sometimes jerky on full throttle

**Ade** · Tuesday 25th January 2011, 19:52

Got my t5 back today, first Rica mapped run with all boost pipes intact!

Thing is it tends to shudder/jerk/hold back slightly when on full throttle sometimes.... Any idea what this may be?

**T5frankie** · Tuesday 25th January 2011, 19:59

spark plugs

**t5 pete** · Tuesday 25th January 2011, 20:00

put new spark plugs in alot of people have this ones having a remap

**Ade** · Tuesday 25th January 2011, 20:01

Cool, a quick check of one looked ok, but prob worth doing them if that's common.

**t5 pete** · Tuesday 25th January 2011, 20:47

They always do look ok but for some reason the remap deffinatly picks out the weak plugs

**Volvostorm** · Tuesday 25th January 2011, 21:00

These are cheap:

http://cgi.ebay.co.uk/GENUINE-Volvo-...item43a327cbbb

**thunderace** · Tuesday 25th January 2011, 21:02

Originally Posted by Ade

Got my t5 back today, first Rica mapped run with all boost pipes intact!

Thing is it tends to shudder/jerk/hold back slightly when on full throttle sometimes.... Any idea what this may be?

Mine did the same at about 3500rpm, changed leads and plugs and problem fixed.

**96T5Andy** · Tuesday 25th January 2011, 21:43

Originally Posted by Pault5estate

These are cheap:

http://cgi.ebay.co.uk/GENUINE-Volvo-...item43a327cbbb

I also bought some sparkplugs from that same seller. very happy with the item.

**woz** · Tuesday 25th January 2011, 21:53

same thing with mine, - try different petrol - TEsco 99 throbonator seems better in my car than Shell Veep.
Yet Shell Foolsave is better than any other vomit fuel when needs must.

Even with the best option I still get occasional shudder under full boost like a sort of cough or hiccup.

Had similar troubles to yours which bacame almost chronic - had two garages look at it - in the end someone on here suggested plug leads so i replaced those and "poof" problem solved - back to the normal mild hiccups anyway.

So - if you have changed the plugs and tested different petrols, try the leads and dizzy cap then get your injectors cleaned by Jimathon, you should notice a good improvement at least.

Cheers

Woz
Oh and let us all know what the solution is;>)

**Ade** · Wednesday 26th January 2011, 00:17

Plugs ordered.... fingers crossed!

**merc85** · Wednesday 26th January 2011, 17:05

I'd try some new leads as mine was suffering the same symptoms, new leads cured this although mine is not remaped.

**chunky** · Friday 29th July 2011, 23:42

im having same problem,does anyone use ngk iridium plugs? if not what do you reccomend? cheers

**p fandango** · Friday 29th July 2011, 23:46

Originally Posted by chunky

im having same problem,does anyone use ngk iridium plugs? if not what do you reccomend? cheers

most just stick with genuine Volvo ones

**The Flying Moose** · Friday 29th July 2011, 23:50

I use NGK Platinums, I have found they last the longest and I have never had any issues. The bosch super plus plugs seem good too.

As pedro says however you can pick up a set of genuine for £25.