 | Home > V8 > V8 3.9EFI appears to mis fire |
 
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| ARC99 Member Since: 19 Feb 2013 Location: North Yorkshire Posts: 1831   
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Had a similar problem years ago when I owner a RR and I asked the local stealer to set the engine up for unleaded petrol.
It ran sweet on the test drive, the next day I collected my caravan as I was due to go away, the RR struggled to pull the caravan up a slight hill only managing 20mph. To cut a long story short. After the garage ran up a £6.000.00 bill which they expected me to pay and six months later I took it to a specialist tuner who had a 4x4 rolling road they found that the distributor was 180 degrees out. Don't make old people mad. We don't like being old in the first place, so it doesn't take much to  us off.
Richard |
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24th Nov 2019 9:57am |
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| big ives Member Since: 24 Dec 2013 Location: Northern Ireland Posts: 125
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Arc99
when i set the timing i was sacred it would be out 180 degrees, so i removed the rocker cover twice and checked that No1 valves where closed and no tension on the springs. i marked the TDC on the fly wheel and installed the distrubuitor and connected everything and she started ok howvever this was last month and as i opened and serviced the distrubuitor however rebuilting it i damagaed the springs on the bob weights which when fitted i knew it was no good as i could here a noise. i got a price to rebuild my old Lucas 35dms but the cost was way way more than a new one from RPI, so i bought a new distrucitor and fitted it yeserday at the same marks on the fly wheel and as i said she runs sweet. maybe i need to recheck the TDC again for the new distrubitor  2016 Discovery 4
1989 90 CSW V8 (fully rebuilt and running like a dream) 1996 defender tray back fully rebuilt/loaded for challenge events |
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24th Nov 2019 10:21am |
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| oneten110 Member Since: 02 Jul 2011 Location: Wish I was still in France Posts: 741
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At any point during all the work did you have the injectors serviced or cleaned? It is not a Defender, it is a One_Ten
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24th Nov 2019 7:20pm |
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| big ives Member Since: 24 Dec 2013 Location: Northern Ireland Posts: 125
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oneten
no not serviced or cleaned had them out when i replaced the valley gasket but that was a month or so back, she has been driven since then 2016 Discovery 4 1989 90 CSW V8 (fully rebuilt and running like a dream) 1996 defender tray back fully rebuilt/loaded for challenge events |
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24th Nov 2019 7:37pm |
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| rallysteve Member Since: 10 Feb 2014 Location: Cumbria Posts: 2227 
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Have you checked that the vacuum advance operates correctly (you can suck on the pipe and the idle speed should change and it hold a vacuum)
Steve 02' 110 TD5 Double Cab Rebuild Thread |
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24th Nov 2019 8:22pm |
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| big ives Member Since: 24 Dec 2013 Location: Northern Ireland Posts: 125
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rallysteve
its a new dizzy, so no i didnt suck on the vacuum hose, but will check tomorrow 2016 Discovery 4 1989 90 CSW V8 (fully rebuilt and running like a dream) 1996 defender tray back fully rebuilt/loaded for challenge events |
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24th Nov 2019 8:31pm |
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| rallysteve Member Since: 10 Feb 2014 Location: Cumbria Posts: 2227
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Worth checking as it can lead to very flat acceleration.
Is it serpentine or pre-sepentine? Worth whipping out plug number 1 and checking that the TDC mark is actually at TDC. Mine was quite a bit out which meant the 8deg timing i had set was way off. Steve 02' 110 TD5 Double Cab Rebuild Thread |
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24th Nov 2019 8:45pm |
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| big ives Member Since: 24 Dec 2013 Location: Northern Ireland Posts: 125
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rallysteve
pre-sepentine as i said twice i checked the TDC by removing rocker cover and removing No1 to find TDC going to re-check everything again 2016 Discovery 4 1989 90 CSW V8 (fully rebuilt and running like a dream) 1996 defender tray back fully rebuilt/loaded for challenge events |
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24th Nov 2019 9:15pm |
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| rallysteve Member Since: 10 Feb 2014 Location: Cumbria Posts: 2227
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Apologies missed that post about the timing
Steve 02' 110 TD5 Double Cab Rebuild Thread |
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24th Nov 2019 9:32pm |
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| big ives Member Since: 24 Dec 2013 Location: Northern Ireland Posts: 125
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rallysteve
no problem 
i just cant figure out whats wrong, will try again and revert with any change 2016 Discovery 4 1989 90 CSW V8 (fully rebuilt and running like a dream) 1996 defender tray back fully rebuilt/loaded for challenge events |
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24th Nov 2019 10:02pm |
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| big ives Member Since: 24 Dec 2013 Location: Northern Ireland Posts: 125
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wee update
today removed the rocker cover and No1 plug rechecked timing marks TDC ok same as I had the last three times. removed the new dizzy and repositioned so the rotor arm was at the 5 oclock position. with dizzy out checked vacuum on the advance working as expected (new dizzy) checked plugs and leads all ok, should be only a few hundred miles on them reset base idle, rechecked the fuel pressure regulator (adjustable unit) set to 40psi with ignition on, drops to 34psi with engine running, stay at 34psi for a long time after the engine is stopped checked output on TPS which was a bit low 0.189v?? I had set t before to 0.354v, set back to above 0.50v checked all ignition wires to coils etc and renewed and crimped what was needed. set timing to 9 degrees BTDC test run and drove her hard, the misfire or hesitating on full throttle not as bad as the other day, 99% better but as I have OCD I need to get her to 100% but that’s for another day 
fitting a new LOF powerspec clutch and master cylinder tomorrow, oh the joys of owning a landrover 
thanks for everybody’s input  2016 Discovery 4
1989 90 CSW V8 (fully rebuilt and running like a dream) 1996 defender tray back fully rebuilt/loaded for challenge events |
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25th Nov 2019 4:44pm |
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| big ives Member Since: 24 Dec 2013 Location: Northern Ireland Posts: 125
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now running like a dream
 100%, fires up on the first tuen of the key
set TPS back to 0.315v serviced and rebuilt my old lucas dizzy and installed re-set timing to 10 degress BTDC re-set base idle happy days until the next issue 2016 Discovery 4
1989 90 CSW V8 (fully rebuilt and running like a dream) 1996 defender tray back fully rebuilt/loaded for challenge events |
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8th Dec 2019 5:23pm |
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