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Unread 08-14-2013, 10:09 AM   #1
loodi
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Join Date: Jul 2013
Location: labinci, kastelir
Posts: 49
weird 5.2 problem

happened 4 times since yesterday. driving 40-50mph in a straight line on LPG, suddenly a very short, half a second stuttering occurs, gas needle drops to min and nothing else happens. i try to switch from lpg to gasoline back and forth a few times, it just runs normally on both. no changes at all.
so nothing bad except this weird short hiccup and the needle drops down to 0.

all 4 times it was like this for about 5mins drive and then it just gradually starts to rise again.

any ideas?

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Unread 08-14-2013, 10:12 AM   #2
zj97ltd
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1993 ZJ 
 
Join Date: Apr 2013
Location: Cape Coral, FLORIDA
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You're running on LP? That's awesome. No idea though, sorry.
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Unread 08-14-2013, 10:49 AM   #3
HighLonesome
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1995 ZJ 
 
Join Date: Feb 2005
Location: New Mexico
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Electrical for sure.

Fuel pump ground or 12v? That would explain the stutter and the gauge dropping.

Verify the fuel pump and ASD relays.
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Unread 08-14-2013, 10:51 AM   #4
loodi
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Asd?
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Unread 08-14-2013, 12:04 PM   #5
sebian
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1995 ZJ 
 
Join Date: Sep 2009
Location: Austin, TX
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I am not read up on the LPG conversions, but I thought the LPG and Petrol had different tanks, which would require separate pumps?

As Highlonesome said, it probably is a bad ground somewhere. Do they share a common ground, or power source?

Edit: ASD is the auto shut-down relay. When it goes out, Jeep doesn't start.
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1995 ZJ 5.2L V8 318. 220,000 miles and still rollin.

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