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Loud Exhaust with Ticking

 
Old 05-02-2014, 01:26 AM
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Question Loud Exhaust with Ticking

Hey guys first off I'd like to say that this is my first F150 ever and so far i'm loving it. Here are some info you may need

1999 Supercab
4.6L V8 W

I bought this with already 286,000 miles on it for really cheap and it still runs strong. Just a few things I need to fix to make it even better. But like I said in the title the exhaust is loud and it has a ticking sound to it. This only happens when i'm accelerating. If i'm idle or at a constant speed the exhaust is not near as loud and there is no ticking sound.

I was told it could be the donut gasket but come to find out that there is not one on my truck. The only thing I can think of now is it could be the Exhaust Manifold Gasket or it could be cracked. Is there anything else it could be?
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Old 05-02-2014, 08:52 AM
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There's alway the possibility you have a spark plug that has popped loose but you're pretty safe to assume there is an exhaust leak. At 286K miles a cracked manifold would certainly be possible but it's usually associated with broken manifold bolts that hold it on. The only way to know for sure is a smoke test to pinpoint the leak.
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Old 05-02-2014, 12:57 PM
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Originally Posted by Marc D View Post
There's alway the possibility you have a spark plug that has popped loose but you're pretty safe to assume there is an exhaust leak. At 286K miles a cracked manifold would certainly be possible but it's usually associated with broken manifold bolts that hold it on. The only way to know for sure is a smoke test to pinpoint the leak.
How would I go about doing a smoke test? I've seen Youtube videos on using Sea Foam but I've never done this and don't want to blow my engine up.
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Old 05-06-2014, 08:16 PM
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Spraying a light oil into the intake (like WD40) will burn and create smoke in the exhaust. Its best to do it past the MAF sensor. If you have a leak or a crack in the manifold, it will show up easily. After you do the test you'll want to run the motor for a few minutes to finish burning off any excess oil so the plugs don't foul.
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