v8pop. Posted November 29, 2009 Share Posted November 29, 2009 Hi guys, does anybody know a problem with a 1994 3.9 V8 Discoverys? It cuts out whilst driving, you can be anywhere from a junction to going down the motorway, sometimes an orange light with an exclamation mark (!) comes on and sometimes it dont. It can do anything from stopping dead to loss of power. I have the dash out but have since been told it does not have a spider as it is a one button key fob. Has anyone got any ideas? - Cheers Quote Link to comment Share on other sites More sharing options...
andy12720 Posted November 29, 2009 Share Posted November 29, 2009 could possibly be the ignition module usually bolted to the back of the coil. having the same problem with mine but not got round to replacing it yet. is it worse with a warm engine or more intermittant. Quote Link to comment Share on other sites More sharing options...
mobyone Posted November 29, 2009 Share Posted November 29, 2009 ignition amplifier on dizzy, rotor arm in cap. pants leads/cap. weak coil. the exclamation means you need to stop soonest. if it runs, but keeps cutting out, is it when it is warm or cold? could be a head gasket. is the oil/oil pressure/water level ok. are you overheating it, maybe water pump in which case maybe a head gasket too. is your alternator charging correctly? if not, then that could be causing it. idle control valve. there are loads of things it can be. i had a 3.5 rrc, went well till one day was trout. my cam was worn out so rip one rrc. but yours runs, so probably one of the above (not cam) and or a bad earth. been a while since i had a v8 rover, will be more grown ups to help more soon... richard Quote Link to comment Share on other sites More sharing options...
Hybrid_From_Hell Posted November 29, 2009 Share Posted November 29, 2009 Sorry But need a load more info than whats been given When was it last serviced, by whom, what was changed Has it got genuine leads cap rotor arm coil etc if so good - how old, if not what are they and how old What happens AFTER it plays up, does it go away or stay, when exactly does it do it, what are the symptoms how does it behave, is it a misfire or just down on power, anything been done to the engine in last 6 months, if so what, what the history of the car, when did it 1st start doing this, was anything touched just before this happened ? Without chapter and verse and some simple fundemental basics its basically guessing Post up verbatum there are a number here who know their V8s Nige Quote Link to comment Share on other sites More sharing options...
Bull Bar Cowboy Posted November 29, 2009 Share Posted November 29, 2009 Yes agreed ………… sounds like ignition amp which is a known failure, but more info is required………… Quote Link to comment Share on other sites More sharing options...
vougese39 Posted November 29, 2009 Share Posted November 29, 2009 has the ecu been read, also the as said more info could be also the speed transducer failed Quote Link to comment Share on other sites More sharing options...
Hybrid_From_Hell Posted November 29, 2009 Share Posted November 29, 2009 has the ecu been read, also the as said more info could be also the speed transducer failed Faulty RST will normally just make the engine 'stall' as you come to a halt at lights etc It rarely causes a total loss of engine or misfire as its a secondary input Nige Quote Link to comment Share on other sites More sharing options...
vougese39 Posted November 30, 2009 Share Posted November 30, 2009 Faulty RST will normally just make the engine 'stall' as you come to a halt at lights etc It rarely causes a total loss of engine or misfire as its a secondary input Nige as the chap has stated he is not getting a missfire! the reason for this i had one fail and spike the ecu only when driving and it opened the stepper and caused it to stall and over rev but as the guy has not said when it is happening either on accerleration or over run we will have to wait for more info Quote Link to comment Share on other sites More sharing options...
v8pop. Posted November 30, 2009 Author Share Posted November 30, 2009 Hi guys, does anybody know a problem with a 1994 3.9 V8 Discoverys? It cuts out whilst driving, you can be anywhere from a junction to going down the motorway, sometimes an orange light with an exclamation mark (!) comes on and sometimes it dont. It can do anything from stopping dead to loss of power. I have the dash out but have since been told it does not have a spider as it is a one button key fob. Has anyone got any ideas? - Cheers the landie was laid up for a few months due to the wife breaking her hip and not being able to drive [she uses it most days] when we got it out of the garage i noticed batteries needed replacing on fob; this done car was fine then we noticed we had to get closer to car to beable to disarm it this got to the point where you had to touch bonnet with fob for it to work.then the problem started with the cutting out.you get no warning of when it is going to happen you can be crusing at steady speed and it will decided to stop dead or lose power and then just as quick pick up. this can happen daily or every few days .gaskets changrd last year so can,t be that plugs are fine checked all the possible causes now stumped and can,t use landie as stopping dead causes a few nightmares once again any hlep welcome thanks Quote Link to comment Share on other sites More sharing options...
v8pop. Posted December 20, 2009 Author Share Posted December 20, 2009 Hi guys back again , just finished putting s/h alarm ecu in and ( ignition barrel and wiring harness ) ok for about a week and back comes the cutting out and flashing light and now its snowing Help. Quote Link to comment Share on other sites More sharing options...
calvin Posted January 6, 2010 Share Posted January 6, 2010 Faulty RST will normally just make the engine 'stall' as you come to a halt at lights etc This sounds like my V8efi 3.9 auto but excuse my ignorance but what is an RST? cheers Quote Link to comment Share on other sites More sharing options...
