Autolite Spark Plugs

volmvolvo850 · Post by **volmvolvo850** » 26 Jun 2010, 13:23

I just bought a set of Autolite plugs pn# 3923 from Autozone. After reading various threads im concerned i didnt get the right plugs, any suggestions on what plugs to get?? I'm limited to Autozone and Advance auto parts in my location. 1996 850 Turbo wagon...thanks ahead...............d

Post by **JDS60R** » 26 Jun 2010, 13:37

It is correct per the autolite site. I would pull a plug from the motor when its cold and compare them.

If you know the factory plugs number you can cross reference it as well. make sure to do this as Autolite has had the wrong plug number for the "R" cars for years now. I write and call them periodically but they obviously don't care.

That being said they do make a great spark plug. I have had issues witht he double platinum plugs losing the platinum piece on the ground electrode.

volmvolvo850 · Post by **volmvolvo850** » 26 Jun 2010, 14:53

thank you

Post by **jblackburn** » 26 Jun 2010, 19:36

I ran a set of them before, the Platinum ones. I bought the Double Platinum (single-prong) to replace my Bosch Coppers today. They're going in next week, but in the meantime let us know how they work for you.

The important thing is the gap - you'll want to gap them to .028" (mine came gapped a .030" according to their computer).

FCPEURO · Post by **FCPEURO** » 27 Jun 2010, 08:01

It really depends on your car weather or not it will like them. My 850 would only run well on the OEM Volvo spark plugs. Other wise, the car would misfire after a week or so of driving.

Try them out and see how she likes them.

Post by **Ozark Lee** » 27 Jun 2010, 08:28

You can get Bosch Coppers at NAPA and they will always work if they are gapped correctly. They used to be part number FR7DC but they got renamed to part number 7955. I had to go to three NAPA stores yesterday to score 15 of them.

The good news is that they are cheap - under $2.00 per plug.

...Lee

volmvolvo850 · Post by **volmvolvo850** » 27 Jun 2010, 10:33

thanks for the tip

patredbruin · Post by **patredbruin** » 27 Jun 2010, 11:24

according to the volvo doctor here in RI bosch coppers pn 7955 also said they do not run well on platinums

Post by **jblackburn** » 27 Jun 2010, 16:37

The Bosch Coppers work well, but they don't last very long. Not much of a problem as cheap as they are, but I decided to go for something a little better but refused to spend the $50 on the Volvo plugs. I do a LOT of driving, and had the coppers in mine for ~ 1 year 6 months. In the past couple weeks, I kept feeling a hiccup getting out on the highway under heavy throttle ~ 5000 RPM.

I changed my plugs to the Autolite Double Platinums today, and it runs great (I previously had a set that worked very well too).