weird 5.2 problem -
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post #1 of 5 Old 08-14-2013, 11:09 AM Thread Starter
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Join Date: Jul 2013
Location: labinci
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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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post #2 of 5 Old 08-14-2013, 11:12 AM
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1993 ZJ 
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You're running on LP? That's awesome. No idea though, sorry.
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post #3 of 5 Old 08-14-2013, 11:49 AM
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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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post #4 of 5 Old 08-14-2013, 11:51 AM Thread Starter
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post #5 of 5 Old 08-14-2013, 01:04 PM
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1995 ZJ 
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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.

1995 ZJ 5.2L V8 318. 230,000 miles and still rollin.

List of parts not replaced yet:
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