Boost cutting/jerking under boost - coilpacks?

[lowandy]

Got a forester with a V4 sti motor and when giving it the jandal it seems to jerk like the boost is cutting then coming back on quickly. Basically only does it under load e.g boosting it, planting it in 3rd gear when cars going 20kmh.

From what i know about nissans is that its mostly due to the old coilpacks. Just thought id double check that thats what is could be and also any place inparticular i can get some new ones?

Would you guys recommend new or secondhand?

Cheers

[nztintin]

I had the same issue, was just a dodgy ht lead.

and i always recommend new.

[lowandy]

 nztintin said:

I had the same issue, was just a dodgy ht lead.

and i always recommend new.

Would it be best to test the HT Leads for resistance or is it only when its under load that the leads become faulty?

Where would you recommend getting new parts from? Not much on trademe in the ways of coilpacks or ht leads so was thinking Supercheap auto for Boch leads

[nztintin]

no way to test them AFAIK

I got eagle oversize leads from repco.

[lowandy]

Well on closer inspection i dont have coilpacks! Haha so just gonna replace the HT leads, anyone recommend a place that sells 8.0mm leads?

[Timmah]

 lowandy said:

Well on closer inspection i dont have coilpacks! Haha so just gonna replace the HT leads, anyone recommend a place that sells 8.0mm leads?

Supercheap sell Bosch replacements which Thorpy on here used on his V4 STi Coup which got around 210kw on a dyno.

[lowandy]

 Timmah said:

Supercheap sell Bosch replacements which Thorpy on here used on his V4 STi Coup which got around 210kw on a dyno.

Awesome will replace mine after i replace my buggered clutch

[Nat0rious]

Would the same leads from supercheap fit v3?? and would subaru sell them etc?

 Timmah said:

Supercheap sell Bosch replacements which Thorpy on here used on his V4 STi Coup which got around 210kw on a dyno.

[calebwrx]

I would replace spark plugs before going straight for leads.

For my V7 WRX I use BKR6E plugs (some people won't like this/say they're the wrong ones) but they work for me. Do some research and make your own decision on which ones you want to get, just make sure they're gapped to around 0.8mm.

If you go for copper plugs like me, you could fix the issue for $24 vs the price of new leads.

[Timmah]

 calebwrx said:

I would replace spark plugs before going straight for leads.

For my V7 WRX I use BKR6E plugs (some people won't like this/say they're the wrong ones) but they work for me. Do some research and make your own decision on which ones you want to get, just make sure they're gapped to around 0.8mm.

If you go for copper plugs like me, you could fix the issue for $24 vs the price of new leads.

I recently bought some NGK BKR6EIX from Ebay for under $70 landed. Took about a week tops.

http://www.ebay.com/itm/4-PCS-NGK-Iridium-IX-Spark-Plugs-BKR6EIX-6418-Made-in-JAPAN-/221707695261?hash=item339ecef49d&vxp=mtr

Only downside for coppers is that you have to change them more regularly compared to Iridium/Platinum/Laser Platinum