Davewillb Posted July 19, 2013 Share Posted July 19, 2013 Hi, My Disco 3.5v8 has spluttered couple of times part way round roundabouts recently, tonight it did the same but then over the next 100yds on the straight the engine missed and died. I pulled over and it would start but was running on about 2 cyl on both gas and petrol, wouldn't rev. I did the usual bonnet up, checked ht leads, nothing obvious amiss, tried again, started on 2 cyl, pumped throttle violently got a few more revs the suddenly cleared and revved normally. I drove the rest of the way home (10 miles) with no problem at all. Weird, please someone tell me this happened to you and it's.............? Cheers, Dave Quote Link to comment Share on other sites More sharing options...
Buzzliteyeh Posted July 19, 2013 Share Posted July 19, 2013 hi I've just bought a disco 3 v8 with LPG was wondering what your mileage is like ? thanks Quote Link to comment Share on other sites More sharing options...
Davewillb Posted July 20, 2013 Author Share Posted July 20, 2013 Hi, It costs me about £25 of gas to do 150 miles so by a very rough comparison 300 miles at a cost of £50 feels roughly equivalent to what it would cost me to run a Tdi. Not cheap motoring either way but I don't much like diesels and I really do like my V8 (except when it breaks down) so I'm happy. Dave Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted July 20, 2013 Share Posted July 20, 2013 Given the current heat in the UK, I would be looking at ignition amplifier. Quote Link to comment Share on other sites More sharing options...
Davewillb Posted July 20, 2013 Author Share Posted July 20, 2013 Thanks Bowie69 - think I'll order one, worst scenario it will be eliminated. Cheers, Dave Quote Link to comment Share on other sites More sharing options...
Davewillb Posted July 22, 2013 Author Share Posted July 22, 2013 When I went to start it on Sunday morning, when it was still cool, it was very reluctant which isn't normal at all but it had driven faultlessly for 10 miles after breaking down on a main A road on Friday evening. It will be very interesting to see if the new module fixes it. Out of interest, is it possible to fit the module by loosening the distributor and turning it rather than removing it completely? 30 degrees clockwise would make both philips screws accessible from the front. Dave Quote Link to comment Share on other sites More sharing options...
Davewillb Posted July 30, 2013 Author Share Posted July 30, 2013 Update - ignition module fitted and it hasn't broken down since but its still not running quite right, it misses a bit on over run and hunts as well, dosn't start quite as easily and generally doesnt seem quite right. Its the same on gas and petrol. I've recently replaced the distributor cap, rotor arm, leads and plugs (all decent stuff) this was before the recent breakdown but only 5 or 600 miles, now I've done the ign amp and I'm wondering about the coil but in the past coils have either worked or not for me ..... do they go intermittent or low output?? I've got software and a lead to look at the output from the 14CUX and all looks ok there, no faults recorded airbypass working and airflow meter providing changing voltage.... The idle is a bit intermittent still despite a new bypass valve,it improved when I replaced it but still tends to hold high revs for a few secs before dropping to slightly too low and then corrects itself eventually. Timing is about right and advance is working. Air leak maybe??? Any suggestions appreciated. Dave Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted July 30, 2013 Share Posted July 30, 2013 I've recently replaced the distributor cap, rotor arm, leads and plugs (all decent stuff) What make? When I had a dizzy, only LR genuine stuff would go on it, anything else broke down after a few hundred miles.... Quote Link to comment Share on other sites More sharing options...
Davewillb Posted July 30, 2013 Author Share Posted July 30, 2013 Well it said Lucas on the boxes and it wasn't cheap, but having said that from what I've read recently that's no guarantee so maybe I'm assuming too much. Guess the distributor cap / rotor arm are possible contenders again. Are you running megasquirt / jolt then? I've started collecting bits for megajolt and just about have everything except the ecu now ( the expensive bit!!) but I don't really want to be forced into doing it now with a lot of other stuff on the go ATM. ...... and a holiday planned with any luck that needs the Disco mobile. Dave Quote Link to comment Share on other sites More sharing options...
Tanuki Posted July 30, 2013 Share Posted July 30, 2013 Check the routing of the HT leads: it's not unknown for 'cross-firing' to happen on the Rover V8, where a spark being sent to one plug leaks across to an adjacent plug if the leads are touching, and partially 'fires' a cylinder on the intake stroke. A Range-Rover of my acquaintance many years back would periodically do an enormous machine-gun backfire-through-one-carb to the point where all the dashpot oil got blown out of one side's Stromberg every few hundred miles. Rearranging the HT leads, tying them down with cable-ties so they didn't flail about under hard cornering, and replacing the plugs solved it. Quote Link to comment Share on other sites More sharing options...
Davewillb Posted July 30, 2013 Author Share Posted July 30, 2013 Thanks for that suggestion Tanuki, I have pulled things about a lot getting the distributor out, fitting the ign amp and getting it back in again and timed so thats definantly a possible - it would be fairly typical wouldn't it, fix one problem and cause at least one new one in doing so, worst scenario with similar symptoms to the original problem. Dave Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted July 30, 2013 Share Posted July 30, 2013 Yeah, I'm on Squirt, but have MJ'd a few vehicles as well, it is a great system, and very easy to fit.... Cost of the ECU would soon be recouped by not having to buy dizzy caps and rotor arms Quote Link to comment Share on other sites More sharing options...
Davewillb Posted August 1, 2013 Author Share Posted August 1, 2013 Like the thought on savings to pay for the MJ ECU, neat thinking. I may be close to sorting my problem though, today my wife could hear a ticking noise while we were driving and I'm fairly confident it's coming from a solenoid on the LPG tank at the back, if the lpg supply is going on and off intermittently that would explain a lot.......still think the ignition amp was playing up as well, but I'm getting to the point where I've changed too many things to be sure anymore, timing, ign amp, layout of ht leads. Dave Quote Link to comment Share on other sites More sharing options...
Davewillb Posted August 2, 2013 Author Share Posted August 2, 2013 Update - well I traced the wiring to the solenoid on the tank and guess what, two twisted joins taped over with what looked a lot like sellotape and the twisted wires were unsuprisingly tarnished. While dealing with this I noticed that the solenoid makes a loud click when power goes on, but is silent when it goes off; thinking about it I have heard this click a few times without realising what it was, so it looks like the gas supply was going off occasionally ....... possibly helped by the twisting forces when going around a roundabout! I've also checked the HT lead runs (Tanuki) and tidied that up a lot, and added some cable ties using the two ties trick to keep them spaced .... one cable around the HT leads and another over that one between the leads so that tie keeps the leads seperated. Things seem better and the engine is definately smoother ..... still having got the idle speed consistent though so next on the list is looking for air leaks I guess. This is the no lambda sensor, no Cat simple 1992 14CUX system so hopefully it won't be too difficult to sort this last (for now) problem. While I'm on a winning run I've also sorted out the central locking so all the doors now lock instead of half opening while the other half lock and the back door not doing anything as the actuator was missing and the classic little spring also broken - what a pig of a job replacing one of those is!!! Anyone got a set of lock barrels with a key or a speaker amp for the rear door - my locks don't match the ignoition key and the speaker is missing completely. Dave Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.