noise on accelaration
noise on accelaration
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Joined: Jul 2010
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From: Media PA
You don't say what engine you have, but I'm going to assume the V-10.
Take a look around your exhaust manifolds, check to see if you have any broken/missing studs/bolts, don't panic they are a common issue on these motors. A broken stud can lead to an exhaust leak that may be giving you that sound, there may be signs of soot buildup around the head to manifold mating joint. Dealing with broken studs can be a real hoot
, look in the Tech Folder at the top of this forum for a couple of threads on manifold stud removal and header installation.
Another strange noise on these motors is a metalic vibrating sound while accelerating around 1800-2200 RPMs, this is from the sheet metal cover on the bottom of the the torque converter, it can be removed to check if it is the noise maker and a little bending and retightening should quiet it down when you put it back on.
Take a look around your exhaust manifolds, check to see if you have any broken/missing studs/bolts, don't panic they are a common issue on these motors. A broken stud can lead to an exhaust leak that may be giving you that sound, there may be signs of soot buildup around the head to manifold mating joint. Dealing with broken studs can be a real hoot
, look in the Tech Folder at the top of this forum for a couple of threads on manifold stud removal and header installation.Another strange noise on these motors is a metalic vibrating sound while accelerating around 1800-2200 RPMs, this is from the sheet metal cover on the bottom of the the torque converter, it can be removed to check if it is the noise maker and a little bending and retightening should quiet it down when you put it back on.
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Joined: Aug 2003
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From: Isanti, MN
Most of the Excursions aren't OBDII compliant, and these models will not set the CEL for a misfire code. My X had two misfire codes present when this happened, yet the light never turned on. Needs to be scanned anyway. 
Fleet Mechanic
Joined: Nov 2007
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From: Colorado
Yep. Just last week I decided to scan my truck and discovered two misfire codes. Like Tom said, they do not trip the CEL.
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i do have one broken stud on the drivers side exhaust manifold but no balck spots or soot around it so idk still stumped, i was told too that the boots on the plugs go bad and it could be a jumping spark too ?
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From: Isanti, MN
You could try changing out your plug boots and checking the plugs.
Post Fiend
Joined: Mar 2009
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From: Mt. Shasta California
You don't have new ones in there but you are asking about a miss?
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