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post #1 of 11 (permalink) Old 12-31-2004, 04:24 PM Thread Starter
 
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Weird problem

Ok, so two months ago the CEL came on and threw the code 0406. I noticed the car was almost running without oil so of course I filled it up with around 5 quarts of Mobil Clean Drive or something. Since then I've driven roughly 600-700 miles and yesterday morning that light came on again - I checked and there was again almost no oil in the engine. Basically it's consumed/leaked over a gallon of oil in less than two months/700 miles. What the hell could make it do that? I do have another code that means "a large leak have been detected in your evaporative system!" but I don't think it's related since evaporation has to do with emissions and not oil. So after finding that out yesterday before work, I poured in the one quart I had in the garage just to get me through half a day so I could buy more on my lunch break. I bought another five quarts and poured them in, but it isn't full yet. The oil doesn't seem to leak onto the ground underneath the car and the car runs just fine and doesn't get too hot or anything. Is it possible it's depositing the oil where it shouldn't (i.e. f'in sludge in the 2.7) or what's going on here?

Any ideas?
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post #2 of 11 (permalink) Old 12-31-2004, 04:42 PM
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Hmmm, several possibilities. You may have a bad ring on one or more pistons and you are burning oil. Look at your exhaust. When the car is warmed up and it's not real cold out, the exhaust should be clear, not smoky blue. A compression test and inspection of your plugs should tell a tale. Could be a rear main seal on the creankshaft and the oil is entering the transmission area. A bad PCV valve could cause some oil to be consumed but not at the magnatude you are experiencing. You may want to check the transmission fluid level for excessive amount (check while engine is running and warmed up) but that's a little "out there" as far as troubleshooting is concerned. After the car has set for quite a few hours you may want to look at the coolant in the radiator (not the overflow tank) for presence of oil.

You are right as far as the code 0406 (Ehxaust Gas Recurculation Sensor A Circuit High) probably is unrelated, seemingly, to an oil consumption problem. You want to crawl under the car and see if you can spot any areas of excessive oil that may be getting spread around the bottom of the car from windage as you drive. Good luck, and perhaps someone else will come up with some other ideas for you...
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post #3 of 11 (permalink) Old 12-31-2004, 05:06 PM
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i had a similar problem, just not as bad. my OIL SENDING UNIT was bad, and spit out oil only at high rpms. try replacing this 17$ piece before u do anything drastic.
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post #4 of 11 (permalink) Old 01-03-2005, 07:08 PM Thread Starter
 
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Ok... new problem right now as I was driving home. When I'm stopped at a red light, the oil light starts flickering like crazy, then goes away when I start driving again. The car seems to be full on the oil I put in last week. And actually, it's only been 400 miles since my last oil change before I noticed it was almost out a couple months ago = a gallon of oil gone in 400 miles or so.

Now I'm really worried about driving the car. Why would the oil light be flickering when I just put in fresh oil only 4-5 days ago?

Opinions? :(
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post #5 of 11 (permalink) Old 01-03-2005, 07:26 PM
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Ahhh!! With that bit of information I'm agreeing with r0meo021 about the sender unit being bad. Unless you heard loud ticking and weird noises along with the idiot light, there probably is plenty of oil pressure. Actually, tghis is a fairly common problem with all makes of cars. I bet when you look at the sensor, it will probably be all oily...
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post #6 of 11 (permalink) Old 01-04-2005, 09:49 AM
 
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change your pcv valve and possibly the hose
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post #7 of 11 (permalink) Old 01-04-2005, 12:17 PM
 
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Pull your plugs right away...

See if there is oil down in that area after you pull the plugs. You may have a tube fitting seal, requiring the the tube seals to be replaced. You have a big big problem here, if you don't do some investigating.

That oil is going places. The EGR will need attention too. PCV, spark plugs etc. If the plugs show black carbon or an oily deposit on the tips then that's your problem. The other threads were right on as well, with the oil sending unit sensor being at fault.

Get it fixed right away, flush the engine, and put Mobil 1 or some synthetic in there right away.
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post #8 of 11 (permalink) Old 01-04-2005, 12:20 PM
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Quote:
Originally Posted by Treppin99
Why would the oil light be flickering when I just put in fresh oil only 4-5 days ago?
Because it 's the oil pressure sending unit that is faulty. These is a TSB on this problem also. The unit and wiring is what needs tbe changed out. THAT is why your oil light is flickering at idle/ low rpm's.
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post #9 of 11 (permalink) Old 01-04-2005, 06:27 PM
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when this happened to me the engine was was spitting out oil while driving, the pcv valve had nothing to do with that much oil leaving the motor, nor did the spark plugs, nless you completely forget to put one back in. the oil sending unit IS YOUR PROBLEM. FIX THIS FIRST BEFORE YOU GO REPLACING EVERYTHING UNDER THE SUN.
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post #10 of 11 (permalink) Old 01-05-2005, 01:03 AM
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Quote:
Originally Posted by r0meo021
when this happened to me the engine was was spitting out oil while driving
??? Care to elaborate JD?
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post #11 of 11 (permalink) Old 01-05-2005, 01:35 AM
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i would lose a quart of oil a week when the sending unit went bad, got it replaced and it never happened again.. from what i was told...

the sending unit reads oil pressure, so if it goes bad in (some ways), the pressure will cause it to leak... and when is the pressure the highest?... when you are driving! also it is in a place where if it is leaking during the drive, it wont really get n anything but the ground, so you will not see oil anywhere else but near the sending unit.
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