Fluctuate in compression
2005 Hyundai Coupe 2.7 v6

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Damian
Driver
2 points

Problem added: Apr 7, 2021 (2 weeks ago)
Fluctuate in compression on cylinder 4 and 6 one minute they r 160 psi and next only 60 psi and that head is getting hot

Car details
Car: Hyundai Coupe
Variant: 2.7 v6
Model Year: 2005
Category: Engine & Drivetrain
Replies and Fixes
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whittingehame
Legend
18,349 points

Apr 7, 2021 (2 weeks ago)
Sounds like head gasket blown between those two cyls. and one feeding the other .
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Damian
Driver
2 points

Apr 7, 2021 (2 weeks ago)
Replying to post by whittingehame:
Sounds like head gasket blown between those two cyls. and one feeding the other .
So with the head gasket blown would that course oil residue on top off pistons 4 and 6 and put like a golden colour on everything under rocker cover thanks for your time and knowledge
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whittingehame
Legend
18,349 points

Apr 7, 2021 (2 weeks ago)
With pistons 4+6 not firing right due to low compression very likely you will get oil on top of pistons . If the head gasket is not only blown between the two cyls but also blown at water jacket or head damaged , it will mix with engine oil and turn a kind of light coffee colour .It can also go into the sump and show on dipstick . You can also get oil on pistons if valve stem guides / seals are worn but this is something that should be done if head coming off to replace the gasket . You should also get the cyl head pressure tested for cracks or damage before replacing gasket . A block test will confirm if head gasket gone .
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