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Old 06-09-2013, 09:23 PM   #1
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Talking Jeep Score

Just scored my first jeep (project). 1990 straight six engine, manual trans. Frame is good, has a fuel delivery problem. only paid $500 title and all! Wondering if you guys have any ideas as to the fuel issue, has a carb on it?? thought fuel injection came out in the 90s? also, was going to swap the axles from on the springs to under. Any tips? thanks!

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Old 06-09-2013, 10:10 PM   #2
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Not savvy with carbs. But springs at over right now? I would leave it that's a significant lift and will flex better off road. Stock the YJs can spring under and most people want to go spring over.

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Old 06-10-2013, 08:23 AM   #3
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Lots of info on spring over mod on this forum just search.

Fuel injection on the 6 cylinder started in 1991 so you just missed. The 4.2 is a great engine and that is a fantastic price. Enjoy!
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Old 06-10-2013, 04:08 PM   #4
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the suspension now is stock, i want to swap and put the springs on the axles. what size tires are recommended for that amount of lift?
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Old 06-10-2013, 04:23 PM   #5
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I have the same engine. Mine has an aftermarket Weber carb on it. Seems a lot of guys swap over to this carb. Though I spoke to a carb guy about it, he said he prefers the stock one and can make that run better than the Weber. It also has the nutter bypass, which eliminates a lot of the vacuum lines and emissions stuff. I'd guess you just need a cleaning and adjustment if you are getting fuel to the carb.

If you aren't getting fuel to the carb check the filer (obviously) and the fuel pump. The 4.2 has a mechanical fuel pump on the left side on the engine down low.

Make sure your air filter is clean too.

Good luck!
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Old 06-16-2013, 08:09 PM   #6
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well, today i replaced the fuel pump and fuel filter, blew out the lines, and rebuilt the carb. Runs longer but still fades out when the starting fluid runs out. i can see gas spray in the carb when pumping it, but looks pretty bad. Must have been sitting a while. So im going to drop the tank and clean it all out, add fresh gas, blow the line out again and hopefully she'll purr!
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Old 06-16-2013, 08:16 PM   #7
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I would also check the vacuum lines coming off the carb and see where they back to. If not hooked up correct it will cause misfire plus poor idle.
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Old 06-16-2013, 08:25 PM   #8
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Change spark plugs? You need fire, air and fuel.
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Old 06-16-2013, 10:20 PM   #9
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Quote:
Originally Posted by Gunz n tractorz View Post
Change spark plugs? You need fire, air and fuel.
To add onto this, Cap and Rotor, 8mm Spark Plug Wires etc.
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Old 06-17-2013, 07:48 PM   #10
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guess i should have mentioned all of that, new plugs, wires, cap and rotor. Definitely a fuel issue.
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Old 06-17-2013, 08:02 PM   #11
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just posted pics if anyone was interested

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