Love tha Jeep!!

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HowardT64
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Love tha Jeep!!

Post by HowardT64 »

Been out running errands, got gas, topped off fluids...man this beast runs nice :) Its raining and cold....Texans here have on jackets, i am in shorts :)
Anyhow, just checking in:)

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Stuka
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Re: Love tha Jeep!!

Post by Stuka »

Its always nice when the vehicle you love is running good :)
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Pevious Jeeps: 1981 J10, 1975 Cherokee, 2008 JK, 2005 KJ, 1989 XJ

candymancan
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Re: Love tha Jeep!!

Post by candymancan »

Mine died on me last night at a red light.. It was 40f, just got out from the movies. I didnt warm up the Jeep instead i drove off and half a mile down the road there was a red light.. Soon as it turned green and i stepped on the gas it died. Had to pop it in neutral and started fine and drove fine. Guess i should have let it warm up a bit before i drove it.

I noticed my carb doesnt like temps 40f or under. This morning one pump started it like normal it revs up high idle but a split second later idle drops down quickly until it dies and i have to pump it again and it starts and runs fine then. Did this last year too, even with 3-4 pumps itll start cold go to high idle but then idle drops till it stalls, then the 2nd start it idles fine
1998 Jeep Grand Cherokee 5.9L Limited 219k
1998 Jeep Grand Cherokee 4.0 I6 laredo 430k
1990 Jeep Grand Wagoneer 155k
1976 Jeep J10.. 85k(repaired)
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HowardT64
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Re: Love tha Jeep!!

Post by HowardT64 »

Wonder why it does that? I can bust mine over in the morning and drive right off...it purrs right along.
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candymancan
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Re: Love tha Jeep!!

Post by candymancan »

I dunno. only does it when it really cold outside
1998 Jeep Grand Cherokee 5.9L Limited 219k
1998 Jeep Grand Cherokee 4.0 I6 laredo 430k
1990 Jeep Grand Wagoneer 155k
1976 Jeep J10.. 85k(repaired)

KJ Ryu
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Re: Love tha Jeep!!

Post by KJ Ryu »

candymancan wrote:I dunno. only does it when it really cold outside
If you have an electric choke, turn the key to the 'run' position, pump the pedal once, then start it. If that doesn't keep the idle high (or if you don't have electric assisted choke) you may need to adjust your high idle setting.
Ron

2005 KJ, Hit-n-Run, 2am 6-17-2012, Totaled. :mad:
1977 SJ J10, 4v360, T18, D20, 37x14s, SOA & SF on tons, still ugly.
1978 SJ Wagoneer, 4v360, QT, 33x12.5s, lift by Sawzall :-bd NOT Running :(
1977 SJ J10, SniperEFI 401, QT, D44s, 31X10.5s :fsj:
2006 KJ
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candymancan
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Re: Love tha Jeep!!

Post by candymancan »

Yes i lnow thats how i always start it. only takes 1 pump.. But in really cold weather it starts.. goes to high idle but then idle drops until it stalls. Then when i start it again its fine.

Already adjusted the high idle screw. it isnt that.. Itll go to 1200 rpm or so and then drop quickly to 1100 900 700 500 300 and die
1998 Jeep Grand Cherokee 5.9L Limited 219k
1998 Jeep Grand Cherokee 4.0 I6 laredo 430k
1990 Jeep Grand Wagoneer 155k
1976 Jeep J10.. 85k(repaired)
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Stuka
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Re: Love tha Jeep!!

Post by Stuka »

Sounds like the carb is running out of fuel momentarily. Could be back siphoning to the tank, or evaporating out. There is enough to start, but not enough to run.

Woulnd't hurt to check the choke positioning as well.
2017 JKU Rubicon
Pevious Jeeps: 1981 J10, 1975 Cherokee, 2008 JK, 2005 KJ, 1989 XJ

candymancan
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Re: Love tha Jeep!!

Post by candymancan »

Yea it happens a lot, thats the first time its died but often if i dont let it warm up and just drive off itll want to die but then sputter back to life when im in the middle of the road
1998 Jeep Grand Cherokee 5.9L Limited 219k
1998 Jeep Grand Cherokee 4.0 I6 laredo 430k
1990 Jeep Grand Wagoneer 155k
1976 Jeep J10.. 85k(repaired)
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HowardT64
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Re: Love tha Jeep!!

Post by HowardT64 »

that is odd....weak fuel pump? (just a shot in the dark)
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candymancan
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Re: Love tha Jeep!!

Post by candymancan »

Only does it once too. Like yhere isnt enough fuel lile he said but then it wont do it again until its been sitting a day or overnight.

Oh well damn carberators lol..
1998 Jeep Grand Cherokee 5.9L Limited 219k
1998 Jeep Grand Cherokee 4.0 I6 laredo 430k
1990 Jeep Grand Wagoneer 155k
1976 Jeep J10.. 85k(repaired)
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HowardT64
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Location: Athens,Texas

Re: Love tha Jeep!!

Post by HowardT64 »

Someone once told me that the gas gets sucked back down into the tank? Does that sound right?
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kansasboy001
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Re: Love tha Jeep!!

Post by kansasboy001 »

HowardT64 wrote:Someone once told me that the gas gets sucked back down into the tank? Does that sound right?
Can happen if the fuel pump's internal check valves go out. Easy fix is to get an inline anti siphon valve and put it between the pump and the filter
1983 Cherokee Laredo. 360/ 727/ np228/ Junkyard 7427 TBI/ Msd ignition

candymancan
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Re: Love tha Jeep!!

Post by candymancan »

Well i tried an experiment.. Pump the gas pedal 6 times before starting and it starts instantly and rpms sorta drop maybe 200 from 1200 but then go back up and it doesnt die.

Could the gas like mentioned be draining back or something ? Never needs 6 pumps in 60+ weather. only 1 and done.. But if i do 1-2 in cold it does the quick idle drop and dies.

Oh well
1998 Jeep Grand Cherokee 5.9L Limited 219k
1998 Jeep Grand Cherokee 4.0 I6 laredo 430k
1990 Jeep Grand Wagoneer 155k
1976 Jeep J10.. 85k(repaired)
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