Vehicle & Technical > Range Rover
Hunting Engine
Dave Rogers:
I've got an RRC 3.5 efi, converted to LPG on which it runs great, economy isn't great but the performance is good, well, it goes where I want it to!
However, when it runs on petrol at idle, the engine hunts, tho when I went out yesterday laning, it didn't hunt on petrol, until toward the end of the day so I switched back to gas, I'd used petrol just to give the injectors some exercise as it usually runs on gas. When it's hunting the exhaust give out a dark hued smoke like it's a diesol!
On gas the exhaust is clear of smoke. The gas system is the single point type.
It ticks over at just under 100rpm on gas, but very slow on petrol, 500 rpm or less which rises or falls, if I change the idle speed on the plenum chamber it doesn't tick over on gas.
Any ideas??
Range Rover Blues:
How does the LPG system dissable the petrol EFi? it's possible something likje an injector has worn whilst running dry.
Anyway, it sounds like it's running way too rich.
Guardian.:
MINE IS SET UP TO RUN ON GAS, ITS A 3.9 BLOCK, BUT WITH MY OLD CARBS, THIS RUNS MINT ON GA BUT IDLES VERY SLOW AND CAN PINK A BIT ON PETROL, YOU CAN NOT HAVE IT RUNNING PERFECT ON BOTH, UNLESS YOU BUY ONE OF THOSE ELECTRONIC BOXES TO CHANGE THE SETTINGS WHEN YOU SWITCH BETWEEN FUEL.
IM GUESSIUNG YOURS IS THE SAME, SET TO RUN 100% ON GAS.
Dave Rogers:
The switch over happens via a dual changover switch, the original iwema system gave up the ghost so I make a new one, electronics being my job, it's done in this format, starts on petrol, then on changover, the fuel pump switches off, then using a capacitor to delay the gas relay until the petrol has had time to go so to speak, the gas valve is opened and the engine runs on gas, The rest of the electronics are not touched. The cold start works as it should tho sometimes there is a strong smell of petrol but not always, the engine hunts when smelling of petrol or otherwise.
Range Rover Blues:
I might suspect injector problems then as I'm told they don't like to run dry. It's more common to shut off the injectors and leave the pump running. Another benefit of this is that the fule is always circulating so you don't get a pipe full of hot fuel near the engine, oh and it keeps the fuel filter busy.
Aparently one of the few exceptions is Jeep, who only put a fuel feed intot he tank not a return? the pump doesn't like to run when the fuel isn't moving. So I'm told anyway.
Navigation
[0] Message Index
[#] Next page
Go to full version