Had noise coming from front of motor, suspected timing chain issue.after changing guides and chains, now runs rough and fast idle( 2000 rpm or so) thought we followed all protocol.

Asked by Nov 15, 2016 at 08:29 AM about the 2004 Dodge Ram 1500

Question type: Maintenance & Repair

2004, 4.7 dodge ram with 206K miles (engine was rebuilt  at 120K miles) and
has been maintained fairly well.

5 Answers

32,655

You mention chains and guides, but did you change the sprockets as well? You'll have to run some diagnosis to see what is causing the rough/fast idle.

96,265

I would check for vacuum leaks before anything else.

1 of 1 people found this helpful.

I did not replace sprockets. It was running normal before the tear down. I visually looked for vacuum lines possibly not connected, but not conclusive. I spoke to a mechanic friend today and he suggested a possible bent valve??? said to check if all cylinders are firing, if not check their compression.

96,265

If the chain had broken or you installed the new one off a few teeth it might be possible that you bent a valve. A compression test will help rule that out.

Ok, I will proceed with compression test, etc.

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