4g63 Coil On Plug 201

This is a continuation from my earlier coil-on-plug how-to video. I was troubleshooting an ignition problem where I couldn't boost over 14 PSI without misfiring or backfiring despite having an ignition amplifier, and this is what worked to completely resolve my troubles.

There's lots of information about what parts work well on a 4g63 (and their relevance) as well as lots of reports about people having ignition problems once they're installed. I noticed that there's not really any instruction available regarding ideal methods for trimming the longer Chrysler boot down to the size and shape for a 4g63 setup. Some of this could be due to the depth of various COP mounting plates, but this video is intended as an effort to help fill that void regardless of why.

If the boots are not trimmed properly, then as combustion chamber pressure increases, the possibility of the spark arcing from the plug into the plug well is possible. This can happen on improperly insulated plugs, or as a result of an old worn boot. The solution if your coil resistance is good... is to run down to NAPA and buy yourself a set of new boots. They come with new springs. They just need to fully-sleeve the spark plug's ceramic insulator, and make good electrical contact internally. If air can get in and out, so can spark.

FYI: When inspecting older worn-out boots, wherever spark leaks through leaves a white spot.

Category:

Autos & Vehicles

Tags:

• 4g63
• coil
• on
• plug
• eclipse
• talon
• laser
• awd
• turbo
• eagle
• plymouth
• mitsubishi
• intrepid
• ignition

[MrBskills]

Thanks a lot. I am in the process of moving to a COP and I bought the same boots, but now have to make the necessary adjustments for the plugs to fit. Do you know the coarseness of the one you used?

[Jafromobile]

@MrBskills Not sure how anyone gauges their coarseness. Some are designed for Aluminum, some for steel. Check out item # 1Z408 at Grainger. That's the exact tool I used.

[MrBskills]

I was checking your vid and I wanted to know, what is the name of the tool you use to open on the boot so that the plugs could fit properly

[Jafromobile]

@MrBskills That would be a 1/4" shaft carbide burr. They're available in tons of different shapes, sizes and degrees of coarseness.

I just used this one because its burr diameter was close-enough to the ceramic insulators diameter, and the ball-shape is easier to control when cutting rubber than a larger cylindrical burr would be.

[martingouda]

just wanted to say thanks for a GREAT how to video... i'll be doing cop to my eagle tsi awd and i will be following everything you did here

[Jafromobile]

If you don't have to win show trophies, and if you still have a factory intake manifold and don't HAVE to remove the factory coils... don't. 

The factory coils have about the shortest dwell time you'll find on any coils anywhere ('cept for a few bikes like the GSX-R, google 'em). The wiring would be the same for those, but the factory coils have held strong at around 40 PSI without a CDI box on some very fast and famous cars.

I do like how tidy it makes everything, though... yes indeed. ;)

[kalima275]

Great video...thanks a ton for putting the time and effort in to making it. I ripped a boot from an AMS COP system I had on my 9 and called AMS to get a replacement boot. They had no clue how much a boot would be and told me they'd call me in 24 hours. Screw that...I'm heading to NAPA tomorrow.

[TheShawn006]

Hey Jafromobbile, came across your vid while researching something else... don't even have a DOHC LOL... but loved the info, music, and cinematics. GREAT VID!!!!

[Jafromobile]

I'm trying to understand this... ordered what from Mitsubishi? I'm confused. None of these parts except the coil that I cut the plug off of came from any cars that Mitsubishi uses parts from. This isn't a chrysler engine.

& yeah, I know about the Chrysler thing. It's a shame that short of a Viper, they haven't built anything else with this kind of potential since '89. I'm very grateful for their participation with Mitsubishi and promoting the 4g63T here in the US.

[jayguy173]

could have orderd from mitsubishi instead since chrysler had no say in this car really but reselling it to americans and building it in america