Having problems with your Pontiac Montana SV6 ?

LPG probs hello, i have a 2003 vy holden commodore v6 (GM) motor duel fuel, petrol /gas,while driving along the free way at 110klm speed between 40klm and 50lkm the lpg shuts down just like i've turned it off an then i have 2 switch it 2 petrol 2 keep going, the radiator is full the lpg gas lines are warm 2 hot ,no sign of freezing . after the car has stopped 4 about 1/2 an hour the car will run in idle but won't rev after an hour it will go again ,  most of the time i don't have any probs aroun

Posted / edited by AnonymousUser on : 17-12-2018

Answers :

How close to the exhaust is the supply line as the lpg supply line should be cold until it gets into the regulator not warm.Is the supply line heat shielded as it enters the engine bay or getting a full dose of exhaust heat?Is it the vapor injection gas system or the old style.What regulator and system are you using?OMVL ?sprint gas or other cheaper variants?It really sounds like a fuel delivery issue as you are not getting the volume of gas required at higher speeds.Commodore engines have issues with thier water system having air bubbles that cause air locks in the regulators by the time youve jumped out of the car to check for freezing it appears to be fine.You may have restrictions in the lpgas filters/locks.The water hoses,2,should be hot so hot you cannot leave your hand on them and if not freezing of the reg once again becomes the issue.Also the water hoses must be fitted in such a way that the top hose is suction and the bottom hose forces water into the reg,this is done to assist in eliminating potential air lock problems.To sum up your symptoms are consistant with poor water ciculation.
Repair Help & Product Troubleshooting for Pontiac Montana SV6

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