95 disco 3.9 v8 lpg no start

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lrdisco93

New Member
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31
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redcar and cleveland
Hi guys, so here goes with my problem. Yesterday I took my disco only 2 miles from my home and just about to park up it just died, at the time it was running on lpg and I thought ill just turn it to petrol to start up and nothing, head scratching moment now. So jiggled leads to coil and dizzy and still nothing. SO I WAS EMBARASSED TO SAY I GOT TOWED HOME!

So today I started getting go work on it, I have a brand new electric dizzy and high performance coil ordered from simonbbc.co.uk and fitted them to regain the spark as I had lost it totally yesterday. So again regained the spark, realised that the timing was 180* out, so did that and still nothing. The lpg is off at this point. So checking the spark plug theres no fuel getting to it which makes me think the injector firing is wrong or not responding.
The lpg system is a single point Bedini setup but if im honest looks a proper bodge job. Wires all over the place :confused: so after looking about on many forums it was saying all sorts like lpg at fault etc etc. Anyways ive checked all fuses and the fuel pump in the tank, its priming when the ignition is turned on. Theres fuel in the rail as I checked the rail test valve.

Im just so frustrated with it afger spending time and money on doing boot floor and off road mods it just decides to give up and give me no idea what it could be, ANY HELP WOULD BE GREAT PLEASE !
 
lrdisco93 said:
Hi guys, so here goes with my problem. Yesterday I took my disco only 2 miles from my home and just about to park up it just died, at the time it was running on lpg and I thought ill just turn it to petrol to start up and nothing, head scratching moment now. So jiggled leads to coil and dizzy and still nothing. SO I WAS EMBARASSED TO SAY I GOT TOWED HOME!

So today I started getting go work on it, I have a brand new electric dizzy and high performance coil ordered from simonbbc.co.uk and fitted them to regain the spark as I had lost it totally yesterday. So again regained the spark, realised that the timing was 180* out, so did that and still nothing. The lpg is off at this point. So checking the spark plug theres no fuel getting to it which makes me think the injector firing is wrong or not responding.
The lpg system is a single point Bedini setup but if im honest looks a proper bodge job. Wires all over the place :confused: so after looking about on many forums it was saying all sorts like lpg at fault etc etc. Anyways ive checked all fuses and the fuel pump in the tank, its priming when the ignition is turned on. Theres fuel in the rail as I checked the rail test valve.

Im just so frustrated with it afger spending time and money on doing boot floor and off road mods it just decides to give up and give me no idea what it could be, ANY HELP WOULD BE GREAT PLEASE !
Click to expand...

pm dr evil he is the sites master on v8's
 
He will smell your fear....

But until he comes along, go back to basics. Put your car in the exact position it was in just when it died. You only need 3 things to make her run fuel, a spark at the right time and air. get them and she WILL run.

You mentioned that the tiing was 180* out. Did you remove the distributor at any point? if not the timing cannot be out by 180*. Try running her on gas. What happens?

Also be more specific about what happened when she died - was she actually running on gas then, as she switched to petrol she died? if so it's likely a fuel pump or emulator issue. The good thing about dual fuel is it's pretty easy to quickly narrow the problem down to fuel or ignition....
 
sidewaysste said:
He will smell your fear....

But until he comes along, go back to basics. Put your car in the exact position it was in just when it died. You only need 3 things to make her run fuel, a spark at the right time and air. get them and she WILL run.

You mentioned that the tiing was 180* out. Did you remove the distributor at any point? if not the timing cannot be out by 180*. Try running her on gas. What happens?

Also be more specific about what happened when she died - was she actually running on gas then, as she switched to petrol she died? if so it's likely a fuel pump or emulator issue. The good thing about dual fuel is it's pretty easy to quickly narrow the problem down to fuel or ignition....
Click to expand...


Hi thanks for the reply yes I removed the old dizzy completely to eliminate that and refitted a brand new one. But now I've had a much more experienced mechanic make sure I've got it right now.
Yes it was running on gas when it died, so then I changed the switch back over to petrol and nothing. The pump is running spot on, primes when I turn ignition on, pressure in the rails. I was thinking the lpg ecu may still think it's running lpg and won't allow the petrol to turn back on.
Just the whole lpg setup looks all over the place, I mean the stepper motor (not sure what it is exactly but found out of the Internet what it was) is not connected to anything it's just sat under the intake manifold. REALLY CONFUSED.
 
The Stepper motor just controls gas flow at larger throttle openings, don't worry about it for now.

Do you have a spark? If so can you attack a timing light to #1 lead and find out when it's sparking?

If it is sparking well and at the right time then you need to look at fuel. Unplug the interruptor cables from the back of the injectors and plug the standard leads back onto the injectors, see what happens then.

Remove a spark plug, does it look wet?
 
If I attach a timing strobe I will only be able to crank it over, will that be enough to get a good timing indication ?
May sound dumb now but not sure what the interrupter cable is and I don't see any other cables to plug back into the injectors. Just one plug on the injectors and no the plug isn't wet when I remove it after turning it over.
 
Should be. If not check that the rotor arm approximately lines up with #1 plug lead at tdc on compression.

The gas system willneed to interrupt the signal to the injectors so that it can cut petrol when running on gas and also convince the ECU that it is still running on petrol when it's on gas. Usually there are small cables with 2 plugs that you plug one end into the stock injection loom and the other onto the fuel injector. Either that or someone's cut and soldered the wires.... take some pics if you can
 
So I've now disconnected the lpg system from the wiring loom and for some reason I've lost the use of my fuel pump relay for some reason :-S trying to back step thinking what was on the fuel pump relay to do with the lpg and I'm lost again. Can anyone give a good diagram or colour code wires to and from the relay, and also where they should be going.
Cheers yawl
 
Ok so now I have the fuel pump relay back working under the bonnet but still have the issue of the injectors not injecting. I've an idea it has something to do with the coil and the wires that are going to it. Will investigate further tomorrow.

Help is still needed guys
 
I can't see how the coil would be connected to the injectors. What was causing the FP to not work?

If you're getting pressure but no injection, are you getting a 12v feed to the injectors?
 
Yes there's power to injectors. Is there by any chance that the injectors could be nackered and will not work as of that. I think we've sussed that the injectors were still firing but no fuel once the lpg was running. That's the only thing we can think of. If this is the case I did a test on the ecu plug between 2 and 11 there was nothing and 2 and 13 there was 18ohms. Doesn't sound right to me
 
Its unlikely that all 8 have failed. Check continuity back to the ecu and if thats good check the trigger pickup on the distributor.
 
That doesn't sound right - there should only be a relay under the driver's footwell panel. There is a load control relay somewhere but you know that's working if you've got 12v to the injectors on the brown/orange wire
 
hi guys and thanks for the replies, this morning i myself got it going, the timing was 1 tooth out and it was that causing it. also i disconnected the 3rd fuel relay that was connected for the lpg, boom straight up on the key.

any ways timing was slightly out and needed my pal to bring me his timing strobe, it was still way out so i turned the dizzy body and its now bang on. in the mean time i had burnt out my starter motor and flattened two batteries, oops but I'm going to buy a new red top optima battery.

but thanks again for everyones help and im really grateful, now just to fit the winch bumper, winch, new plasma rope, finish my rock/tree sliders and install. all the good stuff now :D
 
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