same thing happen but not the car doesn't start at all and #2 coilpack gets super hot while trying to start it.

 

It gets hot due to probably shorted windings?

Measure the resistance from a good one to compare

Telcoman

 

I will test resistance soon, but noob question first... what is a winding? lol

 

A winding is part of a coil inductor. Switching 12v on and off rapidly induces a high voltage in the secondary winding to generate the high voltage necessary to fire a spark plug.
This part is known as a coil pack. One required for each cylinder

http://www.nicoclub.com/service-manu.../Sedan/2004/ec

See page EC 590

You may want to consider having a pro diagnose your problem.

http://www.carsdirect.com/car-repair...ulty-coil-pack

Telcoman

 

Possibly a short or blown fuse