EQT Coil Grounding Kit (CGK) for EA888.3
Verify your coil pack connector part number for fitment prior to purchase - See the fitment tab below
The EQT Coil Grounding Kit (CGK) is designed and engineered to provide a simple solution for a common problem on the MQB EA888.3 Platform.
The factory cam cover is soft aluminum and is prone to stripping regardless of how careful you are when removing or installing the OE stud. Your ignition coil uses this stud to ground the coil circuit and any amount of damage can occur in a weak ground which may induce unnecessary knock retard or reduced spark energy, even if the threads are only mildly damaged.
The bolt is often removed and installed when servicing the ignition system or performing engine testing. Such as replacing spark plugs, ignition coils, performing compression, or a leak down test, etc.
VWAG in their infinite wisdom also uses oval bolts which exacerbates the problem the more times they're removed and installed.
By isolating the ignition coil ground to its own circuit and grounding it to the chassis, the need to remove the top nut is no longer necessary and the risk of having a weak, loose, or damaged ground is removed.
While you still need to remove the stud in order to remove the ignition coils, you don't need to "double nut" it anymore in order to ground the circuit -- preventing the chance of a weak circuit.
This Coil Grounding Kit (CGK) is constructed of only the highest quality proprietary components.
Each kit is assembled by hand in the USA to ensure the highest level of quality control.
- Installation Instructions with High-Resolution images and clear steps
- 1 x Precision Made Coil Grounding Harness with OEM Terminals for direct installation to your factory coil pack connector
- 4 new flanged Bolts to replace the factory ones, and reduce likelihood of stripping them with the removal process.
Damaged Connector? Our kit also allows you the option to replace any damaged OE coil pack connectors with new factory connectors (OEM PN: 4D0 971 994) which is also fairly common on this engine. Detailed instructions are provided with the pin assignment and wire colors to aid in this process.
Customers who fail to verify their coil pack connector and purchase the incorrect unit will not be eligible for refunds/returns.All MQB EA888.3/EA888.4 Powered vehicles with 4D0 971 994 coil pack connectors will require the CGK Pro 4D0. For all others see below for fitment.
- GTI/GTI & Golf R - Utilize the Grounding Lug behind the passenger Headlight
- A3/S3 - The grounding lug is located behind the passenger headlight on the frame, closest to the fender. You may also utilize the M6 threaded hole on the engine mount if the grounding lug is not easily accessible
- 8Y A3/S3 - You may want to route the grounding lug to the driver side and utilize the OE chassis grounding location near the rear of the battery.
- Mk8 - Fitment confirmed. Same as Mk7/Mk7.5
- Vehicles with With connector 8K0 971 994 you require the Pro 8K0 Kit and will not work with the 4D0 connector.
Customers who fail to verify their coil pack connector and purchase the incorrect unit will not be eligible for refunds/returns.
Installation Instructions (PDF)
Does this kit remedy the loose bolt problem?
The EQT Coil Grounding Kit removes the dependency on the factory coil securement hardware to ground the ignition circuit.
By no longer requiring the factory fastener it does allow you to utilize a true round m6x.10 metric fastener which has a much lower chance of causing damage to the threads.
It does not remedy any existing damage to the cam cover threads where the M6x1.0 metric fastener threads into, that is on the installer to resolve by means of a Helicoil or Timecert.
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Fixed a ghost misfire
I have a stage 2 e30 1.8t passat and had misfiring in cylinder 2, that I couldnt figure out, so I got the grounding kit and now engine doesnt misfire at all. I also have better power down low and uptop. Def worlth putting on your vw.
Works great, easy install and smoothed out my idle and no longer seeing any knock on wot pulls
Very well made product, just make sure you order the correct kit!
Good quality and so much more clean.
As usual another seamless transaction with a quality product. car idled smooth before, I’ll be it smoother now. The ease of changing plugs as well