2003 S80 bi-fuel won’t switch to LPG
recently bought a 2003 s80 bi-fuel ( wife won’t let me drive the 2.5T anymore) anyway got it for a steel as the LPG system didn’t work , as I said to the wife “how hard can I be ?” Well :
1. Changed the vapourisor elbow and solenoid 2. fitted a new filter 3. Checked fuses 4. Stripped down the distributor , cleaned thoroughly and found a small piece of (possibly O ring ) stuck in the side of the stepper motor , gave it a little push and it popped out , I now know this was not a good think to do . 5. Found a faulty injector and replaced for new . 6. Checked the plugs ( they’re the multi point type ) going to change for bog standard NGK 7. Got plenty of heat circulating around the regulator. 8. Got a click sound from the boot area when operating the switch but not from the solenoid under the bonnet . 9. Tank is 3/4 full and as metioned there’s gas to the dizzy 10 . Screemed “why won’t you work” at it ! I’ve read all the posts a learnt plenty from the guys on here , I’d be happy right now if it just ran a little , even if it was rough , cut out after 10 miles , misfired , backfired or just broke wind ! Autogas 2000 have been great so far and I’d recommend them highly. Is there anyone out there with any help , advise or similar experience to mine please ? |
If the vapouriser solenoid is not clicking then have you cleaned inside it?
If clean inside then try a new coil on it https://www.classicswede.co.uk/Bifue..._10879079.aspx |
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Looks like your might be best replacing teh front end for a propper system
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Have you checked the solenoid operation by applying 12v from an external supply to see if it switches?
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When mine was faulty, it would switch over to gas briefly before the engine died of fuel starvation, so the theory seems sound. |
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1. Faulty switch ( but if fires the rear solenoid ok ) 2. It needs to be up to temperature ( faulty temp gauge ) 3. Faulty ECU maybe ! 4. Faulty relay ( learn how to check that ) 5. Faulty stepper ( not fitted right now, away being tested ) I think that’s my list complete, these are just my workings out, I appreciate guys get cheesed off with folk cribbing rather than working it out for themselves on here but having looked through the forum I’ve seen plenty of rough running and also fail after running issues but not a won’t switch over at all problems as such , could be as classic swede said “new front end “ Just need to be sure I’m not throwing the baby out with the bath water first . |
If I remember rightly (and I often don't). The car will wait for the coolant temperature to reach a certain value before switching to LPG, mine used to switch within a mile - the obvious place to switch is the front (or both) solenoid/s. Can't remember where the sensor is though, some necam vaporisers have one in the body, but I think it's deleted in the Volvo installation. You need to check.
Won't be the stepper or distributer as that's after the solenoid. |
Yes I’ve been told the temperature sensor on the vaporiser is not used (although fitted to the casing ) I can only surmise at this point it gets a signal from the temp gauge on the head or via the ECU (a wiring diagram would be handy) my local Volvo dealership were reluctant to pass that on to me “oddly” .
I’m working away at the moment so I’ll have another bash on my return , thanks so much for the continuing help I really appreciate it. |
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