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All About Exhaust Systems

90 messages,  Last post on Jun 17, 2009 at 1:11 PM

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What is this discussion about? Exhaust, Diesel, Fuel Efficiency (MPG), Car Warranties, Coupe, Convertible, Hatchback, Truck, Sedan, Wagon, SUV, Van

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#89 of 90 Re: 1994 4Runner Exhaust Corssover Manifold [jspiro] by allenjackson Nov 10, 2008 (9:48 pm)
Replying to: jspiro (Sep 24, 2008 2:38 pm) There are two types of manifold restriction. With manifolds in-hand, look inside one of the two "T" junction ports. You will see the slots in the main tube. That slot material is one type of restriction. The 2nd type is present in all 3 ports. Put your finger inside any of the three ports, and feel for a raised welded bead at the opening where the tube itself is welded to the flange. If you measure the holes in the engine head, and compare that dimension to the inside diameter of a clean manifold tube, you will note them to be about the same.
#90 of 90 Exhaust by 2000exped Jun 17, 2009 (1:11 pm)
I have a 2000 Ford Expedition 4.6L with about 150,000 miles on it. I was driving and I'm not positive but I think I heard a pop, kinda like a cork from a wine bottle, then I heard what sounds like a belt flapping or as I read on another post, sounds like a chopper. I pulled over and looked under the hood. A usual DIYer co-worker says it sounds like the exhaust, but can't tell for sure. It starts up fine, but the chopper sound is noticeable and loud (not like metal hitting metal). For a while before this happened I was hearing a ticking sound when it is idleing, not really noticable when driving just mostly when idleing and sometimes the truck rattled, but not all the time. Not sure if all these are tied together with the chopper sound. I've never had work done on the exhaust other than installing an aftermarket exhaust. I managed to drive it into a parking lot, but afraid it would do more harm driving it to a repair shop and until I can figure out what the problem could possibly be and have it towed. Do you have any suggestions as to what the cause of the sound could be? Could it be the exhaust manifold?

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