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Old 12-24-2009, 02:48 PM   #1
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Stalling on deceleration

I have an 87 YJ with 4.2L/5 speed. I just got this a couple of days ago. The guy said when you slam on the brakes it will stall. Well, I've discovered any time you decelerate hard it stalls.

The stock air filter has been replaced with an Edelbrock, and many of the vacuum hoses have been disconnected. There's no decel valve, and the hose going to that valve has been plugged.

So, could the missing decel valve have anything to do with it stalling, or do I need to look somewhere else?

Thanks for any help!!

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Old 12-24-2009, 03:00 PM   #2
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stock carb? the floats tend to bounce and flood out or shut off fuel. one of the real carb guys will pop uo and tell you more. my 89 used to give me hell on washboard roads and at extreme nose up angles.

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Old 12-24-2009, 03:01 PM   #3
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Yes, stock carb. I know, someone will tell me to replace the carb with a weber, but that's not an option right now.
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Old 12-24-2009, 03:30 PM   #4
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wish i could help more. i ended up putting the webber on mine. i would think there has to be a way to lessen the floats "bounce".
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Old 12-24-2009, 03:33 PM   #5
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ok i would say the vacuum sounds like something to look into. but the carters are notoriously bad at doing weird crap. i'd say clean the carb out good and make sure the fuel filter is clean.and see were that gets u if that's all good see if u can reconnect that vacuum and tell us what u find.
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Old 12-26-2009, 08:55 AM   #6
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Start with the easy fix. You might have a carb. solenoid that needs to be adjusted, or, it may not work at all. Look to the front of the carb on the driver's side. If it's working bring out the piston and this might just solve your problem.
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Old 12-27-2009, 11:17 PM   #7
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Well, I pulled apart the carb and cleaned the venturi's. That didn't change anything. I think the solenoid may be the problem. I finally got a second pair of eyes to help me, and he says the piston shoots forward when I hit the brakes. It is sticking pretty bad. I'll pull it apart tomorrow and see. Thanks for the info!
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Old 01-02-2010, 02:10 PM   #8
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I think I've finally fixed the problem. After adjusting the timing, double checking all of the vacuums, cleaning the carb etc. I finally adjusted the idle mixture screws. I put them all the way in, then backed out 1.5 turns and now it doesn't stall.

Now on to other problems!

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