2001 Chevy Express oil in water

Tiny
SINMAN2112
  • MEMBER
  • 2001 CHEVROLET EXPRESS
  • V8
  • 2WD
  • AUTOMATIC
  • 85,261 MILES
I found what looks like oil in my water. I found it when I went to top off the water after seeing the temp guage getting hot.
When I put the water in the res, it had little black dots surrounded by what looked like oxidation, but it was kind of grey not milky.
My check engine light has been coming on and off for a few weeks now and when it does, my little code reader implies multiple misfires.

My thoughts are that it could be a blown head gasket - no water in oil. Yet -
Thermostat - not opening enough and the water is just dirty.
blow-by in the cylinders

But I am no mechanic so that is why I came here.

Can you help a poor man out?

Thanks and God Bless,
Steve
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Wednesday, June 16th, 2010 AT 6:01 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Try flushing the cooling system and for the misfires could be one of the following

1. Defective spark plug
2. Inadequate spark/coil, defective spark plug wire.
3. Lack of compression
4. False air leakage.
5. Faulty fuel injectors.
6. Insufficient fuel pressure.
7. Contaminated fuel.
8. EGR valve that is leaking.
9. Oxygen sensors.
10. Throttle position sensor.
11. Idle air control valve.
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Wednesday, June 16th, 2010 AT 9:09 PM

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