Exhaust brake problems
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Tuned
Joined: May 2009
Posts: 321
Likes: 4
Exhaust brake problems
For the 3rd time now, going about 55-60mph, down hill, my exhaust brake kicks in extremely aggressive. Shoots my rpms up to 4k, and my coolant leaks all over the place. I loose about half a gallon of it each time. It's really begining to worry me. Any thoughts?
Towing in tow/haul mode, switch it out immediately, but it's too late. Coolant loss.
Any reason this would be happening? How to diagnose or fix?
5th'er dials in at 18k lbs.
Towing in tow/haul mode, switch it out immediately, but it's too late. Coolant loss.
Any reason this would be happening? How to diagnose or fix?
5th'er dials in at 18k lbs.
More Turbo
Joined: Jun 2007
Posts: 537
Likes: 3
From: Carvel, AB, Canada
Unles you have added an aftermarket one, you don't really have an exhaust brake on your truck. The transmission is merely gearing down. If you are losing coolant during this, I would believe your heads are lifting and/or your head gaskets are toast.
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Tuned
Joined: May 2009
Posts: 321
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If it was the head gaskets, wouldn't I see white smoke. Specially under such heavy load?
Is there a way to verify it is or it's not the head gaskets?
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Tuned
Joined: May 2009
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I'm on my second cap in 6 months. First one I though maybe defective. But now second, can't be.......so I decided to post here.....
More Turbo
Joined: Jun 2007
Posts: 537
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From: Carvel, AB, Canada
Sorry, but it sounds like you have exhaust gases getting into your coolant passages. Really the only way this can happen in such volume is if your heads are lifting or you have a gasket blown. Either way, you will have to replace the head gasket. I would try the cap, but the chance of that causing it are pretty slim given the description you are giving. High RPM shouldn't really increase the pressure in the cooling system that much. Have you checked if you have any cross contamination between oil and coolant?
More Turbo
Joined: Jun 2007
Posts: 537
Likes: 3
From: Carvel, AB, Canada
You would only be getting smoke if the coolant got into the combustion chamber. Sounds to me like you have combustion gas going into the coolant. You may also want to inspect the EGR coolers.
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From: Frederick, MD
hg issue I am afraid. Good news is it sounds like you can nurse it along before you have to do the repair.
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To test EGR coolers ... on a cold engine pull the EBP sensor near horizontal cooler and then pressurize the cooling system. Wait 15 minutes or so to see if any coolant appears.
More Turbo
Joined: Jun 2007
Posts: 537
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From: Carvel, AB, Canada
Not the expert on this, but I would assume that because the combustion gases are escaping, the engine can rev more freely. Furthermore, the electronics are probably telling the engine to go for even higher RPM as it's not seeing the deceleration that it is anticipating.
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Tuned
Joined: May 2009
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Nothing so far. Have to take it in to see what's the deal. I stopped driving it until I have some cash for the head gasket in case it does end up being that.
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