Question about 1999 Ford Explorer

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Ottoniel@live.commy 99 explorer 4.0 have a noise coming from between tranny and motor i thought it was the exust but it wasnt i replaced complete muffler tailpipe manifold and still getting a noise as if it has a exuast leak please help also when i have it on park its ok but when in drive thats when you here it!

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Hello, You may have a spark plug that is loosening up. Chances are you did not work on the exhaust donut or the heat riser if equipped. When you put the engine into gear the engine will flex in its mounts. This flex can create space on the upper exhaust flange which goes to your Catalytics. The exhaust donut will get chewed up and leak.

If the flange is rusted off, they do make an aftermarket repair kit to saddle the main exhaust manifold and give you a different flange. Then you can bolt the balance of the exhaust system back together.

There is also the possibility that your EGR valve is leaking exhaust. The EGR does not open in neutral on some models. The manufacturers do this because less emissions are made at idle speeds and keeping the EGR closed will prevent stalling. You may want to check the EGR for holes or the EGR gasket.

Posted on Mar 17, 2011

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