longman

Hi Lads,

Can anyone help point me in the right direction.

Just taken the Saph on a 100mile round trip to Stratford. All went beautifully until ten miles before home when it started juddering (not a suspension or transmission balance juddering, more like a boost/fuel feel to it).

Symptoms are;

- Can be left for a few days and then be right as rain for weeks but will start again with no warning
- Does it at all revs
- Still makes boost
- Still Idles but lumpy
- Spark at all 4 plugs
- Pops and bangs when overrunning/slowing down through gears
- No smoke or anything untowards out the back
- The best way I can describe the sound is like an Impreza with a big exhaust.

Cheers in advance,
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martysmartie

iTrader: (1)

Have you done a compression check, is it loosing coolant?

Martin

longman

No I havn't.

Tell me you're not thinking it sounds like the dreaded HG failure??

martysmartie

iTrader: (1)

If it is, then yes or worse a cracked head.

Martin

Cossiemainful

iTrader: (1)

If it's not the HG I would change all sensors.

Bez789

If you leave it for a few days and its fine for a week it's not a cracked head.

Toe Knee

iTrader: (2)

Worth checking the plenum gasket on my last one it had an air leak, would drive fine then all of a sudden would be like hitting a brick wall and shit to drive then be fine again!!

opposite lock

iTrader: (3)

Maybe its dirty fuel or filter/pump .

Danny555

Map sensor or Ignition amplifier?