Just joined the site today, looking for some advice from a resident expert. I have a 92 Sahara 4.0 w/ 95K that needs some TLC. I'm the original owner, but since 2002, I've only put about 15K on it -- I'm in the Service and have had to put it in storage quite a bit. Currently I'm living overseas, and for the past several months noticed some abnormal sounds (mostly knocking) from the engine, especially when cold outside. Got a variety of opinions from local mechanics, and since I'm getting ready to put some money down, and the fact that it is 16 years old, I thought it might be worth it to have someone disassemble, clean out, and rebuild the entire engine. I never plan on selling my Jeep, and I don't mind investing some $$ to keep it healthy. Is this is good idea?? If so, does it need to be done at a Jeep dealership, or can a good mechanic do this type of work? Thanks!
Welcome to the forum. You still have very low milage for 4.0. Before you start to worry about tearing down the engine, try some low buck fixes first. I believe you have the FI on your Jeep, make sure the injectors are clean, you stated that the Jeep spends an amount of time in storage. Was the gas drained or did it get a chance to turn to varnish? I have found that for the most part you don't even need a "good mechanic" for a Jeep. I have done all the service for my YJ since I received it as an X-mas gift last year. The little vehicles are actually pretty easy to work on and not full of a jumbled mess of wires and hoses. Definality keep the Jeep if you like it. I love the attention I get on the road ways when driving mine.
Jeff, thanks for the reply. Each time I have put it in storage, I have put an additive in the remaining fuel, so I don't think that has caused any problems. Periodically, I also put some fuel injector cleaner in the tank when I fill up. Local mechanics think the problem is likely a worn valve/rod inside the engine but they would have to open it up to verify...this is what made me think maybe it is a good time to some detailed preventative maintenance. I look forward to being able to do this type of work on my own in the future, but time/circumstances don't permit right now, so I don't mind paying someone who knows what they are doing. Living in Korea, a '93 Wrangler is very uncommon -- gets a lot of attention. Not uncommon for a stranger to walk up and make an offer to buy.
welcome to the forum. a small faint knock is actually acceptable in a 4.0. if its sharp, metallic, or other things then obviously there's a problem.
my first step would be flushing the oil, buy a flush chemical for 5 bux, put it in, run for 5 mins, and change the oil... these products acutally do their job, i've torn down motors after using it, and i've also had it fix noises from sludged up motors, or a clogged oil passage.
after that, make sure a reputable mechanic verifies the engine is the problem and that the oil pressure is good. if you need a new motor i'd say buy a jasper, they have a great nationwide warranty, and there about the only worth while rebuilder out there.
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