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Evo 8 Overheating While Driving, Temp Goes Up Then Down

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Old Sep 20, 2016, 12:07 PM
  #16  
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Originally Posted by Evo_Goodness
Is the side tank reservoir bubbling that's a good sign of head gasket failure just because the compression check was all within 5 psi doesn't mean that the head gasket isn't failing
I get no bubbling in the overflow, just normal engine vibration.

Originally Posted by Tekniq
If the head gasket test comes back inconclusive I'll give this one a shot.
Old Sep 20, 2016, 11:15 PM
  #17  
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RIP. Head gasket blown. It's a slight leak, but a leak nonetheless.

Going to do water pump/Gates racing T belt with idlers and tensioners, ARP head studs, Cometic head gasket.

Can anyone else think of anything I should do while the head is off as far as general preventative maintenance, $5 part $1000 labor kind of things?


I'm guessing that the head gasket was just done after 150k miles, but the previous owner never noticed due to the fact that the car was never pushed hard and driven in a colder climate so it never overheated, and there are no fluids mixing.
Old Sep 21, 2016, 05:30 AM
  #18  
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That sucks I had a feeling it was the head gasket from the way you had described it but at least it's not head gaskets on a Subaru that sucks. The hole damn motor has to come out on those at least on the 4g63 it's a day or 2 max to get it done
Old Sep 21, 2016, 05:33 AM
  #19  
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Btw I would also get the head decked just in case it's warped at all from heating over heating most of the time if it's leaking you will need to deck it from my understanding
Old Sep 21, 2016, 02:12 PM
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Grind the valves, replace any loose valve guides and new seals.
Old Sep 21, 2016, 09:55 PM
  #21  
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Originally Posted by Evo_Goodness
Btw I would also get the head decked just in case it's warped at all from heating over heating most of the time if it's leaking you will need to deck it from my understanding
Yeah, of course with any head gasket job the head needs to be measured with a straight edge and usually decked.
Old Sep 24, 2016, 01:49 AM
  #22  
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Originally Posted by astral
Yeah, of course with any head gasket job the head needs to be measured with a straight edge and usually decked.
Figured you know just throwing it out there
Old Sep 24, 2016, 10:33 AM
  #23  
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Originally Posted by Evo_Goodness
Figured you know just throwing it out there
Old Sep 24, 2016, 02:52 PM
  #24  
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Compression/Leak down B4 pulling the trigger on the parts cannon.
Old Nov 26, 2016, 07:59 AM
  #25  
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Sounds like air in the system. Keep burping it.
Old Nov 26, 2016, 08:31 AM
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Originally Posted by Chris Smith
Sounds like air in the system. Keep burping it.
I guess you missed the part where he said it was the head gasket.
Old Nov 27, 2016, 04:50 PM
  #27  
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Upgrade valve springs kiggly, GSC, etc..
Replace throttle body shaft seals.
Replace and zip tie all vacuum lines.
Port intake manifold ( optional ).
Replace injector Orings and seals.
Send the injectors out for cleaning/ or upgrade.
Egr mod.
Catch cans (optional).
Tune.
Old Nov 27, 2016, 05:00 PM
  #28  
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Re torquing the head often fixes it...........no parts required.
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