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Old 06-03-2021, 08:41 AM   #1
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Default 1991 D21 Trouble shooting

I have little to no experience working on trucks and cars so I have no idea what I'm doing but I do know some stuff. I'm Unsure what these problems could be. Engine sounds like it has metal clanking in it possibly timing chain related? The exhaust system is detached from the pipe, does have a cat and muffler but it constantly makes misfiring sounds and puffs when idle along with accelerating, any suggestions? Not sure if the video I have will help much but it's the best I could think of. It also developed a popping noise a few days ago, not sure where its coming from but sounds like the rear where the exhaust is possibly cv joint. any help would be greatly appreciated


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Old 06-03-2021, 10:11 AM   #2
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Hard to tell if it’s timing chain or the hydraulic lash adjusters....sometimes called “lifters” generically. It is likely a combination of both.

If it is the timing chain it needs to be fixed immediately. The chain is very likely hitting the timing cover and cutting through it.
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Old 06-03-2021, 11:44 AM   #3
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The OP needs to take a mechanics course, and get some friends who know how to work on cars! "Old school" ways still work ...
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Old 06-03-2021, 11:45 AM   #4
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Originally Posted by alabama_lowlife View Post
Hard to tell if it’s timing chain or the hydraulic lash adjusters....sometimes called “lifters” generically. It is likely a combination of both.

If it is the timing chain it needs to be fixed immediately. The chain is very likely hitting the timing cover and cutting through it.
Okay I will go ahead and take some pictures of the timing chain and look to see if the lifters are loose later today. As for the sputtering/puffing what do you think that could be caused by?
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Old 06-03-2021, 11:50 AM   #5
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Originally Posted by LugNut1990 View Post
The OP needs to take a mechanics course, and get some friends who know how to work on cars! "Old school" ways still work ...
I would love to take a mechanics course I have to finish school though, and sadly I don't have any friends that know anything about cars/old trucks.
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Old 06-03-2021, 12:32 PM   #6
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Where in OR are you?
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Old 06-03-2021, 12:43 PM   #7
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Where in OR are you?
About 10 miles west from Eugene. In the Veneta area.
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Old 06-03-2021, 01:18 PM   #8
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About 10 miles west from Eugene. In the Veneta area.

I'm about an hour south of you. Might be able to help you if you get stuck with something.
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Old 06-03-2021, 01:23 PM   #9
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I'm about an hour south of you. Might be able to help you if you get stuck with something.
That would be awesome. I will probably be on this thread pretty consistently so if anything really horrible happens that stops my truck from running I will put it in the thread
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Old 06-04-2021, 01:25 AM   #10
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Sputtering could be a vacuum leak, a bad injector, or the ignition timing could be off.

Follow the link below in my signature and get the service manual for your truck, then start browsing the EC section. There will be troubleshooting steps in there.

Or just go here and save the document to your device after it downloads:


https://www.nicoclub.com/service-man...truck_1990.pdf
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