Should I change/replace coils too?

[tfeni52355]

My 2016 Longhorn has 107,000 miles on it and I am going to change the plugs. Should I replace the coils while I am replacing the plugs?

 

[rzr6-4]

Only if yours are causing problems. Even then you may be able to clean it out.

 

[EdGs]

Coils on our Rams are very stout.

My '15 has almost 214k on them.

 

[Nick@GotExhaust]

I would leave them unless you are having issues

 

[Ken226]

Should I replace the coils while I am replacing the plugs?

No.

 

[Wild one]

My 2016 Longhorn has 107,000 miles on it and I am going to change the plugs. Should I replace the coils while I am replacing the plugs?

Only if you plan on buying new OEM coils,as the aftermarket ones from RIPP /MSD etc. have a terrible rep.
You can spend an hour or so cleaning them up,and if the springs inside the boots are in really bad shape,you can buy new boots with springs from Rock Auto

Coil cleaning pics

Yea i know my picture taking abilities suck,lol Hopefully you guys can tell how i go about cleaning up the coils from the pic's. The first pic,is just a pic of everything disassembled.If your truck has the resistors under the spring in the coil towers,you'll want to remove them and clean them...

www.ramforum.com

 

[Zoe Saldana]

YES.

I went with NGK plugs and coils.

Coils degrade over time.

I kept an old coil in case of an emergency, like I did with the old serpentine belt.

Yes, spark plug coils (ignition coils) degrade over time due to heat, vibration, and electrical stress, typically lasting between 80,000 to 100,000+ miles (roughly 5–7 years). While they can last the life of some vehicles, they often fail sooner if overworked by worn-out spark plugs, causing engine misfires, rough idling, or reduced fuel economy. [1, 2, 3, 4]
Common Causes of Degradation & Failure

• Heat & Vibration: Constant engine heat degrades the insulation and internal windings.
• Worn Spark Plugs: Increased gap in old spark plugs requires higher voltage to fire, forcing coils to work harder and overheat.
• Cracked/Torn Boots: The rubber boot on coil-on-plug designs can crack, letting electricity escape before reaching the plug. [1, 2, 3, 4, 5]

Signs of Failing Ignition Coils

• Check Engine Light: A flashing check engine light often indicates an active misfire.
• Rough Idle & Poor Acceleration: Engine shakes at stoplights or hesitates upon acceleration.
• Reduced Fuel Economy: Inefficient spark leads to increased fuel consumption. [1, 2, 3, 4, 5]

 

[Wild one]

YES.

I went with NGK plugs and coils.

Coils degrade over time.

I kept an old coil in case of an emergency, like I did with the old serpentine belt.

Yes, spark plug coils (ignition coils) degrade over time due to heat, vibration, and electrical stress, typically lasting between 80,000 to 100,000+ miles (roughly 5–7 years). While they can last the life of some vehicles, they often fail sooner if overworked by worn-out spark plugs, causing engine misfires, rough idling, or reduced fuel economy. [1, 2, 3, 4]
Common Causes of Degradation & Failure

• Heat & Vibration: Constant engine heat degrades the insulation and internal windings.
• Worn Spark Plugs: Increased gap in old spark plugs requires higher voltage to fire, forcing coils to work harder and overheat.
• Cracked/Torn Boots: The rubber boot on coil-on-plug designs can crack, letting electricity escape before reaching the plug. [1, 2, 3, 4, 5]

Signs of Failing Ignition Coils

• Check Engine Light: A flashing check engine light often indicates an active misfire.
• Rough Idle & Poor Acceleration: Engine shakes at stoplights or hesitates upon acceleration.
• Reduced Fuel Economy: Inefficient spark leads to increased fuel consumption. [1, 2, 3, 4, 5]

Dodge coils don't have a rep of failing,but the aftermarket coils from RIPP/MSD/NGK etc,.do have a rep of failing.There's a reason why the high performance shops run the stock coils on builds well north of a 1,000 hp. They'll fire the plugs under high cylinder pressures while the majority of cheap aftermarket coils don't. You have to spend alot of money on aftermarket coils before you get ones that actually make more power then the factory coils do. A little maintence on your original coils goes along ways to keeping them healthy and firing plugs for a couple hundred thousand miles.
Ma Mopar has their coils pretty well scienced out,and no one in the aftermarket has the money Ma Mopar has to spend on coils.If there was more power and longer life to be had from a coil Ma Mopar would of found it,as coils are 1 way to gain milege and lower emissions

 

[DCunited]

I went with NGK plugs. Buy them where you know they are real (Napa, not ebay) . My first set was not real and luckily I noticed the smeary ink before I broke my nuckles. I chose not to replace coils @ 100k now 150k and it purs like a calico kitten.

 

[DILLIGAF]

aftermarket coils for the hemi are a waste of money. This is from the guy that hates OEM anything

 

[Chuckster]

I have a question for the group regarding coils, I recently bought a 2019 Ram Classic 4X4 with the 5.7 HEMI, currently has 82k on it. I previously owned a 2012 Charger SRT Super Bee with the 392 HEMI. I replaced the coil packs on the Charger with Sultan Of Spark coil packs and kept the factory coil packs. They have about 25k of use on them. Would the 392 coil packs work on my 5.7, if I need to replace them?
Thanks!

 

[Tominator223]

Got over 20yrs & 300,000 miles out of my 04 5.7 coils

 

[Wild one]

I have a question for the group regarding coils, I recently bought a 2019 Ram Classic 4X4 with the 5.7 HEMI, currently has 82k on it. I previously owned a 2012 Charger SRT Super Bee with the 392 HEMI. I replaced the coil packs on the Charger with Sultan Of Spark coil packs and kept the factory coil packs. They have about 25k of use on them. Would the 392 coil packs work on my 5.7, if I need to replace them?
Thanks!

They'll work but they're not the good factory coils.To get the better coils,you want the coils from 2014 and newer vehicles.When they switched over to Irridium plugs,they also upgraded the coils with more windings,so they create a stronger spark.
If you ever end up with a dead coil,they'll work as a stop gap coil to get you up and running,but i wouldn't be using them unless you actually need to replace a coil.
If you do a little maintence on your stock coils,they'll probably out last the truck.

Coil cleaning pics

Yea i know my picture taking abilities suck,lol Hopefully you guys can tell how i go about cleaning up the coils from the pic's. The first pic,is just a pic of everything disassembled.If your truck has the resistors under the spring in the coil towers,you'll want to remove them and clean them...

www.ramforum.com

 

[Chuckster]

Good advice, thanks Wild one!

 

[Wild one]

Good advice, thanks Wild one!

If you ever think you have a bad injector,you can clean them and check their flow pattern pretty easily at home.
There's a video in the first post that's basically a carbon copy of how i've been cleaning the injectors for years

Injector cleaning

Supposed to go cold and snow for the next 10 days,so i figured it was a good time to pull the injectors and give them a cleaning.Got them soaking in injector cleaner,where i'll probably leave them for a couple days before using some carb and choke cleaner to wash them out using my old homemade...

www.ramforum.com

The Hemi's are famous for losing intake manifold bolt torque,and are worth checking fairly often.

Check your intake manifold bolts

This hasn't been talked about for awhile,but check your intake manifold bolts.They call for 108 in-lbs or roughly 9 ft-lbs of torque,and they should be checked at least yearly,as they do loosen up. I've been doing mine at least twice a year on all 3 of of my hemi equipped vehicles.They should be...

www.ramforum.com