Question about 1985 Chevrolet Sportvan G30

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1985 5.7L Chevy G30 engine problem

My G30 based Winnebago has an LPG conversion. It runs fine on LPG but on gas (petrol) the engine runs on for a few seconds after switching off followed by a loud explosion in the exhaust system. It also ticks over erratically - usually too fast.

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  • grahamnewton May 13, 2009

    Thanks - I'll try running it just on gas. I normally run the propane to empty and then switch over on the move and drive on gas until the next propane station. I assumed that the installation prevents mixing of the fuels. Would the carb drying up cause the high tickover, that is the throttle not returning properly?

    Thanks again for help. Graham.

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Have the same sort of conversion on the same g30 warrior need to alter the timeing slightly this cured it on mine can only get it somewhere near as timeing is diff for the 2 types of fuel

Posted on Oct 28, 2012

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Do you shut the propane off before turning on the gas ? try turning the propane off and start the MH on gas .. The mixture of the two is whats causing the problem .. Also you need to run it on gas frequently to keep the carb wet so it wont dry up .. it might be already dried up if you run it on propane alot . might be needin a kit in it.. thanks and holler if you need more Jerry

Posted on May 13, 2009

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