2003 disco 2 V8 HSE cranks , wont run, help.

[cch]

Gday All, I have an 03 V8 hSE disco 2 and Got the disco engine bay wet and then died on me , was running at the time it got wet, I have checked the fuel cutoff switch and changed(even used bypass to check), fuel pump runs and has been checked,have spark at all cylinder,can get to run with spray start into inlet but wont run like injectors are not working, I have even changed the crank angle sensor also, idle air cntl vlv works aswell, anyone got any ideas ,its driving me mad,cheers.

[DieSchnelleKafer]

Gday All, I have an 03 V8 hSE disco 2 and Got the disco engine bay wet and then died on me , was running at the time it got wet, I have checked the fuel cutoff switch and changed(even used bypass to check), fuel pump runs and has been checked,have spark at all cylinder,can get to run with spray start into inlet but wont run like injectors are not working, I have even changed the crank angle sensor also, idle air cntl vlv works aswell, anyone got any ideas ,its driving me mad,cheers.

Its always worth finding someone with a nanocom or a scanning tool, it can save you hundreds when trying to resolve a single issue. However, since theres quite a lot of sensors that can become faulty, and still let the car turn over and run, your problem is narrowed down to a little.

check to see if you have destroyed the fuse number 1 in the engine compartment fuesbox. This fuse supplys all 8 injectors with +ve supply. If you have blown that, it will not fire the injectors.

[cch]

Hi, Yes I have a scan tool but shows nil codes due batt . went flat and all codes lost, I will check the fuse you suggested , cheers

[cch]

Hi, Yeah changed the fuse still no joy , checked all fuses/ relays ok,any thoughts , might have to get auto elec. to come visit for loose wire/short in system unless anyone has further to add, cheers.

[FisherX]

I had the same thing on my old D2 V8. What worked for me is unpluging all the conections on the ECU and plugging them back in. She started straight up.

Don't know why I had no fault codes either and changed the crank angle sensor as well, but it worked for me.

[cch]

Hi , thanks for that will give that a try , anything at this stage, I also checked the relays etc.. today again and all good, one point though do you think I would lose the ecm settings, did you disconnect one at a time or all at once,cheers

[bee utey]

The brown/orange stripe wiring that feeds power to the injectors also feeds various other small electrical parts around the top of the engine. Find that colour wire and test it for power with the ignition on. All the brown/orange stripe wires join in a "clinch" in the main harness at the back of the engine. Cutting the right wires for LPG conversions is paramount so I'm used to getting at those wires.

[FisherX]

I don't think that unplugging the ECU will cause any issues. I had mine unpluged for weeks when I did an engine rebuilt with no adverse effects.

I just unplugged them all to look at the connectors, mainly cause I tried everything else to get it running. Thought they may of had a bit of corosion on the pins or plugs, but they all looked fine. Plugged them back in and bam, started straight away. Had me scratching my head and saying WTF, but it started and I was happy.

[cch]

Hi Gents, tried & unplugged all ecu connectors and reconnected, still no joy, I will try finding pwr to the wire you suggested when batt is recharged, thanks for all your help gents I;m really appreciating it all,cheers.

[Roverlord off road spares]

if you have a nanocom or simlar, maybe try the learn security function, long shot, but couldn't hurt to try, it might just start .
cheers,

[Pedro_The_Swift]

What stops a V8 from starting,,
coil packs only cause a miss, and the usual culprit, the CAS usually fails when hot,, not after you've just cooled/hosed it.
I wonder if its a security thing?
Stored errors are next I reckon,, but will the ECM "store" errors if the car wont start?
You out there Sierrafery?

[AK83]

Definitely won't be spark related as OP said this


.... can get to run with spray start into inlet but wont run like injectors are not working ....

So with the use of this spray start, will the engine continue to run if you continue to spray? or does it eventually die if you continue to spray as well.

[trout1105]

It sounds like the "Inertia Switch" may be the problem here as the engine will turn over and has spark.
The Inertia Switch cuts the fuel supply when activated [thumbsupbig]

[AK83]

OP says they got water in the engine bay(doesn't say how).
Could water have got into the fuel system too?

eg. was the wet engine bay after a river/creek/floodway crossing, or was it in pressure cleaning the engine bay, or .... ?

Wet ECU?

[Pedro_The_Swift]

not unless it sat in water up to the seat squabs,,

[Roverlord off road spares]

It sounds like the "Inertia Switch" may be the problem here as the engine will turn over and has spark.
The Inertia Switch cuts the fuel supply when activated [thumbsupbig]
I was thinking along those lines but OP said he checked the fuel cut off switch .

[cch]

Hi Gents,got wet with low pressure hose just getting rid of dirt in engine bay, tried and replaced fuel cutoff switch, checked and changed fuel pump but was ok,replaced cas, iacv,fuel relays,checked all fuses, removed/ reconnected ecu connectors.injector bank didn't seem wet as I removed top plenum to check, yes it runs with spray into inlet ok and continues to run when constantly sprayed, could possibly be a security /immobiliser issue ,I didn't think of that.I see a lot of you fellas use a nanocom, how effective are these diagnostic tools ?as I see they are quite expensive. p.s also checked first after getting wet if water ingressed thru firewall into ecu wiring and was dry as the seal was intact also. cheers.

[ozscott]

It could be coincidence. My V8 would spin over and not even consider firing. It was what LR call their Intelligent Driver Module containing fuse box...ie the large one in front of your right knee when driving. When you change it it needs 15mins with ignition on for the IDM and the computer to coordinate. Mine then fired straight up. You changed CAS so good but did you check fuel pressure? Cheers

[AK83]

.... could possibly be a security /immobiliser issue ,I didn't think of that .....

Only two experiences I've had with immobiliser was that it totally locked the car, in that engine wouldn't turn over, crank or nothing.
D2 V8(mine) and TD5(brothers) both were due to low volt batteries. But in both instances we had no cranking of engine.

So it there a immobiliser situation where it allows the car to crank over too?

[Roverlord off road spares]

Only two experiences I've had with immobiliser was that it totally locked the car, in that engine wouldn't turn over, crank or nothing.
D2 V8(mine) and TD5(brothers) both were due to low volt batteries. But in both instances we had no cranking of engine.

So it there a immobiliser situation where it allows the car to crank over too?
When I fried my ECU (D2 V8) I installed a new ECU, it would crank and not run, I did the learn security function and it synched the system and it fired. So hence thinking it my be worth a try.
Another thing to check is is the fuel pump actually running. are you getting a feed of 12 volts to it . If not then there is a power supply problem somewhere in the wiring ,.

[cch]

Hi Gents, have narrowed it down to the fuel pump, I think it may have shorted as I can use air compressor on the fuel bleed valve and backpressure the tank ,it then runs for a short time until pressure in tank goes down, maybe its not running , I will check pwr to the pump wiring now,cheers.

[cch]

Hi Gents, thanks for all your help with this issue, finally got it sorted ,it was the fuel pump wiring and wrong sender signal showing 1/4 tank of fuel when actually nearly empty , so simple but easy to miss,cheers