Hi guys, I could do with a fresh pair of eyes as this one has got me stumped.
RR is a 1993 LSE with 4.2 engine petrol/LPG. I have owned this for about 5 years now and changed/renewed so many things during this time during its rolling restoration. Normally runs great.
The symptoms:
Car starts fine every day from cold, sounds beautiful and quickly settles down to a nice tickover. Off down the road, no issues, no spluttering, no stalling at stops
or junctions --until after about 5 to 10 minutes when the engine has warmed up properly and the temperature guage is in the middle (as it always has been), the engine will just die. It is instant just like I have turned the key off.
I slip it into neutral (autobox) whilst coasting to the side of the road and try restarting. The engine cranks and spins over but not a hint of a restart. Tried it in Park and Neutral in case there was any problem with either but to no avail, it will crank and crank but not start. The engine is not overheated, it never has been, when I refer to it as hot it is normal operating temperature.
The same will happen if I start it from cold and just leave it idling on the driveway, once it warms up it will just stop. Cranking it over and it will not go.
I leave it for an hour or two, turn the key and it fires up as if there has not been a problem, just like it does every morning.
The reason it will not fire, is that there is no spark ( maybe other things, but that is the most obvious and first that should be adressed). Something is kicking in when it gets to a certain temperature and knocking out the spark and that situation remains until it cools.
I dont believe it is fuel related as the same thing happens whether it is on petrol or gas (Prinz VSI). If one fails or runs out it automatically switches to the other. I also completely disconnected the gas and ran it for a week just so I could eliminate that side. Plugged in Roverguage, no fault codes shown, switched the fuel pump on and off manually and you can hear it running - but these points are all irrelevant (or are they?) if there is no spark.
I have just fitted a new ignition amplifier module relocation kit (now mounted by the coil on the wing) as that is a known problem with the originals on the side of the distributor getting too hot and failing. That didn't solve anything. I have changed the coil checked and double checked all the connections and terminals and they all seem good. There is 12v to the coil with the ignition on but nothing coming out of the king lead when cranking. I have an in-line tester that shows any current going through it.
I am missing something very simple here I am sure, but it is driving me nuts - any suggestions would be very much appreciated.
RR is a 1993 LSE with 4.2 engine petrol/LPG. I have owned this for about 5 years now and changed/renewed so many things during this time during its rolling restoration. Normally runs great.
The symptoms:
Car starts fine every day from cold, sounds beautiful and quickly settles down to a nice tickover. Off down the road, no issues, no spluttering, no stalling at stops
or junctions --until after about 5 to 10 minutes when the engine has warmed up properly and the temperature guage is in the middle (as it always has been), the engine will just die. It is instant just like I have turned the key off.
I slip it into neutral (autobox) whilst coasting to the side of the road and try restarting. The engine cranks and spins over but not a hint of a restart. Tried it in Park and Neutral in case there was any problem with either but to no avail, it will crank and crank but not start. The engine is not overheated, it never has been, when I refer to it as hot it is normal operating temperature.
The same will happen if I start it from cold and just leave it idling on the driveway, once it warms up it will just stop. Cranking it over and it will not go.
I leave it for an hour or two, turn the key and it fires up as if there has not been a problem, just like it does every morning.
The reason it will not fire, is that there is no spark ( maybe other things, but that is the most obvious and first that should be adressed). Something is kicking in when it gets to a certain temperature and knocking out the spark and that situation remains until it cools.
I dont believe it is fuel related as the same thing happens whether it is on petrol or gas (Prinz VSI). If one fails or runs out it automatically switches to the other. I also completely disconnected the gas and ran it for a week just so I could eliminate that side. Plugged in Roverguage, no fault codes shown, switched the fuel pump on and off manually and you can hear it running - but these points are all irrelevant (or are they?) if there is no spark.
I have just fitted a new ignition amplifier module relocation kit (now mounted by the coil on the wing) as that is a known problem with the originals on the side of the distributor getting too hot and failing. That didn't solve anything. I have changed the coil checked and double checked all the connections and terminals and they all seem good. There is 12v to the coil with the ignition on but nothing coming out of the king lead when cranking. I have an in-line tester that shows any current going through it.
I am missing something very simple here I am sure, but it is driving me nuts - any suggestions would be very much appreciated.