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Misfiring under boost

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Misfiring under boost

Postby emarkey » Thu, 17 Sep 2015 4:04 +0000

The car is misfiring when I get to about 0.5 bar. A bad misfire, much like hitting a spark cut limiter. This happened after sitting for a week or 2, changed the leads. Drives fine off boost e.g. cruising. The plugs were the recommended ngk r copper plugs, only 1 or 2K km on them, if even that.

I put new plugs in (standard, not the recommended ngk r ones) and I THINK it improved ever so slightly. Think they need gaping, or just new ngk r copper plugs?

Before this, it was running great (bar a vacuum leak which is now fixed). I think, that the vacuum leak which cause the car to run crap and rich, may have wrecked the plugs.
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Re: Misfiring under boost

Postby sidewaysreilly » Fri, 18 Sep 2015 12:11 +0000

what plug gap are you using? You also need a colder grade than standard.
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Re: Misfiring under boost

Postby Steve » Fri, 18 Sep 2015 3:01 +0000

yep, regap them down, sounds like the boost is blowing out the spark.
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Re: Misfiring under boost

Postby emarkey » Tue, 22 Sep 2015 10:17 +0000

Got it, lads. It was the map, over fuelling.
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