I have a '97 K1500 LS Suburban with the 5.7 Vortec with 215K. It burns through about 1 quart/1500 miles. We go from Montana to Seattle quite frequently and it does 80-85 mph fine with all the kids and crap, and gets about 14mpg. It still starts and runs fine with no noticeable problem (no white or blue exhaust, etc). The transmission is still shifting tight or I'd just bag the whole thing. My luck, it'll go soon...
So here's what happened:
I lost a heater hose due to a broken hose clamp at the rear heater and AFAIK, only ever got it up to 210 or so F. It is possible I lost it on the way home from work the night before, but I pay pretty close attention to the gauges. Long story short, I filled up the radiator and there was some oil in the antifreeze. So it has been parked. The engine oil still looks good. I checked the compression and it goes:
8 - 110 7 - 120
6 - 115 5 - 105 (I checked this a couple of times to be sure)
4 - 115 3 - 120
2 - 130 1 - 115
I was thinking of just doing a quick head gasket job. I replaced the garbage intake seal with the Felpro set about 10K ago. There is the slightest possibility that the intake gasket is leaking, but with it being new, and the crappy compression, I'm guessing the #5 is leaking into #3 and #7.
There is also the possibility that the transmission or engine oil cooler is leaking into the radiator. I put air pressure to the engine oil side (because the oil in the radiator appeared to not be ATF) and got no bubbles or any more oil.
Some guys I respect think that it is pretty certain to be the radiator and not the headgasket.
Any ideas?
So here's what happened:
I lost a heater hose due to a broken hose clamp at the rear heater and AFAIK, only ever got it up to 210 or so F. It is possible I lost it on the way home from work the night before, but I pay pretty close attention to the gauges. Long story short, I filled up the radiator and there was some oil in the antifreeze. So it has been parked. The engine oil still looks good. I checked the compression and it goes:
8 - 110 7 - 120
6 - 115 5 - 105 (I checked this a couple of times to be sure)
4 - 115 3 - 120
2 - 130 1 - 115
I was thinking of just doing a quick head gasket job. I replaced the garbage intake seal with the Felpro set about 10K ago. There is the slightest possibility that the intake gasket is leaking, but with it being new, and the crappy compression, I'm guessing the #5 is leaking into #3 and #7.
There is also the possibility that the transmission or engine oil cooler is leaking into the radiator. I put air pressure to the engine oil side (because the oil in the radiator appeared to not be ATF) and got no bubbles or any more oil.
Some guys I respect think that it is pretty certain to be the radiator and not the headgasket.
Any ideas?