Just bought another Cossie & removed the plugs to check & found its fitted with Motorcraft Platinum AGPS092P spark plugs, iv'e only really used Champion C59C's in my other Cossie's with no problems so never heard of these plugs. Will they suit my car, its running RS500 8 inj & about 400bhp, has run fine except under full load in 5th on acceleration it dropped onto 3 cylinder at 130mph (private test track) backed off & has'nt been a problem since but not been upto that speed since. They are gapped at 0.75mm,last owner had them fitted 1 month ago whilst car was being serviced at GGR.

Cheers Simon.

 

I tried these but car felt flat as hell, replaced with another set of AGPR12PP8, well the DENSO equivalent as these are usually what is in the box, even from ford, but ace plugs, much crisper response, especially with group a coil.
tabetha

 

OK thanks , just noticed that the plugs iv'e got fitted must be standard ones as the sticker on the i/cooler has the spark plug number on there which is the original sticker from factory. Its still running the original coil so may change that as i found it helped things on my last Cossie.

Cheers Si

 

How is the car going Simon ?

You fitted the springs yet ?

Steve.

 

Beware of the pp8's...thats all im saying

 

I have used these in mine for about 4 years and never had a problem.

Steve.

 

i used them for a week, and at 32 psi they melted my engine

as stu then told me, they are waaaaaay to hot for that use

 

I don't run that much boost

Steve.

 

thats ok then! other than melting my engine they were ok

 

use the ford 071c