gbmoto Posted March 19, 2022 Share Posted March 19, 2022 (edited) Morning all, me again with my challenging 3.9 90 I was always confident around Landy's but this is being an education! Generally built well but as with most specials can be a little eccentric. Soooo yesterday I installed a radio, centre of the dash using the landy cabling. Radio works fine. Also added an oil pressure gauge as I had that part of the dash apart. Just ran the cable and connected live and earth..... the sender for another day...... but just had a look at the locations by the oil filter. I touched the wire to the transmitter thingy and it fell apart....... baked from being close to the tubular headers I guess. Anyway, added a new connector and thought nothing more. Just putting tools away and thought I had best fire it up........ no power to the fuel pump! Checked all fuses and fine. All the wiring has been put back to as before. ( Wireing is pretty much custom with blade fuses etc, well done but a bit of a struggle working out what fuse does what! ) Have also lost indicators, but hazards are fine..... this could be the hazard switch although bizarre it happening at the same time. I have no oil light...... I think this could be significant and related to the transmitter....... I have heard this can cut power to the fuel pump as a prevention of blow ups?? Soooo what has happened, do I just need to run another cable to the transmitter, can I by pass it totally.... just for testing? Family things today so back on it tomorrow........ Suggestions/confirmation appreciated. Edited March 19, 2022 by gbmoto Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted March 19, 2022 Share Posted March 19, 2022 What's running the engine - carbs, EFI, custom install or old factory loom...? Quote Link to comment Share on other sites More sharing options...
JohnnoK Posted March 19, 2022 Share Posted March 19, 2022 Like Fridge says, your configuration will determine troubleshooting. Some systems have a switch on the oil gallery that is Tee'd into the oil pressure transmitter location to power the pump when it senses oil pressure from cranking. If its a cobbled together system.......oh boy.... Quote Link to comment Share on other sites More sharing options...
gbmoto Posted March 19, 2022 Author Share Posted March 19, 2022 Really sorry, should have explained more, it is a 3.9 efi. all pretty much as it came from a Range Rover. Quote Link to comment Share on other sites More sharing options...
Eightpot Posted March 19, 2022 Share Posted March 19, 2022 The fuel pump is triggered from the ecu on a 3.9 from memory as standard, though on a conversion who knows. You'll have to trace the wire from the pump forwards and see where it pops out... Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted March 19, 2022 Share Posted March 19, 2022 Yep, flapper & hotwire systems both control the fuel pump - they need to see the trigger signals from the coil -ve (pulses) and some airflow through the AFM, the flapper has an actual switch on the flap, I presume Hotwire just senses it somehow. Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted March 19, 2022 Share Posted March 19, 2022 I think hotwire just relies on the spark. Quote Link to comment Share on other sites More sharing options...
gbmoto Posted March 20, 2022 Author Share Posted March 20, 2022 Thanks Chaps. I am amazed I have managed this with a Radio Install..... usually fairly happy with electrickery and wiring. I have made a complete loom for a series.... much simpler admittedly, but my recent efi experience was years ago with my daughters Classic Min MPi..... which was quite simple tbh. Currently have the dash apart just to make sure I didn't move anything. I think first job will be to replace the transmitter wire, I'm thinking it has probably crumbled inside, I want to see the oil light! Hopefully will get a bit of time today....... I will return! Quote Link to comment Share on other sites More sharing options...
gbmoto Posted March 25, 2022 Author Share Posted March 25, 2022 Well, it's sorted. Unpicked some of the harness..... hmm that will be work in progress!! Remade oil sender wire etc and routed them away from the headers. But still nothing, looked for an inertia switch but no, checked all fuses relays etc and all seemed fine. Sat in the driving seat and had a check as to what was working...... the horn. hazards and starter..... that was pretty much it, and no dash lights...... hmmm again.... So dash was pretty apart and had had several good looks around with a torch where I had been messing but all good......sooo out with the gauges to see in a bit further.....as I was getting a bit suspicious of the ignition switch.....oooooo... a big white wire has fallen off..... plug in and all back in business, perplexing as I had been no where near there, must have been where a cable had been pulled through..... but all working...yayyyyyyyyyy But now the radiator has sprung a leak..... and also still need to work out what water pump..... at least I can do both at the same time. Oh and during the storm had a ridge tile come off, take 2 tiles off on the way down to then launch themselves at the Landy leaving some fairish dents in the bonnet and wing and taking a bit out of one of the light trims..... adds character I guess! I should do an ongoing thing about the Landy, it is being a bit of a challenge!, but it does make me smile when I drive it. 2 Quote Link to comment Share on other sites More sharing options...
Escape Posted March 25, 2022 Share Posted March 25, 2022 6 hours ago, gbmoto said: it does make me smile when I drive it. That's what it's all about! Glad it was an easy fix in the end. 2 Quote Link to comment Share on other sites More sharing options...
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