300C stalling on changeover

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Yank Boy
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300C stalling on changeover

#1 Post by Yank Boy » Mon Dec 28, 2015 9:58 pm

Hi All

I have a 5.7 Chrysler 300C running a Prins system it's been faultless over the last 70000 miles on LPG but has now started to stall and cut out at the point of turning on to gas in the morning.
If it's just ticking over it will cut out and stall, if it's driving it beeps and switches back to petrol. It only does it for the first start of the morning and switches fine throughout the rest of the day.
I have tried turning up the temp at which it switches to gas but it has made no difference.
Any ideas?

classicswede
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Re: 300C stalling on changeover

#2 Post by classicswede » Mon Dec 28, 2015 10:54 pm

Clean the LPG solenoid plunger
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Yank Boy
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Re: 300C stalling on changeover

#3 Post by Yank Boy » Tue Dec 29, 2015 8:16 pm

Is that something I can do myself or not?

classicswede
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Re: 300C stalling on changeover

#4 Post by classicswede » Tue Dec 29, 2015 8:37 pm

Yes you can, close manual valve on teh tank. Run the engine on LPG at idle untill it switches back or stalls. Tank off the front solenoid coil. Undo the pluger post and clean the inside and the punger. Put back together and open manual tank valve
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Yank Boy
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Re: 300C stalling on changeover

#5 Post by Yank Boy » Tue Dec 29, 2015 9:12 pm

I have twin tanks one in the wheel well and another across the back seat so I assume I'd need to isolate both.
It's a pain to get to the tank in the wheel well as its under a false trunk floor can I just run the car until it's out of gas or would that not purge it enough.
I guess the solonide will be under the hood somewhere near the vapouriser.

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Re: 300C stalling on changeover

#6 Post by LPGC » Wed Dec 30, 2015 5:31 pm

As Dai says, then to answer your further questions...

Would really be a good idea to isolate both tanks, as you don't know for sure the solenoid valve on each tank is working properly. If one or both was stuck open then when you come to take apart the front solenoid all the gas in tank(s) with problem solenoid could escape.

Isolating tank(s) and running until system switches back to petrol means gas in the lines between tank(s) and front solenoid will be used, so when you come to dismantle front solenoid there won't be as much gas escaping. If you dismantle front solenoid with liquid gas in the lines then it's possible you could damage rubber seals on solenoid because the gas escaping will make them cold and brittle.

If you want to take the risk, you might feel more assured if you can at least hear the solenoids on both tanks work when you switch to LPG... If you can hear them click chances are they're working (so you wont lose all gas in tanks).

Correct on likely solenoid location.

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