M275 Coil Pack Conversion - Page 5

Apr 13, 2025 | 09:33 PM

#101

Hank Houston

Member

Joined: Dec 2021

Posts: 179

Likes: 30

From: Nyc

S-600 w220, Nissan s13 coupe, and Nissan s13 convertible

Quote:

Originally Posted by vettebk

Great news on the repair. I have to confess my suspicion on the Chinese parts but success is good! I routinely replace the coil packs every 40K miles but I purchased an upgraded Voltage Transformer from V12icPack.com to replace my OEM VT at 45K miles and now have 102K miles. Suggest you consider ABC filter and fluid change and auto trans oil and filter change especially if you do not know the history of the car. Good luck and keep us posted.

Lucky you! I have bought 3 voltage transformers and all three were bad. I bought Clark's boost box and had him repair both my coilpacks. Passenger side coilpack and boost box failed upon arrival. Sent them back, Clark sent me a used boost box and claims to have re-repaired the coilpack. I put them in and passenger side still misfiring. Bought a coilpack from aliexpress, this one work most of the time. Driverside coilpack is failing now. The entire bank misfires about 20min after i clear the codes. When it misfires it's all of the driverside and maybe 3 passenger side. Bought another driverside from aliexpress. Installed it and check engine light came back on. I hate the ignition system on the m275. I've owned, modified, and driven a lot of cars. I've never had to deal with ignition system problems until I got my s600. Maybe I just have bad luck and keep getting broken parts

Apr 13, 2025 | 09:51 PM

#102

vettebk

Super Member

Joined: Dec 2018

Posts: 857

Likes: 501

From: Washington, DC

2007 S600, 2007 Chrysler 300 SRT8, 2000 C5 Corvette, 2017 Mustang GT, 2023 300C, and a 2019 Lincoln

I have supported Clark's products since 2019, I bought every product he sells. Periodically on coil packs, I have heard of problems, but he always stands behind every product and will repair it. He has a consuming obsession with quality and you just need to communicate with him. I bought one of the first early boost boxes and it had a small resister scrap wire that fell into the box. Shorted out everything. He sent me a new one. It also failed. Third time was the charm. I do like his coil packs and boost box and his version 2 Voltage Transformer.

I have also used FCP Euro for coil packs and these have a lifetime warranty. So since the coil packs are a known weak spot, you might go the FCP route if you plan on keeping the car for another 50K miles. You simply return the bad pack. Save your invoices.

In my opinion, a properly maintained S600 is the finest motorcar in the World.

Apr 14, 2025 | 04:48 AM

#103

Hank Houston

Member

Joined: Dec 2021

Posts: 179

Likes: 30

From: Nyc

S-600 w220, Nissan s13 coupe, and Nissan s13 convertible

I been dealing with Clark for over a year now. I opted to buy from aliexpress because shipping the coilpack to him cost me like $150 and he can get it shipped back to me for cheaper at around $100. Even if Clark isn't charging me, shipping costs me $250. Considering the last time I sent back the passenger side coilpack and he sent it back still broken doesn't give me confidence with him. He's claiming that maybe something got knocked loose during shipping. If something can get knocked loose during shipping then I gotta question the quality of his repairs. Plus the driverside is messing up in less than 500 miles. So I need to send both sides back to Clark. Shipping is discouraging and Clark honestly doesn't seem too enthusiastic about repairing these things. The car drives like a dream for like 10min before I have to pull over and clear the codes.

Apr 14, 2025 | 11:15 AM

#104

vettebk

Super Member

Joined: Dec 2018

Posts: 857

Likes: 501

From: Washington, DC

2007 S600, 2007 Chrysler 300 SRT8, 2000 C5 Corvette, 2017 Mustang GT, 2023 300C, and a 2019 Lincoln

Very surprised to hear this. Where are you located? What scanner are you using?

After the ten minutes of clean running, before you clear the codes, could you share the codes set with us? I'd like to help.

Apr 14, 2025 | 12:15 PM

#105

Hank Houston

Member

Joined: Dec 2021

Posts: 179

Likes: 30

From: Nyc

S-600 w220, Nissan s13 coupe, and Nissan s13 convertible

I'm located in nyc and the scanner I use is an autel ms906ts. I haven't checked it with the coilpack I just got in from aliexpress. With Clark's coilpack after about 10-20min the entire bank misfires (7-12) and passenger side will have misfired in 2-3 cylinders. So it will misfire in 9 cylinders after about 10-20min of driving. I'll take it for a spin later and see what codes I get. The issue for me right now is my inspection is expired and I can't drive the car for 80 miles without the check engine light coming back on

Apr 14, 2025 | 12:44 PM

#106

vettebk

Super Member

Joined: Dec 2018

Posts: 857

Likes: 501

From: Washington, DC

2007 S600, 2007 Chrysler 300 SRT8, 2000 C5 Corvette, 2017 Mustang GT, 2023 300C, and a 2019 Lincoln

Usually when all of the cylinders are mis-firing on one side, that is a Voltage Transformer problem. A coil pack with one or two or even three mis-fires is usually just the coil pack. Could you have a bad VT?

Apr 14, 2025 | 05:45 PM

#107

Hank Houston

Member

Joined: Dec 2021

Posts: 179

Likes: 30

From: Nyc

S-600 w220, Nissan s13 coupe, and Nissan s13 convertible

I bought the boost box from Clark. He claims there's nothing wrong with it but I have my suspicions about it. If this one is busted then that would make it the 5th one. I bought 2 from Amazon and one from fcpeuro.com, all three were bad. This is my second boost box. I'm getting ready to go to the car. I'll post the codes in a little bit