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Old 05-28-2010, 08:21 AM   #1
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New Jeeper. Fuel Issue?

Ok, bought a 1987 YJ, 4.2L about a month ago. Jeep looks amazing, only issue when I purchased was a sputtering/hesitation/bucking when trying to accelerate. Seemed like a cut & dry carb issue, so I upgraded to the Weber carb, rather then money on a rebuild.

Since the purchase, I have (myself) put in...
Battery,plugs,wires,dist. cap, rotor, starter,starter relay,oil change,pcv valve,ignition coil,valve cover gasket.
Then I took it to a mechanic to install the carb, and adjust it, and connect all the vacum lines correctly.

After the carb install, ran great for two days. Then, the bucking/sputtering/hesitation (and ocassionaly stalling while driving) came back. But, it only happens after about 10-15 minutes of steady driving, and only at about 35-40 mph or faster. Also, if I can fight past the bucking and keep my foot in it, 45 is top speed, no more acceleration. If I am just doing a short 5 minute trip, no problem. And if it starts happening, and I slow down to below 30, I can get home.

With all the ignition stuff I have replaced, I am thinking its a fuel issue. Could this be fuel pump? or could the brand new weber carb. be bad?
I don't want to regret this purchase.

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Old 05-28-2010, 08:25 AM   #2
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Look for a leak (even a tiny one) in your fuel pump (an all parts around and associated with the fuel). If air is getting sucked in somewhere you'll get these types of issues.

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Old 05-28-2010, 08:44 AM   #3
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I would re check the vacuum lines, those are usually where some issues pop up.
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Old 05-28-2010, 08:50 AM   #4
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Air, Fire, Fuel.
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Old 05-28-2010, 08:58 AM   #5
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thanks guys,
gonna start by looking for some fuel leaks.

Drivebytruckerz, love the name by the way....great band!!
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Old 05-28-2010, 09:08 AM   #6
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Quote:
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thanks guys,
gonna start by looking for some fuel leaks.

Drivebytruckerz, love the name by the way....great band!!
And you would know here in the "Dirty South.."
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Old 05-28-2010, 09:21 AM   #7
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sounds like water in the gas IMO

make sure your coil wire is secured really good to, sometimes I've seen 'em pop off a little on the nipple. It will run fine until you rev up the RPMs a bit.
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Old 05-28-2010, 10:01 AM   #8
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With my 89 4.2 I had the same thing happen. Replaced everything and still happened. An old mechanic told me to replace the "spark box" (Ignition Control Module). I did and it has never run better. Good luck.
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Old 05-28-2010, 12:35 PM   #9
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Woah, looked up a "spark box", couple hundred bucks! Gonna go to that as last resort. Its got a full tank of fresh gas, 93, from a different gas station then I filled it up from the last time, because I thought that might be it too (I have had a similar problem in my boat). But in my inspection, I see there is a moist spot on the blcok where the fuel pump bolts on! could this be a very slight leak, allowing gas out and air in? could this be the culprit? I am going to try and track down a gas pump to put on tonight, see if that helps.
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Old 05-28-2010, 12:47 PM   #10
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I did not see where you changed the fuel filter..
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Old 05-28-2010, 01:02 PM   #11
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Quote:
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I did not see where you changed the fuel filter..
Oh, sorry. Yea, brand new fuel filter and lines from the mechanic when he did the carb.
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Old 05-28-2010, 02:49 PM   #12
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Woah, looked up a "spark box", couple hundred bucks! Gonna go to that as last resort. Its got a full tank of fresh gas, 93, from a different gas station then I filled it up from the last time, because I thought that might be it too (I have had a similar problem in my boat). But in my inspection, I see there is a moist spot on the blcok where the fuel pump bolts on! could this be a very slight leak, allowing gas out and air in? could this be the culprit? I am going to try and track down a gas pump to put on tonight, see if that helps.
Not the one for 200.00. You can get an OEM replacement for less than 100.00. That's the one I have and there are no problems. At this point I don't think replacing it should be your last resort. I bet this is your problem.
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Old 05-30-2010, 04:40 PM   #13
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kik,
thanks for the input. I was unable to get a fuel pump anyways. I have to order it, soooo, I am going to inquire about an Ignition control module.
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Old 06-01-2010, 08:21 AM   #14
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Quote:
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Not the one for 200.00. You can get an OEM replacement for less than 100.00. That's the one I have and there are no problems. At this point I don't think replacing it should be your last resort. I bet this is your problem.
kik,
found a store that has the ignition control module in stock, going to pick it up this afternoon, and put it on tonight. I will let you know if it does the trick!
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Old 06-01-2010, 08:50 PM   #15
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Quote:
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Not the one for 200.00. You can get an OEM replacement for less than 100.00. That's the one I have and there are no problems. At this point I don't think replacing it should be your last resort. I bet this is your problem.
kik,
thanks for the input, but I replaced the ignition control module, and its still doing the same thing. Didn't even get around the neighborhood (less than 1 mile) before it jerked, sputtered, and lost power. I downshifted, saved it, than it died.

I did notice, while its doing its impression of a bucking bull, if I step on the gas, I can hear the carb "hissing", so if the gas is going through, does that mean its a spark problem.

If anyone knows what else I could replace, please let me know. Few more attempts, and this POS is up on autotrader.

So far, I have done...
Carb
fuel lines and filter
ignition control module
ignition coil
spark plugs and wires
distributer cap and rotor

what could it be???
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Old 06-02-2010, 02:21 PM   #16
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Just cause the carb is hissing does not mean there's gas going in. If the carb has a bowl drain, drain the bowl into a clear container and see if has any water in it. At this point it appears to be fuel issue.
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Old 06-04-2010, 08:11 AM   #17
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Quote:
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Just cause the carb is hissing does not mean there's gas going in. If the carb has a bowl drain, drain the bowl into a clear container and see if has any water in it. At this point it appears to be fuel issue.
It appears it may be correct, I noticed some deposits and what appeared to be fine drops of water in the fuel filter. I changed the fuel filter, added some dry gas, and topped it off with new fuel. It is still sputterig real bad, so I just let it idle for a while until it was time to shut down the garage. Going to let it run a bunch more today. Does it take a while to run all that stuff out you think?
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Old 06-04-2010, 03:03 PM   #18
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It does seem like you have a bad batch of fuel and/or water/contaminants in the tank. At this point, since the tank is an 87 a new fuel tank is probably a good idea and fresh gas.

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