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Old 09-22-2007, 07:43 PM   #1
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Help: Jeep Mechanic Needed

Hi. I have a 2000 Wrangler Sahara which I absolutely love. Recently the Check Engine Light came on and it started to run rough. There is a clicking noise coming from the engine where the #1 cylinder valve is. Sometimes it goes away. The MIL code indicated that there is a #1 cylinder misfire and I tried to decarbonize the combustion chamber using the mopar combustion chamber cleaner, but that did not seem to work. I wonder if anyone here knows a good, honest jeep mechanic that could help me identify the problem. I live in Redmond, Washington State.

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Old 09-22-2007, 07:50 PM   #2
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Don't take this wrong, but do you have those expensive Bosch plugs? I've seen these cause all kinds of problems.

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Old 09-22-2007, 08:14 PM   #3
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I just had my 60k service done by the Jeep dealer and they told me they changed the spark plug but that this did not help the noise/rough running. I am not sure what kind of plug they used. Btw, a couple of months ago I had the synthetic oil put in. I had 58k miles on it and always used the regular oil. Could the change to synthetic oil on a rather old engine cause the problem? It never had any problems before the last oil change?
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Old 09-22-2007, 08:38 PM   #4
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I am a girl and do not know much about engines. Should I change back to the regular oil or will it cause more problems?
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Old 09-22-2007, 09:20 PM   #5
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it's not the oil.
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99 sahara
4.0/np231/ax15/d30/d35
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 09-22-2007, 09:29 PM   #6
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Check the spark plug wires,cap, and rotor first. Then check compression on that cylinder and fuel.
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99 sahara
4.0/np231/ax15/d30/d35
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 09-22-2007, 10:36 PM   #7
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Couple of suggestions, as far as oil is concerned the only problem with the oil being changed to synthetic *might* be that the synthetic found some weak seals or gaskets. Check your oil level with the dipstick. It is the Yellow T handle marked 'oil' on the passenger side of the engine. Pull the dipstick, wipe it off and stick it back in again then pull it out. Do this with the engine off. If it's low add oil.
I'm not sure on the 2000 4.0L whether that uses cap and rotor with plug wires or coils on the plugs directly, If you see a bunch, 7 thick wires, of wires going to the top of the head from a round can looking thing down by the oil filter with 7 wires coming out of it it has a cap and rotor, follow the plug wires from the spark plugs back to the distributor cap and push each wire to make sure that it is seated, thats on both ends, one end on the cap and one end on the spark plug.
One thing that will make a ticking sound when the engine is cold and then can go away when it warms up is an exhaust gasket, that takes a bit more work than I think you know how to do or are equipped for. You don't say where you are but you might want to find a local jeep club and show up at a meeting, hang around with them and learn, I've never known a bunch of jeepers to turn away a fellow jeeper. The other way is to check out your local Vo-Tech and take an evening automotive repair course where they will teach you the basics, usually on your vehicle and in a clean and well equipped shop. It's a worthwhile way to spend a couple of hours a couple of nights a week learning something useful, even if you don't do a lot of work on it the course will keep you from getting taken by mechanics doing unnecessary work and charging you for it. If you do that you will also find yourself buying a factory service manual and becoming a rabid tool buyer at Sears
Doing a tune up on a 4.0L straight 6 is a 45 minute job, consists of 6 spark plugs, 7 wires, 1 distributor cap and 1 rotor plus an air filter, one spark plug socket, one 6 inch extension and a 3/8 inch ratchet, plus some dielectric grease, it's just a matter of not mixing up the spark plug wires.
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Old 09-22-2007, 11:18 PM   #8
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If you just made the switch to synthetic oil, you can't switch back. The oil will gum up, and could clog the oil pump. I think my first stop would be the place that did the tune up for you, then do what richp said, and check everything yourself. Could be a loose wire, or even a miss-gapped spark plug. The coil might be bad, but I would think it wouldn't start if that was the case. Also check the connectors to the fuel injectors, could be something as simple as a loose connection to that injector.

Hope you find it. No matter what you do though, learning more about your Jeep is the best thing you can do to keep it going forever. And some of the best mechanics are girls, so not an excuse.
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Old 09-23-2007, 07:38 AM   #9
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Okay I wasn't thinking when I typed that a 2000 has all the coil packs it could be one coil going bad. sometimes coils work well and as they get warm they don't work well or the vibrations from the motor cause problems. Happens on boat motors some times. But check the plug gap too.
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99 sahara
4.0/np231/ax15/d30/d35
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 09-23-2007, 07:46 AM   #10
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Welcome Liddy! I think what she was asking was for a honest mechanic in her area because if she's anything like me, You guys are speaking greek! =P
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Old 09-23-2007, 07:55 AM   #11
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Quote:
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Welcome Liddy! I think what she was asking was for a honest mechanic in her area because if she's anything like me, You guys are speaking greek! =P
Pm sent to her with the name a guy I worked with and the last shop he worked at. Just Hope he is still around.
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Old 09-23-2007, 08:58 AM   #12
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I just noticed 'redmond washington'. I don't know if wrangler forums here has as active a group as www.naxja.org which is the cherokee forum. We have nationwide chapters that have wrenching parties and off roading events.
Here is the northwest chapters url http://www.naxja.org/forum/forumdisplay.php?f=66
Go poke around, we usually only charge pizza and beverages if you do hook up wear old clothes and safety glasses and bring a set of work gloves. I'm in the North east myself. While you may take some ribbing about owning a shorty it's all in fun.
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Old 09-23-2007, 03:57 PM   #13
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Thanks to everyone who responded. I really appreciate your time and think you provided me with some great ideas and things to do to get me started. Have an awesome rest of the day and week, and wish me luck.
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Old 09-23-2007, 07:38 PM   #14
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Good luck! come back and let us know what happened. Oh and PICS!
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Old 09-24-2007, 06:23 PM   #15
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One more question: What spark plugs would you recommend?
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Old 09-25-2007, 06:06 AM   #16
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One more question: What spark plugs would you recommend?
Look for the white emission sticker on either the hood or firewall, it has the correct Champion plug number written right on it as well as the gap.
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Old 10-02-2007, 12:41 PM   #17
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Thanks!

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