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Old 02-09-2013, 12:25 PM
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Engine startup sounds

My 02 with 107000 miles runs great (4.0) after it warms up a few minutes. Starts up with a chugging more than a knocking sound and then smooths out and sounds great
Sounds like its underneath the engine toward the front. Should I be overly concerned are just drive it? Any advice?
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Old 02-09-2013, 01:09 PM   #2
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my 99 does the same thing. only started when i changed the oil and went to a full synthetic. ive read that thats what happens when i use synthetic. no knocks with regular oil. as long as ur oil pressure is ok. no leaks underneath all fluids r good. i wouldnt worry about any knocks or sounds as long as they go away when the engines warmed up. but thats just me.

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Old 02-09-2013, 02:15 PM   #3
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If you are using the same weight oil, synthetic should make zero difference in noise level. Maybe slightly louder lifters, but thats it. Your engine shouldn't be "Chugging" or anything like that. I really dont know much about engines, but I'm sure someone on here will be able to help. If not, I would bring it to a mechanic and have it checked out.
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