2003 Corolla spark plugs at 92500 - Toyota Nation Forum : Toyota Car and Truck Forums

holler1 · 12-27-2008, 09:50 AM

I replaced plugs in my daughter's Corolla. The originals were NGK and I put in Denso iridiums. The old ones look pretty good and the gaps are right on the mark. Here is a photo. #1 cylinder on the left. I was wondering if #1 is running a little hot. Any thoughts?

***new echo owner*** · 12-27-2008, 09:58 AM

This may help you: http://www.ngksparkplugs.com/techinf...200&country=US

N.E.O.

holler1 · 12-27-2008, 10:06 AM

Image didn't load. Trying a link.
http://picasaweb.google.com/wvholler...98046730327618

mikered30 · 12-27-2008, 10:15 AM

They look great.

***new echo owner*** · 12-27-2008, 10:24 AM

#1 actually looks pretty normal from your picture, #4 looks like there is some deposit on it though. The lighting of the picture makes it a little difficult to tell if it is deposit on the insulator or just shadow of the light.

However, I have to admit that I am not very good at reading plugs though.

N.E.O.

holler1 · 12-27-2008, 12:39 PM

Thanks. I added a couple more pictures. All of them have a slight deposit on the ceramic.
http://picasaweb.google.com/wvholler...39749424713442
http://picasaweb.google.com/wvholler...40062440032882

***new echo owner*** · 12-27-2008, 01:42 PM

Was the car being driven on the highway mostly?

N.E.O.

***new echo owner*** · 12-27-2008, 03:50 PM

Those plug looks like they are glazed from highway driving.

N.E.O.

holler1 · 12-27-2008, 04:21 PM

I don't know the full history. My daughter bought it in 2007 with 75000 miles. She has driven to and from Chicago a few times and around Chicago in city driving. The previous owners lived in Pittsburgh so it was probably a mix of city and highway. Thanks for the inputs. Currently I am trying to "cure" a P0420 code, hopefully w/o buying a cat converter.

JasonA · 12-28-2008, 08:43 PM

I don't know; they look awfully good to me. Good on you for replacing with the OE spec (iridium) instead of throwing in some copper Autolites!

I can't see a thing wrong with those plugs, other than some slight gap opening.

holler1 · 12-29-2008, 08:18 PM

Thanks again. The gaps looked wide to me too but they are all between 0.040 and .045, closer to .045.

JasonA · 12-30-2008, 07:09 AM

Quote:

Originally Posted by holler1

Thanks again. The gaps looked wide to me too but they are all between 0.040 and .045, closer to .045.

I re-read your first post, where you indicated the gaps were correct. They DO look wide. Feeler gauges don't lie, though.