 | Home > V8 > Misfires are back! |
 
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| L110CDL Member Since: 31 Oct 2015 Location: Devon Posts: 10765  
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I hope the ebay win sorts out your problem to Charcoal
 1996 Golf Blue 300Tdi 110 Pick up.
Keeper. Clayton. |
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24th Dec 2016 7:52pm |
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| charcoal Member Since: 28 Jul 2014 Location: Hampshire Posts: 942  
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Thanks for the suggestions Tim, I did notice while replacing the ignition coil that an earth wasn't connected properly, amending it made no difference though. Can always try with a separate cable though. I'm sure there is no water in the fuel, will be fitting an aux fuel tank soon which will mean the tank will get emptied yet again anyway.
Thanks Clayton, will have two pairs of carbs to try when they arrive 1999 Land Rover Defender 110 td5 station wagon
1998 Land Rover Defender 110 County Station Wagon ~ Sold 1995 Land Rover Defender 110 V8 Station Wagon ~ Sold 
1985 Land Rover 110 ex mod project Tithonus ~ Sold |
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24th Dec 2016 9:51pm |
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| Rickydodah Member Since: 14 Jul 2014 Location: East Sussex Posts: 1091 |
Have you tried reversing the coil polarity to see it if makes a difference?
 I started with nothing and still have most of it left! |
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24th Dec 2016 11:24pm |
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| charcoal Member Since: 28 Jul 2014 Location: Hampshire Posts: 942
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Haven't tried that actually, upon more research it sounds like that can cause starting problems and misfires under load. Before I try it, it shouldn't cook the ignition module right? 1999 Land Rover Defender 110 td5 station wagon
1998 Land Rover Defender 110 County Station Wagon ~ Sold 1995 Land Rover Defender 110 V8 Station Wagon ~ Sold
1985 Land Rover 110 ex mod project Tithonus ~ Sold |
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26th Dec 2016 1:57pm |
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| Rickydodah Member Since: 14 Jul 2014 Location: East Sussex Posts: 1091 |
It shouldn't harm the module as it only reverses the direction of the electron flow. I say it shouldn't as I've known a few examples where the coil was mistakenly connected incorrectly and not caused any damage. In fact one engine would only start with the polarity reversed........and for the life of me I still cant understand why as in reality all it does it make the spark at the plugs jump in the opposite direction. Modern coils with distributor less ignition often have half the cylinders on reverse to the the others; you could see the effect of this by looking at the sparking plugs whereby half would wear the central electrode and the others the earth electrode. Good luck
I started with nothing and still have most of it left! |
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26th Dec 2016 6:15pm |
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| charcoal Member Since: 28 Jul 2014 Location: Hampshire Posts: 942
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This afternoon I switched the polarity of the coil. There is no noticeable change in cold starting the engine. This evening I left work without warming up the engine first and had no misfires. I had been tarting around with the choke though after starting it, pulling it in and out to find the best position to hold it in. So if the polarity of the coil didn't fix it that more or less confirms it's a problem with the carburettors. The polarity also did not cure the misfires at motorway speeds. 1999 Land Rover Defender 110 td5 station wagon
1998 Land Rover Defender 110 County Station Wagon ~ Sold 1995 Land Rover Defender 110 V8 Station Wagon ~ Sold
1985 Land Rover 110 ex mod project Tithonus ~ Sold |
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28th Dec 2016 12:04am |
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| charcoal Member Since: 28 Jul 2014 Location: Hampshire Posts: 942
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A few days have passed since I swapped the polarity of the ignition coil and I've had to do quite a few cold starts. Each time I've been able to drive away right after getting her going and not had a single misfire because of it. Many thanks Ricky for suggesting something that never even appeared to be wrong (power is now going into -1 terminal instead of +15). Maybe the battery had it's polarity swapped to use radio equipment as she was an airport vehicle many years ago. Anyway I still have the misfire at high speeds so the carburettors I bought will not go to waste. 1999 Land Rover Defender 110 td5 station wagon
1998 Land Rover Defender 110 County Station Wagon ~ Sold 1995 Land Rover Defender 110 V8 Station Wagon ~ Sold
1985 Land Rover 110 ex mod project Tithonus ~ Sold |
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30th Dec 2016 2:35pm |
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| L110CDL Member Since: 31 Oct 2015 Location: Devon Posts: 10765
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Half way there Charcoal
1996 Golf Blue 300Tdi 110 Pick up.
Keeper. Clayton. |
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30th Dec 2016 7:37pm |
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| charcoal Member Since: 28 Jul 2014 Location: Hampshire Posts: 942
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Yep Clayton! Turns out the slightest bit of moisture in the air makes the misfires come back. At least most cold starts are in the cold with no serious moisture. 1999 Land Rover Defender 110 td5 station wagon
1998 Land Rover Defender 110 County Station Wagon ~ Sold 1995 Land Rover Defender 110 V8 Station Wagon ~ Sold
1985 Land Rover 110 ex mod project Tithonus ~ Sold |
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1st Jan 2017 6:01pm |
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| charcoal Member Since: 28 Jul 2014 Location: Hampshire Posts: 942
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Quick update guys. New carburettors are fitted and the engine ran so much better. Started with less that a single revolution and sounded as smooth as a sowing machine. The reason I'm talking in past tense is because it will die on its own and if that happens it can't be started for another hour or so, when running it will run perfectly fine while revving. I'm fairly sure its low state of tune is flooding the engine on idle causing this. Will try and correct the mixture tomorrow so if anyone has any other suggestions in the mean time I'd like to hear them. 1999 Land Rover Defender 110 td5 station wagon
1998 Land Rover Defender 110 County Station Wagon ~ Sold 1995 Land Rover Defender 110 V8 Station Wagon ~ Sold
1985 Land Rover 110 ex mod project Tithonus ~ Sold |
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12th Jan 2017 11:58pm |
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| muddypaws Member Since: 22 Jan 2013 Location: Leicestershire Posts: 122 
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If your theory is correct, (& I think it is) then its a simple fix on SU's Richard
Defender 90 SVX |
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13th Jan 2017 3:19pm |
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| charcoal Member Since: 28 Jul 2014 Location: Hampshire Posts: 942
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Had a right fiddle with them this afternoon with no success. When I took the elbows off the plastic tube behind the carburettors had a big puddle of petrol in it. I lowered the pressure in the regulator, set the jets to about 2mm below the bridge (half a turn as suggested on another forum). It can run for a bit but then the idle will decrease and stop and if it does it again wont start again, will fire a few times if you try and start it again quickly but doesn't catch on. Anything else I should look at? 1999 Land Rover Defender 110 td5 station wagon
1998 Land Rover Defender 110 County Station Wagon ~ Sold 1995 Land Rover Defender 110 V8 Station Wagon ~ Sold
1985 Land Rover 110 ex mod project Tithonus ~ Sold |
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13th Jan 2017 3:26pm |
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| muddypaws Member Since: 22 Jan 2013 Location: Leicestershire Posts: 122
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What have you turned the fuel pressure down to?
From memory, I used to use ~3 but that was for a 4 litre RV8 with richer needles Richard Defender 90 SVX |
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16th Jan 2017 8:30am |
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| GREENI Member Since: 22 Aug 2010 Location: staffs Posts: 10383
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I'm going to be honest here, if it were mine, I'd have pulled it out by now
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16th Jan 2017 8:48am |
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