2002 Pontiac Grand Prix Head Gasket?

Tiny
KABLEDOG
  • MEMBER
  • 2002 PONTIAC GRAND PRIX
  • 3.1L
  • V6
  • 2WD
  • AUTOMATIC
  • 170,000 MILES
Bought a used Pontiac from a an ad, installed new manifold gaskets because of water in the oil. I also installed a radiator, new thermostat, new sensor, new pig tail. Gauge says engine is running hot, temp would go all the way up then down, then up and stop. I connected my ODB code reader, ODB reads same temp and fluctuates with dash gauge. I have had to add water since replacing the radiator, (2 gallons lost during road tests), bled the system till the bleeder looked like it was pissing, coolant has escaped from a new radiator cap twice during this (seems like a lot of pressure), overflow tank has a little excitement going on also, all cylinders reading 40 psi off minimum spec. Heat gun at thermostat housing reads 208, lower hose at engine reads 180. ODB and gauge read 250-253.
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Thursday, December 17th, 2015 AT 6:13 PM

7 Replies

Tiny
JOHNNYT73
  • EXPERT
IT is not uncommon for the head gasket needing replaced. Usually what happens is the previous owner or owner runs the car with the very common intake manifold gasket leak and overheats it once or numerous times, which then leads to causing the head gasket to fail.
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Thursday, December 17th, 2015 AT 6:36 PM
Tiny
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Someone told me to do a compression test, all cylinders read 60 psi, is that normal? Why would all the cylinders read the same if only one gasket blew?
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Thursday, December 17th, 2015 AT 6:51 PM
Tiny
JOHNNYT73
  • EXPERT
Is your oil still milky? Did you put the push rods back the exact same location. The push rods are different length for some cylinders.
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Thursday, December 17th, 2015 AT 6:54 PM
Tiny
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Thank you so much fir your time. Oil is not milky, it seems the intake gasket took. I know for a fact the front rods are in perfect placement, my father replaced the other rods in the other head. The book calls for minimum 100 psi, so the 60 has me confused. I verified the operating condition of the compression tool with my air compressor. Some people are telling me I have the symptoms of a bad bleed, which I could understand if it wasn't for the 60 psi.

Thanks again.
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Thursday, December 17th, 2015 AT 7:07 PM
Tiny
JOHNNYT73
  • EXPERT
You can bring a piston to top dead center on the compression stroke. Hook up the the shop air to that cylinder using your compression tester hose and listen for an abnormal hissing noise from either intake, exhaust pipe, or crankcase (oil fill cap).
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Thursday, December 17th, 2015 AT 7:12 PM
Tiny
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Yes, that happened on cylinder 4.
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Thursday, December 17th, 2015 AT 7:22 PM
Tiny
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Not sure where it came from, but it happened only with that one cylinder.
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Thursday, December 17th, 2015 AT 7:23 PM

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