Non Starting Rv8
Discussion
Ok then Chaps here's one for you.
fairly standard hotwire rv8. not been run for a month but tried to start her last night and no joy.
On first attempt it fires up and will run for about 10 seconds but will not rev up.
then is stalls and will not restart.
basically what seems to be happening is its firing and then flooding.
I've just tried again, and same thing. fires runs for about 10 secs then stalls. I pulled a plug straight away and its wet as buggery with fuel.
Any suggestion as to whats causing it.
I had a great night yesterday. two blinking tvr's and neither would start... still at least a new battery got the chim going...
fairly standard hotwire rv8. not been run for a month but tried to start her last night and no joy.
On first attempt it fires up and will run for about 10 seconds but will not rev up.
then is stalls and will not restart.
basically what seems to be happening is its firing and then flooding.
I've just tried again, and same thing. fires runs for about 10 secs then stalls. I pulled a plug straight away and its wet as buggery with fuel.
Any suggestion as to whats causing it.
I had a great night yesterday. two blinking tvr's and neither would start... still at least a new battery got the chim going...
Bit strange that it fires up for a few seconds each time, normally once it's flooded it gets harder and harder to get it to fire at all. So it may not be a simple case of a flooded engine.
Perhaps you have an ignition fault causing the spark to fail after a few seconds. Do you have anything you can use to show that you are actually getting a good spark while it's running? A passive strobe in series with one of the HT leads is my favorite.
The second possibility is that it is simply over-fuelling. Check that the vac line to the fuel pressure regulator is still connected. If it's still connected you could still have too much fuel pressure or be running richer than normal for some other reason, this would make the engine run roughly and struggle when you try to open the throttle. Depending how severe it is you may find it gets better once things start to warm up, so it may be a matter of nursing is with as little throttle as possible to keep it running for the first few minutes.
Something you can try if nothing else seems to work, is to cut the fuel supply off for a moment to lean the engine out and see if it improves. You'd need to reconnect it after a second or so otherwise it will simply die. There are several ways to cut the fuel. One is to disconnect the signal from the dizzy to the ECU - there should be a connector under the bonnet in the general vicinity of the throttle body. Or you can pull the fuel pump relay or fuse (bit awkward to get to on yours though). Or you can pull the wire off the pump, being carefull not to let it short on anything. Or you can trip the inertia cut-out. You would need to do this while the engine is running, so you need a glamorous assistant or else some wires hooked up in advance so you can disconnect and reconnect from the driver's seat.
Perhaps you have an ignition fault causing the spark to fail after a few seconds. Do you have anything you can use to show that you are actually getting a good spark while it's running? A passive strobe in series with one of the HT leads is my favorite.
The second possibility is that it is simply over-fuelling. Check that the vac line to the fuel pressure regulator is still connected. If it's still connected you could still have too much fuel pressure or be running richer than normal for some other reason, this would make the engine run roughly and struggle when you try to open the throttle. Depending how severe it is you may find it gets better once things start to warm up, so it may be a matter of nursing is with as little throttle as possible to keep it running for the first few minutes.
Something you can try if nothing else seems to work, is to cut the fuel supply off for a moment to lean the engine out and see if it improves. You'd need to reconnect it after a second or so otherwise it will simply die. There are several ways to cut the fuel. One is to disconnect the signal from the dizzy to the ECU - there should be a connector under the bonnet in the general vicinity of the throttle body. Or you can pull the fuel pump relay or fuse (bit awkward to get to on yours though). Or you can pull the wire off the pump, being carefull not to let it short on anything. Or you can trip the inertia cut-out. You would need to do this while the engine is running, so you need a glamorous assistant or else some wires hooked up in advance so you can disconnect and reconnect from the driver's seat.
greenv8s said:
Bit strange that it fires up for a few seconds each time, normally once it's flooded it gets harder and harder to get it to fire at all. So it may not be a simple case of a flooded engine.
It only starts after i've left it long enough for the fuel to evaporate. not straight away.
I've tried the usual pull the fuel pump relay ( easy to get to in the tuscan
) It does look like over fueling
I'v just tried it again ( in between fitting a new bumper to wifies ex-discovery and a new batt to the chimaera !!!) and same thing.
fired with a bang burning unburnt fuel, ran for about 10 secs. I then pulled a plug straight away with out trying to restart and its wet.
the coolant sensor is the normal culprit for an efi problem I'll check reading tomorrow ( mental note to make up a couple of resistor packs of known resistance for testing )
Other suggestions have been a weak spark or a jammed injector
cheers
G
Mines off the road as well with this problem.
Droved the car 22 miles to work,with no problems on Wednesday.
Got in the car to go home, started fine, after about a mile in just cut off suddenly.
Tried starting it,no good.
Let the car sit for 10mins, turned the ignition firing up, but strugging to actually start.
Started up but would run for about 20 seconds then cut off.
Called the AA, the checked the relay(pump and injector fuses).
Basically they said some thing is keeping the fuel injectors constanting pumping fuel into the engine, which is causing the car to flood with petrol.
It's in the garage at the moment, so I hope the find the problem.
The symtoms of mine is a constant ticking/clicking sound coming from the injections when the ignition is in prime mode.
>> Edited by pena on Sunday 29th January 16:09
>> Edited by pena on Sunday 29th January 16:10
Droved the car 22 miles to work,with no problems on Wednesday.
Got in the car to go home, started fine, after about a mile in just cut off suddenly.
Tried starting it,no good.
Let the car sit for 10mins, turned the ignition firing up, but strugging to actually start.
Started up but would run for about 20 seconds then cut off.
Called the AA, the checked the relay(pump and injector fuses).
Basically they said some thing is keeping the fuel injectors constanting pumping fuel into the engine, which is causing the car to flood with petrol.
It's in the garage at the moment, so I hope the find the problem.
The symtoms of mine is a constant ticking/clicking sound coming from the injections when the ignition is in prime mode.
>> Edited by pena on Sunday 29th January 16:09
>> Edited by pena on Sunday 29th January 16:10
If that diagnosis is correct then you're almost certainly looking at an ECU fault. But I'd want to run further tests to prove the injectors were actually staying open, before I believed that. The ECUs are generally very reliable, and there are plenty of other fuel and ignition faults that could account for the symptoms you're getting.
MMM i kind of hoping its a coil or jammed injector on mine... or yet another fuel regulator..( i do need to get the pressure sensor on the stack working propery)
I'll try the spare ecu tommorow, I couldnt get the enthuisiasim to play with it today, SO spent it tidying up the wifies v8 Discovery before I sell it
as she's replaced it with a freelander 
Its looking like we'll be down to only 2 v8's in the family soon
>> Edited by Graham on Sunday 29th January 19:14
I'll try the spare ecu tommorow, I couldnt get the enthuisiasim to play with it today, SO spent it tidying up the wifies v8 Discovery before I sell it
as she's replaced it with a freelander Its looking like we'll be down to only 2 v8's in the family soon >> Edited by Graham on Sunday 29th January 19:14
was assuming that you had a spark there. if its not firing strongly it will flood very quicky as i'm sure that yours will have lots of fuel pumping through.
guess you'll have to establish whether it can't continue firing due to too much fuel, or if the spark can't burn that much fuel on a cold start.
could have an air blockage...collapsed inlet pipe or blocked filter
guess you'll have to establish whether it can't continue firing due to too much fuel, or if the spark can't burn that much fuel on a cold start.
could have an air blockage...collapsed inlet pipe or blocked filter
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