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What’s the OBD scanner on and pull a code that told me had a bad oil on one of the cylinders. Found the coil and it was just loose because the retainer clip is broken. So now the idling rough problem is resolved but the engine knock is still there. Had a Ford mechanic friend take a listen and he...

What is IAC?

Yes it is iding rough, wanting to die a bit, and seems to have a bit of power loss. I will put an OBD II reader on tomorrow and see if I can get some codes.

So I finally finished this job. I found a broken guide and replaced it along with the other guides and tensioners. Put it all back together and started it up and still had the same knocking sound. Exact same sound. I didn’t replace the chains or check/set timing. Ugh.

Thanks that is some very helpful info. I’m not a mechanic but mechanically inclined and the more of this I do the more confident I get. “My old man, is a TV repairman, he has this ultimate set of tools. I can fix it.”

Pretty sure it’s the lower timing chain guide driver’s side. I was able to pull it off the fitting on the block and put it back on pretty sure there’s supposed to be a bolt that fastens the guide to the block. I just wanna be at least 98% sure before I tear into this huge job. 1st vid is the...

Great input thank you. I’ll be running through this tomorrow morning. Fun.

Plus isn't that an OHC motor? Won't it affect the cams or timing or anything if I run the motor with the serp belt off?

Once the belt is off what conclusions am I looking for? If it still has the knock/or not what does each mean?

Just to clarify there was a knock present before the tensioner was changed. It was determined the failed tensioner was the cause of the knock and replaced. A new knock has now surfaced after about 3 weeks after the tesioner was replaced.

2003 Merc Mountaineer Premier 4.6 The engine was knocking about 3 weeks ago and it was determined the belt tensioner failed so i changed that. I didn’t change the belt at that time. Now a few weeks later the engine is knocking but I can’t ID where it’s coming from. Its definitely a knock (not a...