Originally Posted By: wolfc70
A slight rattle at start up is usually one of the indicators that the guides are worn/broken. I am not 100% sure of the exact model years affected, but I believe I am close.
The 4.2 liter engines have the updated chain guides. All US market 2004 MY cars had the 4.2 engine. 2004 MY production actually began in 2003, and some of the late 4.0's might have had the latest iteration of the chain guides
You are correct about the earlier cars, though. The chain tensioners were a weak point on the earlier 4.0 engines.
A slight rattle at start up is usually one of the indicators that the guides are worn/broken. I am not 100% sure of the exact model years affected, but I believe I am close.
The 4.2 liter engines have the updated chain guides. All US market 2004 MY cars had the 4.2 engine. 2004 MY production actually began in 2003, and some of the late 4.0's might have had the latest iteration of the chain guides
You are correct about the earlier cars, though. The chain tensioners were a weak point on the earlier 4.0 engines.