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Old 02-06-2012, 10:13 AM   #1
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Fuel Issues

I have a UK based 97 Sahara that is dual fuel (Petrol & LPG).

On petrol the idle is up and down, the engine surges and kangaroos like crazy when you attempt to drive. Once the LPG comes online (ie after revving the engine to over 1600rpm) it evens out and runs fine.

My local mechanic has run the live data and due to the ammended lambda signal generated by the LPG control system the fault code for faulty sensor comes up. Having had the lambda sensor exchanged previously and recently I'm wary of just changing it again.

I've had the suggestion made that the issue may be due to silt in the tank as it only occurred after running the tank nearly dry also the running of the fuel pump has been questioned (it's an in tank one).

Has anyone any ideas of how I can either isolate the cause of this problem. I intend to drop the fuel tank once the weather here improves, but would really appreciate some advice/feedback from someone who's had (and hopefully resolved) similar problems.

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Old 02-07-2012, 06:11 AM   #2
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Further to this, the problem appeared to begin when the engine bay was treated to a steam clean coutesy of a spraying with water from the hose that provides water cooling to the LPG reducer.
The distributor and coil unit were in the direct line of fire, but both have been thoroughly dried out and appear to be OK. I would have expected the fault to affect LPG running as well as petrol running if the fault was electrical.
I know my description is a bit vague, but I've been running over this in my head since it first occurred and have, as a consequence, got a bit fuzzy headed with it.

Any ideas guys?

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Old 02-14-2012, 09:36 AM   #3
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Surely someone on the forum has had or seen something similar?
Is it worth cleaning the Idle valve, or should I concentrate in eliminating tank silt and a choked fuel pump?
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Old 02-14-2012, 02:03 PM   #4
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I did not know they made LPG Jeeps!
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Old 02-15-2012, 04:54 AM   #5
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The LPG setup is an aftermarket conversion. The issue that I have isn't with running on LPG, it's with running on regular petrol.
I can isolate the LPG so that it has no effect on the normal running. When I do so, the idle lopes (rythmically surges) and the vehicle kangaroos under load making it virtually undrivable.
Once switched to LPG the running evens out and I have constant pull.
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