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NGK plugs problems?

eddieedmo

eddieedmo

New member
I put new NGK plugs in about 2000mls ago in July and have had to replace because of poor running,lumpy , hesitant acceleration etc.Anyone else had problems with NGK plugs.New set are NGK and all well at the moment.I did notice that the sealing ring on the ones I took out were flattened and the new plugs when tightened felt quite 'soft' when torquing up.Only way I can descibe it.So maybe the sealing washers where shot.?

Nick [:D]
 
Only engine I have ever run NGK plugs in was my 400 Honda, - sold 25 years ago.
Cant remember why I dont like them!
 
I've got recent NGK plugs in my turbo and have noticed a very slight hesitancy in 2nd coming on boost sometimes. A good blat tends to clear it.

Incidentally I replaced my last NGK plugs because of this same issue (much worse though) but just thought the old ones were worn as the problem immediately went away with the new plugs only for it to ever so slightly re-appear about 1000 miles or so later?

What other plugs are you people using? Particularly interested in mildly modded turbo people!

Edit to say it was Bosch WR 7DC+ plugs that came out which were causing the hesitancy. They were a bit worn though.

Cheers

Stuart
 
Although I don't have the same engine,i had a similar problem when I first got my lux. It was so bad that the car would 'shunt' in 4th at 30mph. It had some strange 4-pronged bosch wr7-8 plugs (or something like that) fitted which I replaced with standard bosch wr7-dc plugs. The shunting and hesitancy has petty much gone.

The washer getting flattened is quite normal.
 
Which NGK do you use?
Do you at least check the gap (should be 0.7mm) before installing them?
I would think a faulty/tired distributor and/or HT leads could also cause some misfire.

If I remember correctly :
NGK BPR7ES for standard S2/968 engines.
NGK BPR5ES for standard turbos and all other standard 944 engines, S included.

I use BPR7ES ones in my modified turbo, but run an aftermarket ignition system that certainly has more ignition power than the standard system, and have never had a problem with the NGK.
I also didn't have any problem with these same plugs when I was running the standard ignition.
 
With various cars in the last forty years, I have tried Bosch plugs. So often was one of four or six faulty that I changed to NGK. Never had a problem with them. Have you got carbon core leads? They crack and even if looking lovely and clean, can give you all the faults you are talking about.

 
Just fitted Bosch WR 7DC+ with Ytrium tips okay ! declined the NGK jobbies offered.

Edited to say you can get them on e bay for about £9 delivered.
 
I whipped mine out today to find them all slightly wider then 0.8mm.I have set them to 0.7mm and all seems fine. Should really have checked them before I put them in!

Stuart
 
I've just changed to Denso Iridiums and although more expensive than standard plugs they def seem to perform better IMO, MPG has risen too.

Edd
 
I agree, the Denso Iridium plugs perform far better than all the rest, but they cost an awful lot more.

I used exclusively the Denso with the standard ignition system but have moved back to the NGK when I installed the aftermarket ignition system as this is the plugs the seller recommended as his settings of the ignition system were based on these plugs.

I may try the Denso again in the future.
 
I have always sworm by bosch. I did use ngk a few years ago but found that they woud break down prematurely compaired to bosch.The car would develop a horrible miss fire when the plugs were not that old so I switdhed to bosch and never had the problem again.
 
NGK are meant to be very reliable; when I was dabbling in the field of automotive diagnostics then NGK's were the ones to have as they were so reliable. Cheap (or old, or worn, or damaged) plugs are the cause of many an bad running problem ...

I use Bosch (WR5DC+) in my S2 as they are available very cheaply and are the recommended plug. I've never had a problem with them, and at around £1 each I can afford to change them every service.


Oli.


 
used ngk plugs in my motorcross bikes(two strokes )for about 20 years. and my road bikes (four stroke)with no problems they seem to be a good sparkplug
 
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