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Author Subject: Diagnostic help - HGF?
danposs86

Regular

Location: Sedbergh

Registered: 18 Jun 2011

Posts: 287

Status: Offline
Post #1
Car had an overheating moment, a couple of days later when I started the engine it sounded/was running on 3 cylinders. It went after a min or so.

We checked the coil packs and plugs, seemed fine.

Started throwing smoke out of the exhaust from cold.

No sign of oil in the coolant, no mayo under oil cap.

Did a Compression test.
Pistons 1,2 and 3 at 15 bar
Piston 4 16bar.
All pistons dry after taking plugs out. Number 4 damp with either oil, water or fuel (unlikely fuel) after compression test.

Doesn't seem to be a loss in power. Have had a slight water temp problem tonight on the drive home, it went back to normal temp when I got on an open flowing road.

Does this sound like a buggered head gasket?

Any ideas for further testing?

Thanks.

________________________________________

danposs86's GTi-6
Posted 1st Jun 2012 at 21:31
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yippeekayay

Seasoned Pro

Location: wilts

Registered: 27 Oct 2008

Posts: 4,144

Status: Offline
Post #2
airlock??? changed the rad or anything else recently?? get a carbon monoxide test on it...

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Posted 1st Jun 2012 at 21:44
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welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,817

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Post #3
sounds possible, its number 4 that usually goes (timing belt end),

The higher reading is likely to have been from some water in the cylinder, though I've never done a compression test as the clearing misfire from cold start is a sure sign that its on its way.

only one of the three I've done this year has ever so slight signs of oil mixing, that one still had pressure in the cooling system 2 days after driving it a few hundred yards!

heater matrix was leaking on two of the three btw...

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Posted 1st Jun 2012 at 21:48
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scotzman

Seasoned Pro

Location: Dundee

Registered: 24 Jun 2011

Posts: 1,408

Status: Offline
Post #4
out of curiosity, why does the heater matrix go with a HG? Increased coolant preasure and an already weakened old heater matrix?

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'90 1.6 205 GTi, '98 306 GTi-6
Posted 1st Jun 2012 at 21:54
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danposs86

Regular

Location: Sedbergh

Registered: 18 Jun 2011

Posts: 287

Status: Offline
Post #5
welshpug! wrote:
sounds possible, its number 4 that usually goes (timing belt end),


Ahh, cylinder 1 then (gearbox end) is at 16bar

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danposs86's GTi-6
Posted 1st Jun 2012 at 21:55
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bigbadbowen

Seasoned Pro

Location: Winchester

Registered: 21 Nov 2003

Posts: 13,752

Status: Offline
Post #6
If its miss firing on start up its defo on its way out they go at. Number of places so a comp test may not work best get the head off and check Yes
Posted 1st Jun 2012 at 22:02
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stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

Posts: 21,768

Status: Offline
Post #7
Another vote for the HG with those symptoms. Yes

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"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 2nd Jun 2012 at 00:22
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Rich E Forum Admin

Location: Hertfordshire

Registered: 27 Apr 2005

Posts: 7,757

Status: Offline
Post #8
Yeah, I'd say HG too with those symptoms. Check the coolant for pressurisation when it's cold. That's a good confirmation indicator.

scotzman wrote:
out of curiosity, why does the heater matrix go with a HG? Increased coolant preasure and an already weakened old heater matrix?


Basically yes, although the matrix doesn't always pop.

________________________________________

Rich
Posted 2nd Jun 2012 at 09:29
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danposs86

Regular

Location: Sedbergh

Registered: 18 Jun 2011

Posts: 287

Status: Offline
Post #9
Its a head gasket.

No mayo under the cap, but we found mayo and water in the oil catch tank Sad

Ordered the kits needed to sort it.

________________________________________

danposs86's GTi-6
Posted 3rd Jun 2012 at 14:47
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stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

Posts: 21,768

Status: Offline
Post #10
Sad

At least you can get it fixed up. Smile

________________________________________

"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 3rd Jun 2012 at 15:35
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danposs86

Regular

Location: Sedbergh

Registered: 18 Jun 2011

Posts: 287

Status: Offline
Post #11
Yep. Might use the old head of the engine that got flooded. Seemed to all be in good shape. Will check the valves, might look into getting it skimmed incase it warped when taking it off the old block.

On the bright side, I have been painting up engine parts to clean up the bay, just means I now have to finish them quicker than planned.

________________________________________

danposs86's GTi-6
Posted 3rd Jun 2012 at 15:38
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