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I have recently replaced a leaded 1985 4.1 for an unleaded 1986 engine. The distributor and wiring loom on the newer engine was different so I put the older distributor (which suits the loom wiring on my 85 model). Although I have it on Number 1 cylinder TDC It will not fire the unleaded motor. I have spark. I have fuel. I do get detonation in the carby that tends to indicate timing but moving the distributor a cog either way will not start the motor.
Does anyone know if I need to use the unleaded engine 's distributor or have any suggestions. I do not have a motor manual and the one at the local library must be the most popular book on the shelves it's always out. Perhaps this is not a good sign for owning an XF!
But seriously it is a good car and I need to get it back on the road. Any help would be appreciated.
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i think the unleaded Vx Leaded motors ran different compression ratios.. i am not sure if tthis would have an effect on wit tho.
Just a suggestion
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If its backfiring through the carby it's an almost dead certanty that you have the ignition timing 180degrees out.
Try swapping leads 1-6, 2-5 & 3-4 on the distributor cap & I bet it fires right up.
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it won't matter what dissy you put in that car(it will even run on a points dissy,but electronic are so much better)so like someone said before,a common problem when putting in a dissy,is people putting them in but 180 degrees out.this means that you have
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Have u got the right coil?
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Yes. I tried a standard one and a Bosch from the older engine
Thanks John
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Yes I tried 180 degrees on the distrtibutor. Even though I was careful about this when I took it off. I used a screwdrver down number one and turned the motor until I get TDC in both positions. Both ways it backfires in the carby.
Thanks Jim
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I will try and find out.
Thanks
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Yes. I tried this.
I have had the front pulley off. But this went back on with the key okay. But even so using a screw driver down the plug hole to find TDC on number one (by turning the motor until the screw driver is out as far as possible).
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there easy to work on,not much to go wrong.its most likely something simple,so don't go to crazy.
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Take rocker cover off. Turn motor by hand until the intake valve on 1 opens and continue turning till it just closes. Check the rotor, is it pointing more or less to No 1 terminal? Also turn the ignition on, pull all the plugs out, sit No1 on a spot where
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