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Old 05-21-2010, 12:39 PM   #1
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88 Jeep wont Idle

Just bought a 88 Jeep Wrangler with 4.2 carborated.. It seems like it can and will be fun but needs some work big time.. Before I go out and spend 5k on this thing I want to get to know the thing better...

This thing leaks from every gasket. From the head gasket to the exhaust manifold.

But what i wanna know is why wont this thing idle..

It seems to do ok while driving. This is a 5 speed and when coming to a stop light it will sputter and die when going to neutral.... But starts right back up easily enough..

I have messed with the idle and that does not really help.. Unless I want the thing to idle at 2k RPMs.. I also messed with the jets.. Man was this thing burning rich.. I adjusted both jets 3/4 out.. Seems to smell better anyway..

Maybe the float is sticking?

I have also readjusted the timing..

And OMFG why so many vacuum lines? Does a 4.2 need all these frigging lines?

Thanks

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Old 05-21-2010, 12:58 PM   #2
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I feel ya I have an 89 and I need some major motor help as well. I adjust my idle all the time but whatdo the jets do and where are they? I am new to being my own mechanic. THe BF helps but we do not know very much. The ex was my mechanic. oh well

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Old 05-21-2010, 01:28 PM   #3
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I would change all your tune-up stuff before fudging around to much with the carb. or timing. Like, dist-cap/rotor/plugs/maybe wires...

If your float was sticking shut, it would never run.
If your float was sticking open, it would flood with gas even just sitting there.

I'd start with simply spark plugs and inspect the other stuff while in there. Check for rats nests in the air filter assy as well.

Remember, your timing was fine before you touched it as it runs good down the road.
Remember, your carb was fine before you touched it as it runs good down the road.

Unfortunately, you've made the problem harder for yourself to find. Before, it could have been related fuel or lack of spark. Now, it could be related to fuel, spark, a mal-adjusted carb and/or mal-adjusted timing doubling your variables to have to troubleshoot.

and, Welcome to the Forum!
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Old 05-21-2010, 01:44 PM   #4
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I think the lack of idle is my least to worry about of the problems.. Everytime I look at this thing I see more stuff that needs to be done to it.. The oil leaks are bad but the water on the dip stick concerns me more.. Bad head gasket?

I think at this point I will start looking for a rebuilt 4.2.. Any suggestions?
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Old 05-21-2010, 02:10 PM   #5
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jeez mine caught fire and leaks but no water as of yet, I need to take a picture of my motor, my breather kinda got a little warped..hee hee looks funny to me...plus singed/melted tubes and wires..I am assuming at one time they were connected to something that was/is needed. runs as it is, go figure
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Old 05-22-2010, 03:32 PM   #6
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Ive got an 89 4.2 and all i can say is welcome to a 4.2 carb. Mine idles pretty rough until it reaches running temp. Most of the vac lines are useless after the engine reaches running temperature, but ALL of the vacuum lines are necessary in order for it to reach that point smoothly. I recently tore mine down to replaces the lifters and 2 vacuum hoses are now without a home and it shows. After fiddling with tuning the carb a bit (it was running veryyy rich), it idles pretty decent at bout 700rpm but id still like to know where the lines go. If you tear it down to replace the gaskets...label allll the lines.
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Old 05-22-2010, 04:54 PM   #7
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I went ahead and changed plug wires and plugs.. Bought some carb cleaner and douched it and I still have the same problem.. I cant keep this thing idling when coming to a stop..Otherwise it runs as expected...

So what should I do at this point? New carb? or rebuild?

Oh, when at running temp I can close the choke and it seems to run smoother at idle..
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Old 05-22-2010, 07:45 PM   #8
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Quote:
Originally Posted by 88JeepNoob View Post
I went ahead and changed plug wires and plugs.. Bought some carb cleaner and douched it and I still have the same problem.. I cant keep this thing idling when coming to a stop..Otherwise it runs as expected...

So what should I do at this point? New carb? or rebuild?

Oh, when at running temp I can close the choke and it seems to run smoother at idle..
These carbs are easy to rebuild. When we first got ours it didn't want to idle either. Since I rebuilt it I have not had trouble. knock on wood.
From what you said at the end of your post you are too lean at idle. If you look into your carb you will see two rods. There should be fuel coming out of both. If only one is dripping then you need to clean your carb. If you are at that point then rebuild it yourself or pick one up. The kit is only about $25.00. Also check your idle adjustment screw. The PO may have tried to play with it.
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Old 05-22-2010, 11:41 PM   #9
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Noob...try this

Found this in some archives. I have a 4.2 carbed in an 88 Wrangler. Spent some bank a couple years ago and installed a MPI system on it. It idles smooth now, but still could use some power on the top end. Good torque on the trail at low RPM.

Easy Fix for Jeep 258 Carter BBD Idle Problem

Good luck and welcome to the forum!
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Old 05-23-2010, 05:33 AM   #10
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Caeter BBD is a trouble some carb. I replaced mine on a AMC Eagle i had a few years back. I'll try to find what kind i switched to to.
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Old 05-23-2010, 10:01 AM   #11
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Thanks guys... I did end up cleaning the "cluster" yesterday with little to no luck.. It still drips..

What I have done is set the idle way up.. Like 1800 too 2000 RMPs.. Then now when coming to a stop it does not die.. It rises in RPMs..

I cant wait to get these little problems solved... There is a 4" Sky Jacker lift I wanna put on this fall...Along with some new tires...
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Old 05-23-2010, 11:30 AM   #12
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I think you answered your own question when you said it leaks from every gasket. Before you start tearing apart the carb, make sure you don't have a vacuum leak or two. You mentioned the head gasket....that should be a first if its leaking, you may be getting water in your oil, at the least loosing power and could at some point leave you stranded.
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Old 07-08-2014, 09:21 PM   #13
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Not sure if anyone is still reading this but the best solution if you have the money is to get a holly, weber or a mastercraft 2100 as the carter bbd carbs are crap. If you don't want to changer it then there is a way to fix it. The main problem is in the venturi. It clogs up and the drips when at idle so that it runs rich, causing it to choke.

Fix idle and stalling problems on a jeep cj-7 or wrangler yj

This is good instructions on how to fix this problem (has great pictures)
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Old 07-09-2014, 04:19 PM   #14
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vacuum is huge with 4.2s ck and replace ALL vacuum hoses 1 at a time. next is plugs and wires and filters......like garyk said if you think the head gasket needs replaced do it now don't blow your motor!
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Old 07-13-2014, 12:06 PM   #15
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My 89 suffered from bad idol too when I first got it. My problem was made up of a couple things that were all emissions related. Do you still have smog on yours? A lot of folks think they can remove it easily but dont understand thr inter related functions of the component and their effect on the motor. On mine, once I replaced the one way air diverter valves, reconnected the pulse air system and replaced some bad solenoids on the carb and the tri valve unit on the firewall, it ran like a champ. Also, make sure you follow the carb adjustment procedure listed on the sticker on your hood.

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