Engine oil contamination

Tiny
JDIAZ
  • MEMBER
  • ISUZU
Isuzu Rodeo 1999, 97,000 miles, V-6 3.2 L, manual transmission 4 x 2. Since new I always used Mobil 1 synthetic oil. About 7,000 miles ago switched to Penzoil synthetic oil. It might be a coincidence but I noticed a reduction in the oil consumption (it was using 1 qt. Every 1,900 miles approx.). Since 5,000 miles ago it is not consuming any oil at all, actually the oil evel is increasing approximately 1 qt. Every 1,000 miles and it is loosing its viscosity. All the other engine fluids stay at their normal level. I suspect fuel (gas) is somehow getting into the oil. The engine check light is on, but the codes are one for the heater sensor and the other, I believe, is for the EGR valve (P1404). Engine starts and runs normal. I will appreciate your help. Thanks
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Thursday, July 26th, 2007 AT 10:16 PM

4 Replies

Tiny
JACK42
  • MEMBER
The only place I can think of that fuel will get into the oil is from a blown fuel pressure regulator. Should be on th efuel rail with a vacuum line to the intake, remove it and check for raw fuel in the hose
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Friday, July 27th, 2007 AT 8:01 AM
Tiny
JDIAZ
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Hi, thanks for your prompt reply. There is a diaphragm conected to the aft. L.H. Side of the rail. I checked for presence of fuel but there is none, it smells like gas though.
Is it possible to leak fuel from the fuel injectors when the engine is sutdown and the rail stays pressurized? Thanks again.
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Saturday, July 28th, 2007 AT 10:53 AM
Tiny
JACK42
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That is possible, but usually that willl cause rough running in the am and excessive long cranking to start in the am
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Monday, July 30th, 2007 AT 7:40 AM
Tiny
JDIAZ
  • MEMBER
After running the engine a few times, found gas in the vacuum side of the pressure regulator. Thanks for your help.
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Thursday, August 2nd, 2007 AT 9:16 PM

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