Dudes...

Got a bit of a prob. Put in the bosch super 4 spark plugs yesterday and now i get a bit of a jerk where the acceleration just locks for a second only in 2nd and 3rd gear. Anyone got any ideas what it could be? My car's a '98 1.5 gxi.

Cheers

Ahhhh.... ...I just recently changed ny Bosche Super 4s for Denso Iridiums and the 'stuttering' has COMPLETELY disappeared!

The car now accelerates smoothly and a bit faster too.....


Mind you, my Super 4s HAD been in the car for about 18months to 2 years and looked a little messy too!

As you have new ones I wouldn't expect such a problem...


Anyone else running with Bosche Super 4s and any others with this problem?

have the same sort of problem my car fells like it hits a brick wall when i put my foot down but gets going after a few seconds, had the problem since a got the car but i also put the super 4s in on the same day. could be worth putting in some cheap ones to test.

i've got super4's running on magnecors on mine, didn't give me any jerking, just a bit pokier...

There's a website with 'buymotorspares' or words to that effect on it. I got 6 Iridium plugs for a shade over £10, that was including P&P. If you look at some tuner sites that are selling them for about £20 apiece!!

I can look up the exact address if anyone's interested. They also have the NGK Iridium plugs as well in case people prefer that brand.


Defeinitely worth it; especially seeing as the Super 4s cost me over £5 each anyway and from my experience the Densos are easily more than TWICE as good!! :P

Yeh I was thinking 20 quid is a bit expensive for one spark plug.. Is this the website by any chance where you can get em cheap? http://www.buypartsby.co.uk

Andy

Yeah! That's the one!

hey...

I changed the spark plugs back to old NGK ones but still getting the same problem. Like djcritter said, it feels like a birck wall. I've check for burn marks around the spark leads but nothing there either. So have no idea what it could be.

Any helps appreciated.

Does this happen when you run higher up into the rev or when you change up from lower revs?

What I'm trying to get to is: Are you expecting Impreza/Lancer slaying aceleration in low revs/high gear?


How about the leads? Have you checked that there are all fine (including at the ends) and haven't worn?

It is only in a couple of gears or all through the gears?

How many miles on your car?

its just when I change from first to second it happens and sometimes in third. Not expecting crazy revs or anything, i usually change gear at 2 and a half or 3000. Could be the leads like u said. Just don't want it to be anything serious.

I be tempted to put a set of good quality leads on it

can anyone recommend any good leads? and a good place to get them from...

Magnecor KV85 competition leads are good.

I tried that website, and the nippon Denso Iridium plugsa are like 8 quid each!

http://www.buypartsby.co.uk/nippon-dens ... make=MAZDA

Works out to about £10 each when you add the VAT and postage.

Worth every penny!!

(but may have led to more oil usage....(?) Jury's out on that one!)

I found this. very interesting stuff

http://www.magnecor.com/magnecor1/techb ... echmaz.htm

Thanks DJ - very educational !

Seems that we should be cleaning out the plug tunnels as part of the regular maintenance program ...

whats better platinum or iridium - and why?!

Yeh I was wondering this aswell, Iridium cost more... Does this mean they're better???

Iridium costs more because the material is rarer. The strength of the material means that the tip of the sparkplug electrode can be 0.4mm thick. The thinner the core the more the spark and the less power required to generate it.

...that's about it.


Platinum ones are a bit thicker at the electrode.

after changing the spark leads the jerking began happening again when i put the bosch super 4's in. Its been looked at properly and the distributors not creating a big enough spark, it's weak, so gna have to get that and the ignition coil replaced. thanks for all your help guys.

the theory of Iridium is correct as above, but to be honest, on a normal 4 stroke petrol engine you wont really notice the difference - its all in the mind and a great marketing trick.

I run a 2 Stroke Kart on Iridium plugs, it runs a HORRIFFIC amount of compression and the difference a bad plug compared to a good plug makes per lap is MAXIMUM 0.1 secs.....take away the compression levels and that effect is less still - so the MOST you are going to gain - even if the improvement is the same as on a kart is 0.1 per 45 secs or so. This equates to an over all improvement in the 0-60 time of around about 0.01 secs.....

If you can notice that, then you have better driving senses than some of the best drivers in the world, and really ought to start knocking on Jean Todt's door for a drive in Mr Schumachers car......

So why should i go out and buy a set of super 4s? whats the benefit from a set of normal plugs?

after my experience with them I'd say that you DON'T want to buy a set of Super 4s! :P:lol:


As fr the Iridiums; my car definitely likes them better and doesn't have the annoying 'power stutters' when accelerating in higher gears. The other thing about them is that they are supposed to reduce the amount of power drain from the battery..... ...er, great.

after my experience with them I'd say that you DON'T want to buy a set of Super 4s! :P:lol:


As fr the Iridiums; my car definitely likes them better and doesn't have the annoying 'power stutters' when accelerating in higher gears. The other thing about them is that they are supposed to reduce the amount of power drain from the battery..... ...er, great.

after my experience with them I'd say that you DON'T want to buy a set of Super 4s! :P:lol:


As fr the Iridiums; my car definitely likes them better and doesn't have the annoying 'power stutters' when accelerating in higher gears. The other thing about them is that they are supposed to reduce the amount of power drain from the battery..... ...er, great.

Are we in triplicate tonight Wai lol

so, Wai, Wai, Wai

[quote]after my experience with them I'd say that you DON'T want to buy a set of Super 4s! [/quote]

What happened dude?

woops.

Well i fitted them last weekend! so buggar! lol

Havnt had any probs with them yet - planning some KV85 leads to go with them!

He he; must have been a tecnical error! technical error! technical error!

Andy, I'm not sure if there is something wrong with Super4s per se, they were ok at the beginning but i have always had slight hesitancies with the engine under acceleration. With the new Densos ALL the flat spots have disappeared so I figure that these plugs must be much better than the Bosche ones......

The difference from one to the other was incredible and VERY noticable! They may cost twice the amount of Super4s but if we're only talking an extra fiver per cylinder (handicapped again! Damn! ) then it's money well spent.