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The Original 3/8" Ruffstuff Diff Cover!Ruffstuff Axle Simple Swap Kit!The Ruffstuff NOT Universal 4 Link Kit!

Unread 07-16-2010, 10:23 PM   #1
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1997 4.0L 6 Maintenance

New to Jeeps and forum. Great resources here. First post for me!
I have a new to me 1997 Wrangler Sport 4.0L 6 Cylinder Manual 5 spd with 33k on the engine. I unfortunately don't have any service records for the vehicle. Besides all the fun stuff(lift, tires, bumpers), what should I do to the vehicle in relations to the engine and drive train. I've seen tune up kits fairly inexpensive on the internet. Worth the time? Should I have all the fluids flushed? Engine seems to be running well although a little rough at idle. I have no experience with this particular engine so not sure if that is normal. With the age of the vehicle, not sure if normal guidelines apply or if an accelerated list of pm should be performed. Any insight would be great. Thanks

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Unread 07-16-2010, 10:30 PM   #2
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Welcome to the forum!

Go take a trip to your local auto parts store and get a new air filter, distributor cap and rotor, plug wires, champion spark plugs, and engine oil. I use 10-w30 mobil-1 full synthetic and for spark plugs don't get anything fancy. The 4.0 does not run well on those fancy double platinum import plugs. Some good Champion Single platinum plugs are good plugs.

These next ones are just bonuses:

Ignition coil pack and o2 sensors wouldn't be a bad thing. Diff. oil, tranny oil, and t-case oil could be changed. Pop open the radiator cap and take a look at the coolant. If its gross and rusty brown flush it, back flush it, and flush the heater core real good. Depending on the condition of the radiator you might want to replace it with all metal. I have a 97 and mine is disgusting and leaks out the crimps if filled to high. Flushed my system and the next day the new coolant was already disgusting again. But If money doesn't allow I wouldn't worry about it.

The 4.0 is a great engine and should actually run pretty smooth. Its an Inline 6 so it is very balanced and should not be rough. Though it does make noises so don't get to worried about that, only get worried when new unknown noises pop up.
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Unread 07-16-2010, 11:23 PM   #3
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Welcome! Read the "stickys". http://www.jeepforum.com/forum/f9/tj-forum-faq-615132/
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Unread 07-17-2010, 12:23 AM   #4
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As stated check the plug wires and see how they look before replacing, pull the spark plugs and check them, they may be able to tell yo why you rough idling. Change the oil immediately, buy a new air filter if it is dirty. Next look at the transmission fluid is it still red or brown, if it brown it's time to replace it. Coolant is the next thing that should be done, every 3 yrs it should be replaced regardless of mileage. Replace the t-case fluid, and differentials if you have no idea when they were changed, because they are often forgotten. Check you power steering and brake fluid to make sure they haven't turned to sludge, replace those if necessary.

So the short list would be engine oil, coolant, t-case, and differentials. If needed, change the other fluids.

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Unread 07-17-2010, 06:25 AM   #5
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You should also pull the front drive shaft and inspect and lube the double cardan joint. This has got to be the number 1 neglected maint. item and can cause all kinds of problems.
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Unread 07-17-2010, 07:01 AM   #6
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Welcome to JF.
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