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What causes a blown head gasket???

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Old 16-04-2008, 04:55 PM
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Mr Orange
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Default What causes a blown head gasket???

On monday driving home from work my car struggled to start then ran really bad with very irratic idle, loss of power compaired to normal and different tone from exhaust.
Struggled to start yesterday morning and when i reversed out my drive it cut out, started again but ran really badly with loss of power and lack of any urge below 3k revs, slightly cleared its throat above that but still ran poorly. Rac came out last night to have a look at the problem, started the car up then, took lead off cylinder 1 and the car cut out, restarted and did the same with cylinder 2, it ran on despite the lead being off. cylinder 3 did the exact same but cylinder 4 was the same as 1 ie cut out when lead removed.
Guy didnt have the proper tool for a compression test, but guess'ed that it is the head gasket.

car is now in a garage that will look at it tomorrow and report back.

but going by the above symptoms and running issues, would the gasket be blown and if so then how?
the cars regualarly serviced, was about to get the 60k service done at the weekend. temp guage has never went about normal operating levels.

anyone have any ideas???
Old 16-04-2008, 05:42 PM
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as355f1
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sounds like a fooked coil pack to me
Old 16-04-2008, 05:47 PM
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l0ubie
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yep def sounds like coil to me too!
what car is it on mate?

a fairly recent car or an older one?
Old 16-04-2008, 05:51 PM
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dodgy lead, or plug mate

poss coilpack,dizzy
Old 16-04-2008, 05:53 PM
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Charlie Chalk
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I'd say coil/lead/plug too...

what car?
Old 16-04-2008, 08:24 PM
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Car is a renault clio. its 7 1/2 years old. 1.2 8v engine. its done 57k but needed servicing as it was 12k since last one.

Is it poss for 2 leads to pack in at the same time? Rac changed the 2 plugs on 2nd and 3rd cylinders. no change to previous problems.
When running with the rac, alot of petrol was coming out the exhaust and there was drops of liquid on the gravel below and just behind it.
Old 17-04-2008, 12:27 AM
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as355f1
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then i would say 100% coil pack, if i remember the 1.2 clio is fitted with 2 coil packs 1 runs cylinder 1 and 2 and the other runs 3 and 4 sounds like one is fooked
Old 17-04-2008, 01:56 AM
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Chip
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How would a coilpack fault cause a head gasket failure, especially on something like a low power 1.2 8v engine?

Why would the gasket care there wasnt a spark?

Souds like a load of nonsense to me TBH!
Old 17-04-2008, 05:53 AM
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tabetha
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Can't see why any would run cylinders as above(as355fi), coilpacks run 1+4, 2+3, as said I don't think it is the HG, as it is so unlikely to blow two places at once(1+4).
There WILL be petrol coming out as it is NOT being consumed(burnt) by the engine when misfiring, it will make no difference to the HG if misfiring.
tabetha
Old 17-04-2008, 05:20 PM
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as355f1
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Originally Posted by Chip-3Door
How would a coilpack fault cause a head gasket failure, especially on something like a low power 1.2 8v engine?

Why would the gasket care there wasnt a spark?

Souds like a load of nonsense to me TBH!
i never said the head gasket had gone, the RAC did because it had a misfire and by the sound of it and the description he has given i would have said that the head gasket is perfectly OK and one of the coil packs is fooked which is a very common problem on clio's
Just my opinion, any decent garage should diagnose it in 20 seconds and if i am right total job should be about £100 in my past experience most AA and RAC diagnosis of problem is shite but i have never seen the car may be wrong, but there was no mention of overheating/waterloss/pressure build up in the header tank. just trying to be helpful.

Last edited by as355f1; 17-04-2008 at 05:27 PM.
Old 17-04-2008, 05:43 PM
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Tenner sayes its the coil pack let us know if we were right
Old 17-04-2008, 06:01 PM
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Bubs
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Sounds like coil to me. Renaults are notorious for coils.
Old 17-04-2008, 07:02 PM
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as355f1
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Originally Posted by steves24V's
Tenner sayes its the coil pack let us know if we were right
I will have a tenner on it also
Old 17-04-2008, 07:05 PM
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sounds like the flux capacitor has had it,only running 0.9 jiggawatts?
Old 17-04-2008, 07:23 PM
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Sounds like ignition amplifier, or a coincidence 2 have gone down at same time.
Although unfamiliar with the cars ignition system.
Old 17-04-2008, 07:32 PM
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as355f1
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Originally Posted by C4llyT
Sounds like ignition amplifier, or a coincidence 2 have gone down at same time.
Although unfamiliar with the cars ignition system.

wont have one
Old 17-04-2008, 09:32 PM
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the problem will deffo be .........the fact it is a renault
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