Spark plugs?

[Reecemac16]

Hi all

Looking for some advice from someone smarter than myself on what spark plug I should choose.

Had my Tiv coming up to a year and being struggling with fouling plugs. When I picked it up it was running rough on idle, cold and hot, had the spark plugs out and gave them a good clean and all was working well until I got it back out the garage after Christmas where I’m back at the same issue.

The current plugs I have are B7ECS and I’ve been looking through the threads on here a few people tend to opt for the 6’s as it leads to less fouling however I’m not sure which ones I need. Resistive/non resistive if they make any difference? Or just order a new set of what’s in there and carry on as is.

It’s a 96’ 400 with the Emerald ECU upgrade if it makes any difference?

Thank you!

[Belle427]

I would stick to BPR6ES with an aftermarket management system.

[Reecemac16]

Thanks for the reply, Does the fact it’s resistive make any difference do you know?

[Belle427]

Some resistance is required in the circuit to stop interference etc but how much is another question I cant answer really.
I was advised to stick to BPR6ES on an aftermarket system.

[Reecemac16]

Perfect I’ll go with them and see how it gets on😁 many thanks

[fieryfred]

The only differencer between BPR6ES & BPR6E is the end connector is screwed on the S. I use the 6E which is fixed, that way i never have a loose end.
The V groove improves performance. Apparently.
Useless bit of information.

[sixor8]

Eh? The NGK chart suggests S is just the standard copper core. No symbol at all IS the V groove.

https://www.ngk.com/ngk-spark-plug-numbering-syste...

[sixor8]

In addition, my Griff has BP6ES, the HT leads are resistive anyway.

[Sardonicus]

fieryfred said:

The only differencer between BPR6ES & BPR6E is the end connector is screwed on the S. I use the 6E which is fixed, that way i never have a loose end.
The V groove improves performance. Apparently.
Useless bit of information.

The other difference is the E has a V grooved ground electrode the S is standard non V groove , Reecemac if you have suppressed leads omit the R in the plug number however if in doubt stick to NGK BPR6ES like mentioned above