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Unread 02-10-2013, 09:11 PM   #1
BlackGallagher
Registered User
1989 YJ Wrangler 
 
Join Date: Dec 2012
Location: Reading, PA
Posts: 14
Thump, Tick, Knock

So my 89 YJ has been acting up for the last month. The first thing that started was the tranny (5-speed manual) felt like it was falling out when I would change gears. A loud thumping sound came from the back/middle of the Jeep. Usually does it within the first couple minutes of driving, then usually goes away.

Second thing is the engine ticks on and off. When the ticking gets really loud and fast, a knocking sound will start. This usually happens after driving for at least 10 minutes. The knocking only happens while I push down on the accelerator. The whole Jeep shakes violently while the knocking happens.

Any ideas on what these symptoms could mean? Treatments? I'm thinking the cold weather is doing this, but since it hasn't been warm yet here in PA I don't have any different weather to compare the cold to.

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Unread 02-10-2013, 09:26 PM   #2
USMCBuckWild
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1991 YJ Wrangler 
 
Join Date: Apr 2012
Location: Sneads Ferry, NC
Posts: 976
Sounds like a trans mount and your timing is off causing detonation and rough running exagerated by the shot trans mount.



Just a guess
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Unread 02-11-2013, 12:54 AM   #3
ROTTEN
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1994 YJ Wrangler 
 
Join Date: May 2011
Location: SGF, NY
Posts: 755
Check all your mounts
Engine trans and torque arm. Use pry bar or large screwdriver

Mine did the same thing. My engine wasn't hooked to the frame at all.
Check your manifold bolts also

Start with easy stuff

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Unread 02-11-2013, 10:14 PM   #4
BlackGallagher
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1989 YJ Wrangler 
 
Join Date: Dec 2012
Location: Reading, PA
Posts: 14
thanks for the input guys. when i get the time i'll check it out and let you know what it all was.
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Unread 02-15-2013, 05:23 PM   #5
BlackGallagher
Registered User
1989 YJ Wrangler 
 
Join Date: Dec 2012
Location: Reading, PA
Posts: 14
I could not figure out what was wrong, so I went with a pro. Got a call yesterday. "You can either get a new engine for $3,500 or we can replace the oil pump for about $1,000 but that might not fix it." Needless to say I did not get a new engine. Went with the oil pump. Jeep works pretty well now, but it still ticks now and then. No knocking, though (yet). Not getting my hopes up, but hopefully the big problem has been fixed.
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