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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
It could be your cam phasers.. they make a similar "tsst tsst" sound lol
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06 F150 XLT 5.4L, Edge evo, Spectre CAI, Magnaflow Exhaust, Leveled on 285/60-18 Nitto Terra G's, Mb wheels rims, 8000k HID's, projector fog lights, Tow Mirrors, 20% tint and brow... Much more.
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.
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.
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
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.
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.
exhaust leak noise
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