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Unread 03-23-2014, 12:02 PM   #1
AtlantaCJ7
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Sputtering, Coughing, Loss of Power

1980 cj7

I went thru a puddle last year, it wouldn't start after got it home. I went thru the plugs, distributor, and finally the air filter. It turns out I sucked up some dirty water thruthe intake and into the carb. I changed the air filter dried out the filter pan and it cranked right up. Since then it has a loss of power and it's spittering and coughing until it warms up...like 30 min of driving to get it really warm. Any thoughts on what is making it sputter? I tried to spray carb cleaner in the carb, about 15 small sprays, hoping to clear the jets. My next thought is to replace the fuel filter. Any other help? I have a carb rebuild kit but wanted to check u guys first. Thanks

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Unread 03-23-2014, 12:18 PM   #2
moto450r
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Which carb do you have?
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Unread 03-23-2014, 12:19 PM   #3
crouse11c
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What carb do you have. I would make sure you choke is working right. You my have hurt it a ill with that water. You can remove the filter off and cup the intake with your hand not allowing as much air in. Does this help it run better?

Change fuel filter just because!!!

Check all vacuum lines and PVC valve.

I would find out why temp is not getting warm. No or bad thermostat stuck open.

I would pull carb and look for any rust at all. Clean up the carb good. If you find any rust rebuild or replace.

That is where I would start if all these check out we move on. Also how does it idle when does it like to mess up.
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Unread 03-23-2014, 07:23 PM   #4
AtlantaCJ7
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I'll cup the carb, I haven't tried that. It's the standard carb. I replaced the fuel filter, it didn't fix it, which i didn't think it would but can't hurt.

I drove it for 10 min sputtering at low speeds, everytime losing power. It definitely feels like like an air/fuel thing.

I don't know how to check the choke or the vaccum lines...

I can take the carb off, no problem, how would u suggest to clean the carb? Completely rebuild or clean it w carb cleaner? Soak it or other?
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Unread 03-23-2014, 08:00 PM   #5
crouse11c
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Cupping the intake when running will acts as a choke limiting the air that is getting in. It will also run better if there is a slight fuel issue. It doesn't always help. But if it makes a differance then I point at fuel or carb.
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Unread 03-24-2014, 06:11 AM   #6
Mike Romain
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With that much water around, I would first check out the distributor cap inside looking for carbon tracks. Second I would check the gas tank vent by driving with the gas cap cracked open. The vent canister has an air filter on the bottom.

If those don't show anything, I think I would next do a compression check. Water can damage pistons. If a sparkplug got steam blasted, it will look way cleaner than the rest.

Last I would be looking to the carb.
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86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
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Unread 03-24-2014, 10:52 AM   #7
86cj74.2L
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If all else fails I'd look at the ICM and coil.

Is there goo tracks running down from where the ICM mounts?
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Unread 03-24-2014, 02:50 PM   #8
AtlantaCJ7
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you think i have a compression problem? THat would suck. I looked at the spark plugs when it first happened and wouldnt crank, and they didnt look like they got steam blasted. Hopefully thats not it. i have been figuring its a fuel/air issue, ie a carb issue. granted i'm not the most knoweldgable, but whats the easiest way to rule 1 or the other out? Is there a way to really clean the carb out without having to totall rebuild it?

I drove it last night, and it starts up fine, although it takes 2 times each time to start it up. It sputtered intermittently until what i feel was when it was warm, which was 5-10 min, and it was noticably better...then i went to the store, and it drove almost 90% perfect after that...i didnt go up any big hills, but i felt like it had a good bit of power...i am wondering if this has to do with the engine warming up?

thnaks
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Unread 03-24-2014, 03:10 PM   #9
LumpyGrits
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Check for damaged/bent p'rods. Sounds like you had a hydro. lock to some extent in the engine.
Do a compression ck.
LG
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Unread 03-24-2014, 05:37 PM   #10
Matt1981CJ7
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Quote:
Originally Posted by LumpyGrits View Post
Do a compression ck.
LG
This^^^^
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Unread 03-29-2014, 08:27 AM   #11
AtlantaCJ7
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Appreciate everyone's insight....some problems have simple solutions. I googled cleaning the carb, and took the Venturi out, spray the heck out of that w carb cleaner and she runs like a dream. Thanks for the help. I highly recommend that solution on anyone that has an idle issue, it seems to be a very common thing w the carter bbd. That's saves a ton of cash.
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Unread 03-29-2014, 10:16 AM   #12
Mike Romain
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Quote:
Originally Posted by AtlantaCJ7 View Post
Appreciate everyone's insight....some problems have simple solutions. I googled cleaning the carb, and took the Venturi out, spray the heck out of that w carb cleaner and she runs like a dream. Thanks for the help. I highly recommend that solution on anyone that has an idle issue, it seems to be a very common thing w the carter bbd. That's saves a ton of cash.
Lots of us also drill out the crimped end on the venturi tubes to 32 thou. This really helps let any dirt pass through. I use a set of welding torch tip files for this, but they do sell mini drill bits that size.
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86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
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Unread 03-29-2014, 12:41 PM   #13
86cj74.2L
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There are a lot of different idle tube drilling size threads. Most of them asking the question.

I settled for .037 on the ones I drill out.
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