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Old 03-19-2018, 09:21 PM   #1 (permalink)
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Default 2005 Forenza - P0300 Code

Hello all,

A couple weeks ago, the car started throwing a P0300 code. Went to replace the spark plugs and and wires. Noticed that there was some oil near the plugs. When replacing #4 plug saw that the tip had oil on it. I start thinking I should replace the valve cover gasket. So I am working on that now. The issue is that some of the oil in the valve cover is a little milky.. Dip stick oil looks OK. I heard this can be caused by condensation. The car does lose coolant as the reservoir has minor cracks (replacing this too).

I rented a block tester to check for exhaust fumes in the coolant/water and was given a non positive result for a head gasket failure. The fluid did not turn yellow. How reliable are these?

I want to rule out a head gasket failure before I waste more time and money into this thing. This car has been nothing but a pain the past couple years, but I can't spend the money right now for a new car.
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Old 03-19-2018, 11:02 PM   #2 (permalink)
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Sometimes the milky substance in the oil is caused by a faulty head gasket
But, you tested it? To see if there was exhaust gas in the cooling system?
Negative should mean that gasket is good.

Have seen this happen when the car is not driven enough to heat up engine and oil
Too many short trips
As you said, it could be caused by condensation

Good luck to you
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Old 03-20-2018, 12:57 AM   #3 (permalink)
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Quote:
Originally Posted by avisitor View Post
Sometimes the milky substance in the oil is caused by a faulty head gasket
But, you tested it? To see if there was exhaust gas in the cooling system?
Negative should mean that gasket is good.

Have seen this happen when the car is not driven enough to heat up engine and oil
Too many short trips
As you said, it could be caused by condensation

Good luck to you
Thanks for the reply. It was generally used for 1.5 mile trips to work. So I guess that could be considered on the shorter side. The coolant reservoir tank was also had micro cracks so that may cause condensation as well? I already got that part and will be swapping it tomorrow.

The engine mis-fires only at low RPMs, and is fine once the speed increases. I'm tempted to run another block test on it. I did it twice on different days and both times the fluid did not change color.

The mis-fire I'm hoping is from either a leaky valve gasket or the coil. A mechanic briefly looked at it, said it may be the EGR.. He cleaned it but it didn't seem to improve, he suggested I replace it but thats a pretty pricey part.
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Old 03-21-2018, 06:48 AM   #4 (permalink)
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Hi. Yes milky oil can be a sign of head gasket failure. But it’s not definite. The pressure test was negitive so I wouldn’t worry about a head gasket yet. Get the overflow tank changed and make sure your hoses are all good first then keep an eye on the coolant level. If your still loosing coolant a head gasket would be one possibility. Now, your misfire. This is probably caused by a bad valve cover gasket. What happens is, as the car sits oil leaks into the spark plug valley and then down into the combustion chamber. When you go out to start the car there is now oil in the fuel air mixture of the combustion chamber that needs to be burned off. This can cause misfires. You need to change the valve cover gasket, when you do add a washer for each valve cover bolt. We’ve found that the bolts are a little long and can’t oroperly be tightened causing valve cover leaks. So adding the washers might stop future valve cover leaks. Also, replace the spark plugs and clean out the oil as best you can while changing them. This should fix your misfire. Let us know what happens.
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