camaro81

I changed to NGK TR6 plugs a few weeks ago and my car started running like crap. I swaped my stock AC Delco platinums w/ 50k miles on them back in and the car idled normal again.....

A week ago I put in a set of Autolite 106's and the car started surging again, just like it did with the TR6's

Last night I put my AC Delco plugs back in and it idles normal.

The NGK plugs looked white when I took'em out, but the Autolites looked perfect.

Why in the world would my car not run off brand new regular plugs, but run great with my wore out platinums???

BUBBA

Are you running juice or boost? Why are you going with a 6 rather than a 5?

buzz12586

Did u have them gapped properly??

camaro81

I recently installed nitrous on the car and decided to go with the TR6's. When they didnt work, I went with stock heat range regular plugs, autolite 106's.

The TR6's were gapped at .035 and the 106's were gapped at .050, the recomended gap for each plug.

valter

Probably one of the new plugs defective, cracked isolator/etc, can be invisible But, on other hand miss from it would lead to rich, not lean condition.

WS Sick

I thought the stock equivalent in the autolites was the 104s?

BUBBA

Don't know why the 6s don't work with the nitrous, but when you rarely use nitrous, then I would assume that you should be using the hotter plugs, e.g., NGK TR55, TR55GP (plats) PZTR5A-15 Laser Plats or the TR55IX, irradiums gapped at 0.50. Sounds like you are either using the wrong plugs or the wrong gaps or a combination thereof.

Suggest you go with the hotter TR55s , copper, or the TR55IXs gapped at 0.50. JMHO

BUBBA

Well, if you are using the Autolite 106s or APP106s (OEM) gapped at 0.50 you should be good to go, so it must be something else like broken plug, wire, etc.

Good luck.

camaro81

what got me is the fact that the TR6's looked like they were lean
http://www.geocities.com/mystic95z28/NGKplug.JPG

yet the autolites looked a tad bit rich, though I did find what looked like a small peice missing from one of the electrodes. It looked like this was a manufactoring flaw. Would this cause a missfire that would lead to an erratic surging condition?
http://www.geocities.com/mystic95z28/autolite.JPG

This crap seems weird as hell to me, I've been fiddling with it for a couple weeks because I don't know why my car only seems to run good on old *** platinum plugs. I know they're all gapped right and I didn't see any flaws with the plugs except for that one autolite that I just noticed.

The car does seem to have a very slight miss to it at idle, I can hear it in the exhaust, but it doesn't effect the idle speed.

Dansean1

I have run different sets of plugs on my 94, and the only plugs that woke the car and performed the best were AC Delcos or NGK TR55.

If you are going to run the TR6, a nitrous plug, gap them accordingly.

Another tip, when you run NGK TR55 for stock application (which you should when not running nitrous), gap them to about .040 - .042 to begin with. As they age the gap will begin to open to the factory called gap. This makes it much easier on the opti as well.

You should run stock plugs and only nitrous plugs when on the juice. The colder plug will cause it to run rich-perfect for nos, unless you have it tuned for different applications(example, LT1edit where you program tunes in at your discretion).