Help ?coil?

Hello & Help
:welcome2:

Hello i'm Luke,

New to both landrovers and forum stuff so please bare with me. I have finaly brought a Land Rover I went for a 1995 Discovery 3.9 V8i S! I have always been into them and after going out in my best friends (Jim Kelly A member on this site) 110 I thought i would bite the bullet.

So my first day of Land Rover ownership started good a got a gr8 deal on the car only paid £600 it has a months m.o.t but having looked all over the car its straight no rust anywhere, good brakes etc etc so i was confidant it would pass the mot.
Having drove home problem free i thought all was well, untill i took it to have the engine cleaned after there was a missfire, it carried on for about 35 milles and seemed to go so i thought it was ok. untill it died! i called the rac and the man said it was the coil as there was power going to the coil but not coming out also there was no injection pulse.
Sunday morning i brought a new coil and it still does not work! i'm not sure where to go from here whats the likly cause? somebody has told me it could be the ignition modual could that be and where is it located on my car.

Thanks for your help,

Luke

You say there's no 'injection pulse'?
Ignition and injection aren't linked on the 3.9 EFi, so if you aren't getting juice through the squirters that is one problem; if you aren't getting a spark to light it's fire, thats a completely different one..... except that they are both electrical......
I'd start by eliminating the ignition faults; pull a plug, clamp it in the jaws of a jump lead, with the other end on the neg term of the battery to enfure a good earth, HT lead on, and crank the motor, and check you get a spark.
If not, work back through the ignition.....
If you do, then turn your attension to the fuel system; after cranking are the spark plugs 'wet' and do they smell of petrol?
If not, then no juice getting through..... start with the obviouse / simple...... is there petrol in the tank? Is the fuel pump whirring away? If no fuel pump whir, then look for the inertia switch; think its under the passenger seat (is on a Rangie anyway) and check that its in the 'on' possition...... (think that's 'up')
Next, do you have an LPG system?
If so, that may be wired in any manner of ways to kill the injection system at switch-over, and a fault there could be killing the petrol management.
On the 3.9, the injectors are fired by earthing the feed to them, and a smart LPF installer can avoid using emulators simply by isolating the injector return via a relay, which may be your fault.
If no LPG, then next port of call would be to look for a dodgy earth in the engine bay, possible / likely that when you had it cleaned, dislodged crud or rust isolating an earth point or something.......
Basically..... prod & poke time, and when you have more info, we may be able to better help.

With ignition on the coil is being supplied 6.45volts. The battery is sitting at 12.4volts. I have checked for presence of HT current through the main coil lead by using a timing light as well as checking on HT for cylinder 1. Checked current running through the primary ignition coil whilst cranking and this reads zero. Replaced the coil and still the same results on test. The inertia switch has not been triggered so that's okay. Can hear fuel pump whiring away on cranking. All fuses seems to be okay. The RAC man said that the injectors are not getting a pulse but I haven't checked these yet as concentrating on the ignition first then worry about that later. I spoke to someone and they said that the ignition module turns the coil on via ground and that in turn turns on the injectors. Certainly a lot of wires, something like 4 on each post on the coil. Earth strap on the coil is good and zero ohms. See that there's a condenser between the coil +ve and that is grounded to the bracket also. Does anyone know where the ignition is? The manual says the ECU is under the drivers' but it isn't! Oh, also there's whopping resistor with a gold heat sink attached and this is on the bulkhead, I presume this is a ballast resistor?

This sounds like the old chest-nut of ballasted and non ballested coils; ballasted coil runs at 6v dropped via the ballast resistor from battery voltage. On start-up, though, resistor is isolated, letting the coil run 'hot' on battery volts, which would normally kill it, except when cranking, terminal volts drop, so coil gets something close to what it normally likes, with a small 'boost' to help the motor catch.
Now, if you have an external ballast rististor on the bulkhead, and a coil with integral resistor, (which from sounds of having so many terminals, you probably have) then the integrated ballast resistor will be doubly dropping the volts.
Without the stuff infront of me to look at, best advice I can offer is;
1/ pull a plug and look for a spark!
2/ get a wiring diagram
3/ check the markings on the coil.

" there's whopping resistor with a gold heat sink attached and this is on the bulkhead, I presume this is a ballast resistor?" Forget that that's your dim-dip resistor.

Luke you're talking out your arse, stop letting your dad post for you! There's no way you'd even know what ballast resistor means hahah

TheVengefulElephant said:

Luke you're talking out your arse, stop letting your dad post for you! There's no way you'd even know what ballast resistor means hahah

Click to expand...

thas why they invented google

reeves_luke said:

Hello & Help
:welcome2:

Hello i'm Luke,

New to both landrovers and forum stuff so please bare with me. I have finaly brought a Land Rover I went for a 1995 Discovery 3.9 V8i S! I have always been into them and after going out in my best friends (Jim Kelly A member on this site) 110 I thought i would bite the bullet.

So my first day of Land Rover ownership started good a got a gr8 deal on the car only paid £600 it has a months m.o.t but having looked all over the car its straight no rust anywhere, good brakes etc etc so i was confidant it would pass the mot.
Having drove home problem free i thought all was well, untill i took it to have the engine cleaned after there was a missfire, it carried on for about 35 milles and seemed to go so i thought it was ok. untill it died! i called the rac and the man said it was the coil as there was power going to the coil but not coming out also there was no injection pulse.
Sunday morning i brought a new coil and it still does not work! i'm not sure where to go from here whats the likly cause? somebody has told me it could be the ignition modual could that be and where is it located on my car.

Thanks for your help,

Luke

Click to expand...

Hope you keep it longer than he kept his

iannotts said:

Hope you keep it longer than he kept his

Click to expand...

Bling over diesel I seem to recall.

Teflon do you no much about 3.5 EFI engines?

I have spoke to many people now, we got it started last night by connecting the battery to the coil with a wire and it worked so sombody said it could be a problem with the Immobiliser one problem where is it?

In the dash. http://homepage.ntlworld.com/stage1v8/TechnicalSpider.htm
Also. http://forums.lr4x4.com/index.php?showtopic=86

Thanks for that both really usefull. It's so confusing because everybody has diferent ideas to what it is! i have just been cheeking everything and think i am finaly getting close i will let you know when its fixed (hopfully tonight)

Good luck!

Hello,

The car is now alive! Had it running not quite sure what was wrong as my dad helped alot but i belive it is the spider thing behind the centre of the dash, but we have gone around it. We wired a new circuit and it is all working now with yet another relay there are loads of them we had to test!

Thanks for all your help.

One more question off point, how much off roading can you do with a standerd car? (disco)

reeves_luke said:

Hello,

The car is now alive! Had it running not quite sure what was wrong as my dad helped alot but i belive it is the spider thing behind the centre of the dash, but we have gone around it. We wired a new circuit and it is all working now with yet another relay there are loads of them we had to test!

Thanks for all your help.

One more question off point, how much off roading can you do with a standerd car? (disco)

Click to expand...

Lots thats what they are designed for