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Guest Message by DevFuse

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Sparking plug heat range.

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2 replies to this topic

#1 darsdoug


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  • Seattle

Posted 31 March 2013 - 10:42 AM

Attached File  bosch.jpg   73.68K   13 downloadsYesterday I installed Bosch 4303 platinum spark plugs in my ea82 by mistake when they were supposed to go in my ej22. Can I leave it that way or will it foul things up?

Edited by darsdoug, 31 March 2013 - 10:53 AM.

#2 987687


    Rally Suby!

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Posted 31 March 2013 - 11:40 AM

I wouldn't install bosch platinum plugs in anything... I used them in an ej22 once, it ran crappy, and after a couple weeks ran horrible. This is how the plugs came out.



(I'm aware the screw thingy on the top is missing, but it was there when it was in the car, that's not why it ran bad)


After I changed to ngk coppers, it was fine.

Edited by 987687, 31 March 2013 - 11:41 AM.

#3 Tsuru


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Posted 01 April 2013 - 12:36 AM

+1 on the anti-Bosch Platinums.

I had  three fail in less than a month after installation on a 1991 Ranger V6, that's a 50% failure rate!

Immediately yanked them out and never used Bosch Plats on anything ever again.


For Japanese vehicles I use NGK,

For the Scout its AC/Delco

Ranger gets Autolite


Has anyone here have any experience with Pulstar Pulse Plugs?




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