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Old 01-31-2010, 05:23 PM   #1
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Jeep (heart) broke- Vaccum Problems?? or something else-Please Help

I have been trying to fix my 1990 Wrangler for 3 months and I am fed up. I have replaced the Carb, timing chain, battery, alternator, starter, filters, and such but I can still not get my Jeep running. Someone mentioned it could be a vacuum problem. Is there a diagram out there or does anyone else know what can be wrong.

The problem: When idel at a stop sign or light it stalls out. In addition from a stop if you put your foot on the gas it stalls or has very little problem. Any suggestions would be helpful. I am fed up and thinking of selling my jeep which would suck.

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Old 01-31-2010, 05:25 PM   #2
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I'll post to keep this up on the lists. I know there are people on here with the diagrams to post. You could also get a Chilton manual, it has vacuum diagrams.

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Old 01-31-2010, 05:31 PM   #3
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Thank You

Just went and ordered it thank you. If you have anyother suggestions and what the problem could be please help. I already have the Haynes Repair Manual but it has no diagrams.
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Old 01-31-2010, 06:09 PM   #4
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You said you replaced the carb. but it has to be adjusted properly. Also, check the adjustment on your carb. solenoid. Check to see if it's working. If it is bring the adjustment screw further out. Check your idle adjustment screw. Other than vacuum issues, your idle screw might be set too low. On old carbureted 4.2's they like to idle at 800rpm.
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Old 02-01-2010, 08:46 AM   #5
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i have mine ideling closer to a grand on the tach
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Old 02-01-2010, 10:14 AM   #6
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4.2 Vacuum Diagram.
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Old 02-01-2010, 10:59 AM   #7
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God I love the 80's...

So the idle "solenoid" is entirely vacuum operated (no electric signal)?


Could I get a little bit of a legend along with the diagram? What's an "EGR TVS", "TAC VAC MTR", "DUAL CTO VALVE" or "VAC SW ASM"?
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Old 02-01-2010, 01:26 PM   #8
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The solenoid, located on the driver's side and attached to the front of the carb., is electric. There is one wire that attaches to it.
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Old 02-01-2010, 04:45 PM   #9
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So when it engages it lets vacuum suck on the "CARB SOLE VAC"? What's that?
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Old 02-01-2010, 05:15 PM   #10
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Check the timing as well, if you replaced the OEM carb with the MC2100/2150 the timing will need adjustment.
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Old 02-01-2010, 08:05 PM   #11
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What you are looking at there is for the automatic choke; I'm assuming at this point you have an original carb. What I'm talking about is the solenoid that bumps up the idle when you come to a stop and/or turn on the a/c if you have it. This solenoid is strictly electrically operated. If your 90 still has one, it could have been discarded by a previous owner, unplug it and then re-attach the wire to see if you have any movement. If there is resistance it's working. Then, adjust the carb. screw that rests against it by bringing it in, thereby causing the linkage to move out which is what you want so you don't stall when you stop or turn on the a/c. All of the above assumes that your carb. is an original replacement. Your timing has to be correct along with your idle settings and air/fuel mixture screws. If you replaced the carb. I think at this point you might have to bring it to a shop that can properly adjust it for you.
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Old 02-02-2010, 10:36 PM   #12
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Thank you for the diagram. I will try the above suggestions and get back to you. I appriciate your help.

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