exhaust leak noise
03-20-2012, 09:12 AM
#1
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exhaust leak noise
I have an 01 f-150 4x4 with the 5.4L and it recently started to make an exhaust leak type of noise but I have already taken it to a muffler shop and they said I didn't have one. It sounds horrible gets worse at acceleration. Does anyone know what could be causing this noise. I've replaced the manifold gaskets and it still does it from the driver side
03-20-2012, 08:14 PM
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more than likely your about to spit a plug, just happened to me last night. mine tossed #6
out trucks arent old enough for cam phasers, those are 04+ i do believe on the 3v motors
out trucks arent old enough for cam phasers, those are 04+ i do believe on the 3v motors
03-20-2012, 11:36 PM
#4
You need to get an intelligent diagnosis of your noise. Your exhaust shop should have given you an answer as to what the problem is coming from.
03-21-2012, 12:26 AM
#5
does do it only when the motor is cold, hot - go away after a few minutes? take a large rag and hold it tight over the tail pipe and listen for the back pressure escaping, you may need some one to plug the pipe for you. Besure not to burn your hand.
03-21-2012, 12:56 AM
#6
Disconnect the drives up front to see if it is an idler, alternator, belt, water pump etc. noises. This will remove a lot of noise if they are good or bad. Also a head gasket does sometimes blow to the outside, usually they leak some oil or water to the side of the motor. If you see a blue green streak or a nasty patch of black it could be the area it is blown in. A bad intake manifold can sometimes whistle, you can find it with carb spray.
Last edited by papa tiger; 03-21-2012 at 01:24 AM.
03-21-2012, 07:43 AM
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I just replaced my plugs 1,000 miles ago and my ignition coils so that cian't be it....the noise is consecutive it does it hot, cold, warm, fresh, and gets louder and faster paced the faster you accelerate....and my local shops charge 80 bucks for a diagnostics test so I'm trying to figure it out to save some money
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03-21-2012, 09:41 AM
#8
'08f150stx
If it is a 2 valve, I don't know if cam phasers are an issue. Check the exhaust manifolds, esp. if the sound goes away when the engine warms up. Exhause shop might only check the under body exhaust.
03-21-2012, 10:57 AM
#9
When you replaced the gaskets you missed a burn on piece and the new gasket can't conform to the area. You will need to remove the exhaust manifold again, check it for cracks and repair/remove the old gasket or replace the manifold. This happend a lot to 2 piece manifolds way back when.
03-17-2014, 12:27 AM
#10
I just replaced my plugs 1,000 miles ago and my ignition coils so that cian't be it....the noise is consecutive it does it hot, cold, warm, fresh, and gets louder and faster paced the faster you accelerate....and my local shops charge 80 bucks for a diagnostics test so I'm trying to figure it out to save some money