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Unread 07-07-2013, 11:46 AM   #1
Tyler980
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1988 YJ Wrangler 
 
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88 4.2 starting - help?

Alright, so I have an 88 yj with the 4.2l stock carter carb, it idles fine after start up at around 800-900... but getting it to start is a pain in the ***... the idle isn't rough anymore, doesn't sputter or anything. I just don't know why it doesn't like to start, I have a manual choke, which helps a little. The only way I get it to start at the moment is a little spray of carb cleaner in the top of the carb, and put air cleaner back on and it'll fire up.

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Unread 07-07-2013, 12:00 PM   #2
Old4X
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You are not using the proper amount of choke. Either put the auto choke back on or experiment with your manual. You are likely not closing the choke plate enough and not priming the intake enough.
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Unread 07-07-2013, 12:39 PM   #3
Tyler980
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Closed it all the way, had the same problem when I had the electric choke on there as well. Sometimes it'll start right up and then other times (Trying to start it the same as before) It won't start up. But I have thought of putting the electric choke back on.
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Unread 07-07-2013, 12:41 PM   #4
Tyler980
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Another thing, not sure if its normal... while idling, if i pull air cleaner off it stalls out like I have a massive vacuum leak? I'm told its supposed to run with or without the cleaner on
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Unread 07-07-2013, 12:54 PM   #5
superj
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It should run with or without the air cleaner.
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Unread 07-07-2013, 01:03 PM   #6
dancytron
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You are pumping the gas pedal once before you try to start it? Is it setting the high idle right? Right after it starts, it should be more like 1200 rpm or so until you push the choke back in.

With a manual choke when cold, push pedal to floor, set the choke, let off the gas pedal, and then try to start it. As soon as it starts, push the choke in an 1/8th an inch or so.

When warm (and in warm weather this can be several hours after it has last run), then make sure choke is all the way in and just start it. Don't pump or set the choke.
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Unread 07-07-2013, 01:05 PM   #7
dancytron
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Quote:
Originally Posted by Tyler980 View Post
Another thing, not sure if its normal... while idling, if i pull air cleaner off it stalls out like I have a massive vacuum leak? I'm told its supposed to run with or without the cleaner on
Are you pulling off the vacuum hoses accidentally when you take off the air cleaner?
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Unread 07-07-2013, 04:23 PM   #8
Tyler980
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No, I have done the nutter bypass, and my stock air cleaner was rusted out, I bought a air cleaner that sits right on top of the carb. I am giving it a pump of gas, it actually has been starting fine for me today :P but other times it doesn't. But the whole air cleaner removal stalling it out is still confusing me, along with stalling when I brake.
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Unread 07-07-2013, 04:24 PM   #9
Tyler980
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As for the high idle, the orange thing thats there always is facing down, it doesn't move up or down on its own, I have to set fast idle myself for it to work.
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Unread 07-07-2013, 04:49 PM   #10
Tyler980
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And I realize now in my original post I said after it starts up and idles at 800-900... it idles like that after I warm it up... it won't idle prior it just stalls out while cold.
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Unread 07-07-2013, 04:51 PM   #11
dancytron
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If it is set up right, setting the choke should set the high idle and then slowly get it down to regular idle as you push in the choke as it warms up.

If that isn't working then you need to fix it for it to start right. Some pictures of how it is set up now would help.

Not sure what "orange thing" you are talking about. The high idle cam is a white piece of plastic on mine.
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Unread 07-07-2013, 05:13 PM   #12
Tyler980
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Mine is a orange plastic piece, wasn't sure of the name. The linkage there just moves up and down by hand, when the choke opens and closes it just moves around in the opening, I tried using a zip tie to hold it still so it will move up and down when the choke opens or closes.
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Unread 07-07-2013, 05:18 PM   #13
Tyler980
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http://s1129.photobucket.com/user/Ty...tml?sort=3&o=1

You can see in the back, the orange plastic thing is down, the lever on it is straight up. If you look above there towards top of carb, you can see the linkage hooked there, it just moves freely in that opening, moving the choke it doesn't pull it up or down, in fact it didn't do it when I had the electric choke either because the only way I could keep my jeep running while stopping and such, that orange thing had to always be leveled out, so I had it duct taped, now that its not I can't drive and stop without stalling.
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Unread 07-07-2013, 06:42 PM   #14
dancytron
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Well, that seems like it is your problem. I am not sure how to adjust that. maybe shortening the vertical piece by bending it. Old4x will know.
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Unread 07-07-2013, 06:45 PM   #15
jay-h
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Quote:
Originally Posted by Tyler980 View Post
... stalling when I brake.
That's a clue. Could be a major vacuum leak in your brake booster or hose
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