The V8 Owners Forum -

OK all fixed !!! Turns out it was injector No 4 it was shorting to earth so as soon as it got a +ve it was operating. The relays to turn off the injectors when on LPG turn off from the earth side of things (I have since discovered) so even when on gas that injector was still pumping petrol in. Why ...

OK all fixed !!! Turns out it was injector No 4 it was shorting to earth so as soon as it got a +ve it was operating. The relays to turn off the injectors when on LPG turn off from the earth side ( I have since discovered) so even when on gas that injector was still pumping petrol in. Why though bec...

Ive just metered the pins on the injectors for continuity to earth.
All the on the problem bank, 2,6,8 have no continuity to earth but my suspect injector shows continuity to earth on both pins.
so if they are fed a constant live and switched on their earth that might be my problem...

OK Then Good news and Bad new.. Good news is, Ive fitted a new fuel pressure regulator Bad news, it didn't fix it Although the day is not completely lost. It runs on gas. I have a question. 1. how are injectors wired ? 2. how are they fired ? My reason for asking is this. After a process of eliminat...

Just a quick update, got the part today but it was wrong. right for the chassis number but wrong for my Disco !! ah well they have the right one and its on its way. Im away from tomorrow till monday so will have to leave it for now. will post up when the correct part turns up and Im back home !!! Andy

Tom Great idea with the airline. Using the compressor on the disco ( for the lockers) I rigged up an air line to the fuel in on the FPR when I squirt air in it defiantly blows out of the vacuum pipe. I put the pipe in some water and was getting bubbles !! I guess if that was on the car and the air w...

Hi Chris, thats the plan. Ive ordered a new FPR from Rimmers. on the basis that when replaced with a new one I can discount it. some one else has said it could be leaking injectors... but one step at a time! Im feeling a little more positive now, its good to hear the motor running properly a last, a...

OK an update, I have removed the fuel pressure regulator, blocked the vacuum tube that fed it, removed the fuel pump relay, and disabled the injectors (they can be turned off by two relays as part of the LPG system) cleaned up the plugs and tried to start it on LPG only and BINGO fired first time pe...

mgbv8 wrote:If there was lots of petrol in the oil you may have washed it out and starved bearings of oil??

Yes, this may well be the case, will check and change the oil again tomorrow
and see how it goes if I can get it running.

Does the Hotwire have the gadget that alters fuel delivery pressure with manifold vacuum? As you say, a duff diaphragm could allow neat fuel into the inlet manifold. You could prove this by unplugging the vac feed to the fuel pressure regulator. I believe that the fuel Pressure regulator is "d...

ChrisJC wrote:So, it can run on LPG OK if the petrol tank is empty. Yet if there is petrol in the tank, it runs badly.

Yes !

Hiya guys and thanks for all your comments and thoughts so far. when I posted yesterday I was very stressed and beyond cold !! I have calmed down now and have had a good think about the order of things etc... So it is a 3.9 EFI Hotwire It is EDIS 8 The coil packs are all in good nick and I have spar...

Hi, 3.9 V8 LPG single point using a Lambda control And the ignition is Mega jolt Engine has a mild tune (stage 2 heads etc but prob not relevant at the mo) OK Started over-fuelling like crazy have replaced plugs, leads, and coolant temp sensor. Discovered loads of petrol in the oil, changed the oil....

Hi Rob,

Long time no see!!

Im back from AbuDhabi on the 7th of Dec, I could pop round and have a look if you haven't had a chance by then...

Andy