Burning Smell and Slight Knock - DodgeIntrepid.Net Forums - Dodge Intrepid, Concorde, 300m and Eagle Vision chat
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post #1 of 6 (permalink) Old 10-15-2016, 07:55 PM Thread Starter
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Burning Smell and Slight Knock

2000 Chrysler LHS, 75,000 miles (120,000 km).

Got the car at 60K, no oil was leaking, drove nice. I was using Castrol Titanium, which I have always used and is recommended by Volvo for my XC60. Made a change to Mobil1 because it was on sale and it seems like oil started seaping from everywhere. I have a burning smell from it.

My mechanic changed the camshaft thrust plate seals as they were for sure leaking. After that I could still smell burning and my mechanic changed the valve cover gaskets which appeared to be leaking too. Since getting it back I still smell burning oil, brought it back, they cleaned everything up and said it seems to be coming from the head gasket, which is concerning to say the least. Of greater concern, ever since the valve cover gasket change, when the car is warmed up, I noticed a knock with the hood open, it is hollow sounding and low frequency. It isn't very loud to be honest, but worrisome.

For the leak, I had a look underneath, I see some oil around a bolt connecting a black piece from the starter to the block, I see oil stains around where the diff. Meets the transmission and the stabilizer bar seems to have oil stains along it. It is really hard to localize anything specific. I have never heard of external oil leaks from the head gasket, so I am at a loss.

For the knock, it is not loud at all and the car makes decent power. I have noticed a slight miss/stumble since the valve cover gaskets were done, but just barely. Does this sound like a bearing issue? Could the mechanic have done something that is causing this could it be spark plugs or ignition related?
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post #2 of 6 (permalink) Old 10-15-2016, 09:46 PM
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The head gasket leaking oil is very unlikely, they rarely leak on these cars, and when they do, its usually internally and its coolant.

I would powerwash the engine the best you can, and get everything cleaned up. Check the oil cooler lines, and tee fitting next to the oil filter, those are common leak spots; and double check the areas repaired to make sure they are not leaking.

Also, sometimes, if the leak was going on for a very long time, it can take some time for the oil to burn off the exhaust manifold, especially if it has built up each time you drove the car. I would wait at least two weeks of normal driving for the smell to disappear.

The knock, very hard to say without hearing it; could be one of the idler pulleys in the front, first thing I do on a light knock is to remove both belts, start the engine, and see if its still there.

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post #3 of 6 (permalink) Old 10-15-2016, 11:10 PM Thread Starter
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Thanks, the idler pulleys are pretty new, I changed them in March. I guess I will keep driving it for a while and see. I switched back to the Castrol titanium, hopefully that helps too.

For the knock, I don't know, there are no codes and power has been good, I'd have trouble believing it's main bearings or other major engine internals as I would think I'd be seeing other symptoms. I guess I will listen around with a screwdriver.
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post #4 of 6 (permalink) Old 10-17-2016, 07:12 PM Thread Starter
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Inspected the car, found that the AC bracket that is loosened to remove the passenger side valve cover was left partially unscrewed. I cinched that down and the knocking decreased significantly. Unsurprisingly, I still heard a very slight knock (Probably since I have been paying so much attention). I listened around with a screwdriver and it is loudest when I listen to the middle cylinder on the passenger side through the valve cover (I didn't listen underneath). It isn't a pinging or clanging, just a hollow knock. It is so slight however that it has probably been there forever and attributable to the age of the vehicle. As long as power is there, oil isn't burning and fuel consumption stays reasonable, I will leave it. Does that make sense? I'll probably check the spark plugs just to be sure it isn't a loose or damaged plug.

As for the smell, nothing new, still seems to be there. It only smells after being on the highway or after driving it hard. It seems that after I stop and idle for a while, the smell dissipates significantly.
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post #5 of 6 (permalink) Old 04-18-2017, 03:46 PM Thread Starter
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Well, finally found the burning smell... Was poking around today to find that the high pressure line for the AC was up against the exhaust manifold. Took a cable tie and secured it away and all is good!

As for my knock, I ran Seafoam in the intake, gas and oil, also ran a quart of tranny fluid in the oil. Changed the oil and it is gone for the most part. If I drive it really hard, it will come back, but goes away after idling for a bit. I don't like it, but the car drives well otherwise and at this point I'm not really driving it hard anyways.
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post #6 of 6 (permalink) Old 04-27-2017, 12:33 AM
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That is very scary to have experienced a major leak one after another. However, I doubt that it has anything to do with the oil brand change. I also think that the issue lies from within because the gasket is always very unlikely to be the cause of any major leakage as you are able to see it from outside. Try visiting another workshop to have a second opinion.
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