Hybrid_From_Hell Posted January 6, 2010 Share Posted January 6, 2010 Sorry RST = Road Speed Transducer Nige Quote Link to comment Share on other sites More sharing options...
Bull Bar Cowboy Posted January 6, 2010 Share Posted January 6, 2010 the landie was laid up for a few months due to the wife breaking her hip and not being able to drive [she uses it most days] when we got it out of the garage i noticed batteries needed replacing on fob; this done car was fine then we noticed we had to get closer to car to beable to disarm it this got to the point where you had to touch bonnet with fob for it to work.then the problem started with the cutting out.you get no warning of when it is going to happen you can be crusing at steady speed and it will decided to stop dead or lose power and then just as quick pick up. this can happen daily or every few days .gaskets changrd last year so can,t be that plugs are fine checked all the possible causes now stumped and can,t use landie as stopping dead causes a few nightmares once again any hlep welcome thanks Are you saying that you have changed the alarm spider ? ..........personally I wouldnt trust a S/H unit............ these are a known problem for 'cutting out' and the best plan is to bypass it. There is a load of stuff in the technical archive............. Here is the link to the alaram spider problems http://forums.lr4x4.com/index.php?showtopic=86 Quote Link to comment Share on other sites More sharing options...
calvin Posted January 6, 2010 Share Posted January 6, 2010 RST = Road Speed Transducer Thanks - of course it is. It is obvious. cheers Quote Link to comment Share on other sites More sharing options...
calvin Posted January 7, 2010 Share Posted January 7, 2010 Would a duff RST cause the engine to idle too fast intermitently. The latest thing is the engine will start but sometimes after the first few seconds of high revs which is normal it wont settle back down to the proper idle speed but will stay upward of 1500, even when driving. (making engaging drive or driving on snowy, icy roads interesting!!) If not any ideas? cheers Quote Link to comment Share on other sites More sharing options...
vougese39 Posted January 8, 2010 Share Posted January 8, 2010 sounds like a dirsty/sticking stepper motor i would remove and clean and reset the base idle Quote Link to comment Share on other sites More sharing options...
Wynne davies Posted February 1, 2021 Share Posted February 1, 2021 Hi I have same problem with my disco 1 3.9 v8i manual it will stall after a few minutes from starting doesn't matter if it is hot or cold and won't restart just turn over with out firing disconnect the battery for a few mins and will start five times out of ten will run allday then with no issues or will play up cutting out frustrating and dangerous if on the motorway and cuts out any ideas gents no engine check light and no codes in the ecu Quote Link to comment Share on other sites More sharing options...
teabag Posted February 2, 2021 Share Posted February 2, 2021 (edited) 10 hours ago, Wynne davies said: Hi I have same problem with my disco 1 3.9 v8i manual it will stall after a few minutes from starting doesn't matter if it is hot or cold and won't restart just turn over with out firing disconnect the battery for a few mins and will start five times out of ten will run allday then with no issues or will play up cutting out frustrating and dangerous if on the motorway and cuts out any ideas gents no engine check light and no codes in the ecu Not all 3.9s have one but that’s a symptom of an iffy ‘spider’ immobilise. I put up with it for six months, even wouldn’t start when disembarking from a cross channel ferry, the a few minutes it started and was ok for the rest the day, until later another day the engine cut out in the third lane at 70ish. Time to fix, one of the spiders functions is to cut the 12v supply to the coil, so I installed a single wire from the ignition switched supply where it enters the fuse board, then following the existing loom across the engine, protected of course, to the coil top. So its just an ‘overlay’ to the existing wire so no need to go anywhere near the spider. Also a blocked crankcase breather can stall the engine. Edited February 2, 2021 by teabag Additional info added Quote Link to comment Share on other sites More sharing options...
Steeee Posted March 1, 2021 Share Posted March 1, 2021 Mine was the ignition amplifier on the back of the dizzy Quote Link to comment Share on other sites More sharing options...
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