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Old 08-05-2010, 11:00 AM   #1
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New YJ Owner..Engine Issue?

Okay...New jeep owner, and new to this forum, so I apologize if this has been answered many times over. I'm also not a mechanic type, so I also apologize for any stupid things I ask or say.

I just bought an 89 Islander with the 4.2L 6 cy. Picked it up in South Carolina and drove it back to Louisiana. It drove okay accept for a few issues: one, it struggles at higher speeds on interstate. The speedometer is not working correctly (maybe related..not sure) so I can't tell at what speed it struggled. But, it seems to really struggle if I was on an incline. When I pressed on the accelerator at these higher speeds...it almost seemed to stall. Do I just need to get used to this, or is there a fix?

I've read a lot about vacuum lines, but not sure what they do. I noticed the carb on the jeep is a holley, and I don't think that is stock. Not sure that information is pertinent..but I through in just in case.

The other issue, it gobbles up gasoline. I think that may be normal though.

Any ideas you guys could give me would be greatly appreciated.

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Old 08-05-2010, 11:05 AM   #2
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I would start with the simple stuff: check the carb, check plugs etc. How many miles? Might need a new fuel filter.

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Old 08-05-2010, 02:33 PM   #3
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It's over 108,000 miles, and probably does need a new fuel filter. I think I can do that myself. I was planning on chaning out the plugs also. But about the carb..what do i look for?

Thanks
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Old 08-05-2010, 02:42 PM   #4
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Hey JR,,, I just bought a 88 wrangler and I'm in Baton Rouge, where u at? I just did a round trip to-from Fort Walton Beach and had the same issue (bogging down). I only have the 4 cyl, but same kinda deal.

I'm from the motorcycle world, but this seems like classic fuel starvation to me.

I'm gonna be dropping my gas tank soon and see if the fuel pump sock is clogged and do a pressure test. I'll let you know how I make out. Stay in touch with me if you are close. I'm mechanically inclined, but new to jeeps, so maybe I can give you a hand here and there.

Steve
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Old 08-05-2010, 02:49 PM   #5
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Hey STeve. Can't tell how glad I was to see your post. Was hoping to find someone else in BR with a YJ. Especially since I'm not that familiar with engines. I think I'm mechanically inclined, just never had the opportunity to learn.

Oddly enough, I'm a motorcyclist myself. 2002 Yamaha Roadstar.

Let's definitely keep in touch. Once i get the engine working better, I thinking Lift Kit...lol
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Old 08-05-2010, 02:52 PM   #6
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Sounds like your cat is clogging up..
climb under there and tap it couple good times to see if you can hear anythign loose in there.. Otherwise you can clean your AIC and TPS on the Throttle body which is always a good thing..
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Old 08-05-2010, 02:55 PM   #7
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Mine came with 3" of lift already. 210,000 miles, soft top, half doors, bikini top, 3 yo paint job, fresh tires, and about $2000 dollars in recent receipts. I got it out of Mobile, AL. Jeeps are tough to find in BR area. I saw one '89 on Fla BLVD and they wanted $7500 for it.

I figure if I ever want to sell this and upgrade, I'll have no problem selling it around here.
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Old 08-05-2010, 06:23 PM   #8
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Sounds like your cat is clogging up..
climb under there and tap it couple good times to see if you can hear anythign loose in there.. Otherwise you can clean your AIC and TPS on the Throttle body which is always a good thing..
Mind helping me the acronyms..what does ' cat', aic and tps stand for? Thanks
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Old 08-05-2010, 07:08 PM   #9
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Mind helping me the acronyms..what does ' cat', aic and tps stand for? Thanks
Cat is short from Catalytic Converter. the TPS is the Throttle Position Sensor and the AIC, i have no idea. Air Intake .. something.
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Old 08-05-2010, 07:49 PM   #10
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Steve..I had same problem trying to find decent priced wrangler in baton rouge. eventually bought mine on ebay. Maybe a mistake..not sure. The interior is rough but I can work on that. It's the engine I know nothing about.
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Old 08-05-2010, 09:32 PM   #11
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I also have something similar happening to me on my new jeep. On the highway I feel like my jeep starts to "fart" and boggs down and seems like it is going to turn off and forces me to down shift. I changed spark plugs and the fuel filter looks fairly new.

It is a 4cyl on 35in mudders.. :/
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Old 08-05-2010, 09:52 PM   #12
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I'm new to jeeps myself, but I've read a lot of posts talking about gear ratio. What size tires do you have? With your speed off sounds like they may be larger than stock. Not sure about the six cyl. but the four bangers def need an upgrade on the gears with any tires larger than 33". I'm not an expert on this so you should check with one on here.
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Old 08-06-2010, 12:17 PM   #13
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Originally Posted by xpocad View Post
I also have something similar happening to me on my new jeep. On the highway I feel like my jeep starts to "fart" and boggs down and seems like it is going to turn off and forces me to down shift. I changed spark plugs and the fuel filter looks fairly new.

It is a 4cyl on 35in mudders.. :/


"It is a 4cyl on 35in mudders.."

That's your problem. You need to regear if you haven't already. I'd go with 4.88's.
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Old 08-06-2010, 12:51 PM   #14
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perfectly said ^^^^^^^^^^ i've got a i-6 5s with 31's on it with 3" lift and it slows down sometimes going up an incline. just something to get used too. typically takes me back to between 60 and 65, but once done with the incline, it's back to mid 70's no problem.
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Old 08-07-2010, 07:16 PM   #15
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So..maybe stupid question. Does the 89 yj with 4.2 l 6 cyl. have a catalytic converter? I can't find it.
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Old 08-07-2010, 10:59 PM   #16
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It should have one, unless the previous owner took it out and ran a straight pipe to cover the gap. If it does have one, it will be right by the muffler (towards the front end). Look up a picture of one on google so you know what it looks like.
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Old 08-07-2010, 11:16 PM   #17
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Quote:
Originally Posted by Jrdavidson
Okay...New jeep owner, and new to this forum, so I apologize if this has been answered many times over. I'm also not a mechanic type, so I also apologize for any stupid things I ask or say.

I just bought an 89 Islander with the 4.2L 6 cy. Picked it up in South Carolina and drove it back to Louisiana. It drove okay accept for a few issues: one, it struggles at higher speeds on interstate. The speedometer is not working correctly (maybe related..not sure) so I can't tell at what speed it struggled. But, it seems to really struggle if I was on an incline. When I pressed on the accelerator at these higher speeds...it almost seemed to stall. Do I just need to get used to this, or is there a fix?

I've read a lot about vacuum lines, but not sure what they do. I noticed the carb on the jeep is a holley, and I don't think that is stock. Not sure that information is pertinent..but I through in just in case.

The other issue, it gobbles up gasoline. I think that may be normal though.

Any ideas you guys could give me would be greatly appreciated.
What size tires do you have? Could be your gearing. Stock gears with the 4.2l were 3.07. I had 31's on my yj the power was terrible on the freeway.
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Old 08-08-2010, 11:42 AM   #18
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I think I have 32 inch tires on 15x10 wheels. There pretty wide.

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