Put some in when I had the service done but didn't check the gap. In the last two days when it has been freezing in the mornings the car is VERY jerky at intermittent periods, as though it is misfiring or someone is stamping on and off the brakes. Due to them being colder runing plugs I didn't know if these could be the source of the problem. Does it a little bit when warmer in the day but couldn't even drive to work the other day cause it was so jerky and didn't want to chance it.

Fueling is fine, does it at low and high revs, when warm and cold, when applying the throttle slowly and quickly.

What else could it be? Coils?

 

My new PFR7Bs were at 0.85 which is a bit wide.

 

Shall have to take them out and re-gap them.

Looks quite trick to get em out though, any helpful ideas?

 

Hmm, mine were gapped at 0.7mm I haven't fitted them, so I just double-checked.

Only way to know for sure is to take them out and check.

Stefan

 

I think they are supposed to be gapped at 0.8mm out of the box.

However, it's worth checking them first, and re-gapping as required.

0.7mm seems to be the commonly used setting, from the various posts I've read on here in the last year or two...

 

Yep 0.7mm should be the right gap

MAFFA

 

Would PFR7B's with standard gap cause the problems in my top post when it is very cold outside (-2/3 celcius)?

would it be worth changing to the 6B's??

 

I just recently put on a set of the hks s40i and gave them to my dealer to fit while they were servicing the car.

Question is firstly are the y to cold for my STI5 Type R and secondly would the dealer have checked and regapped them.


Mel.

 

S40's are too cold, you should fit S35i's instead, they come gapped at 0.7mm and are iridium "needle" plugs in the the electrode is only 0.4mm dia.

bob

 

Will it cause damage to my car running these bob?


Mel.

 

It will cause unburnt fuel to be left in the cylinders on cruise as the plugs will not get hot enough to fire properly, despite the expense I would suggest taking them out, sooner or later they will foul and then the car will run rougher and not pull as well.

Bob

 

I think it is doing a bit now as it doesn't feel as if it pulls as well as it did before.


Mel.