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Originally Posted by j cAT
first the cat failure at this mileage means your engine has big problems. unburned fuel usually causes this.
my first guess is the head gasket/heads are / have failed. check compression.
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Ok compression check looked good. I got between 100-120 psi off the first rotation and was hitting 180 by the 4th rotation on all 8 cylinders.
Quote:
Originally Posted by j cAT
check oil pressures. if the pressures are below 20 psi I would unload this vehicle.
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I don't have a mechanical oil pressure gauge to do the check so I'll go get one tomorrow. I did a complete oil change (nothing unusual about the look of the oil, no water/coolant/etc) and replaced the sending unit today but was still getting the >20psi on the dash gauge at idle. I'll get the mechanical gauge tomorrow to verify that the dash gauge is accurate.
Quote:
Originally Posted by j cAT
with 109,000miles and these failures the vehicle has not been properly maintained.
you do oil changes ? who's oil and viscosity ? what filters used ? what coolant used ? when do you change coolant ?
at 100,000 miles these vehicles are just beginning on their life cycle. many get well over 200,000 miles .
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I've only owned this thing for about 6 weeks so I have no idea about the maintenance history. At some point someone has converted it from DexCool to traditional green coolant. I am hoping that whoever did it A) knew what they were doing, and B) Did it correctly. The coolant looks pristine though so there's no indication that it's dirty/old/etc. When I did the oil change I went with 10w30. I got the oil at Oreily's and went with their brand oil and filter (on sale for $13). I'm usually a Quaker State guy but money is tight and I plan to change the oil out again in >3k miles so I went with the store brand.
On the temp gauge issue, I pulled the temp sensor plug and checked it with my test light. I got good current there and the needle on the dash moved from dead up to zero (basically it wiggled a little bit) when I grounded the plug with the test light. So I'm assuming the gauge is good so maybe the temp sensor is bad? Could it be the thermostat?