The Top DSM Community on the Web

For 1990-1999 Mitsubishi Eclipse, Eagle Talon, Plymouth Laser, and Galant VR-4 Owners. Log in to remove most ads.

Please Support Rix Racing
Please Support Fuel Injector Clinic

How to gap your spark plugs

This site may earn a commission from merchant
affiliate links, including eBay, Amazon, and others.

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

This one is easy guys, but so often overlooked by newbies. Gapping your plugs is a no-brainer and essential to having your engine running properly.

You need two things:
1: Spark plugs
2: Gapper tool (I got mine at Auto Zone)

All you need to do is set the plug on the gapper and slide it to the desired gap. If the gap is too small, use the hole to pull up on the prong without pushing down on the electrode. It's that simple. Here are some pics. Note: As defiant points out, there is a chance that a ramp gapper will lead to crappy measurements. A wire gauge is better, but I didn't have one on hand. Happy gapping!

I was PMed about listing gaps so here you go:
4G63T: .7 - .8 mm
4G64: 1 - 1.1 mm
420A: 1.22 - 1.35

[Defiant: Throw that ramp-gapper away, and get a wire gauge:]

Defiant,
Thank you for the edit and the photo. I have also changed the original post to reflect another issue brought to my attention.
 

Attachments

  • DSC01167.jpg
    DSC01167.jpg
    62.2 KB · Views: 6,918
  • DSC01168.jpg
    DSC01168.jpg
    44.1 KB · Views: 6,876
  • pluggappers.jpg
    pluggappers.jpg
    31.5 KB · Views: 7,654
Support Vendors who Support the DSM Community
Boosted Fabrication ECM Tuning ExtremePSI Fuel Injector Clinic Innovation Products Jacks Transmissions JNZ Tuning Kiggly Racing Morrison Fabrications MyMitsubishiStore.com RixRacing RockAuto RTM Racing STM Tuned

Latest posts

Build Thread Updates

Vendor Updates

Latest Classifieds

Back
Top