Range Rover P38 Misfire. Here we go again!

Hi all

My Range Rover P38 (X) 2000. 4.6L V8 Petrol/LPG has started misfiring again! Last time it was an inlet manifold gasket with no fault codes to help! Luckily or not it has given me a fault code this time and it is as follows

P1319

P1319 Land Rover Misfire with Low/Empty FuelDrive cycle C:Signal out of range - above maximum

I can obviously read what it sais and I have looked at all the other posts with this P1319 reference but what does it mean.

Can anyone give me some detail on this unhelpful explanation for Fault Code P1319?

Thus far I have changed my plugs.
Compression tested all cyinders - all at 12 Bar
HT Leads giving a pulse but unable to test how strong.
Plenty of fuel in my tank!

Once again guys I value your input so thank you in advance for your contribution.

Cheers

Bison

fuel pump relay then fuel pump would be my next check from what that code relates to,i dont think theres a fuel pressure regulator well cant remember seeing one when i changed my engine last week,but my short term memory is shot anyway lol,good luck with it

Does it misfire on both petrol and gas, if so I doubt it's the fuel relay or pump because the gas has a separate system and injectors. Could be the coil pack which doesn't normally throw up a fault code of it's own..

clarkie said:

fuel pump relay then fuel pump would be my next check from what that code relates to,i dont think theres a fuel pressure regulator well cant remember seeing one when i changed my engine last week,but my short term memory is shot anyway lol,good luck with it

Click to expand...

Thanks for your input Clarkie. The fuel pump is something I will be checking shortly.

Cheers Bison

spender said:

Does it misfire on both petrol and gas, if so I doubt it's the fuel relay or pump because the gas has a separate system and injectors. Could be the coil pack which doesn't normally throw up a fault code of it's own..

Click to expand...

Spender. Thanks also for your input. It misfires mainly on petrol and when under load. Especially when I put my foot down to over take.

I forked out a whole lotta cash today for a coil pack. (Cheaper to by the coils seperately than to buy the coil packs mounted on the bracket. 8 small srews to change them over!) Anyway, I have changed the coil pack and it has made no difference.

Bugga!

Cheers

i would think of checking leads as i had a simlar problem
i was misfireing but when i checked the plugs they were all sparking like they should turned out i wasnt getting a full current spark! but in the mean time the misfire had destroyed one of my cats.
and they aint cheep!!
you dont have to buy a new set just yet. get a lead from a mates car (one that you know works) and change it with one of yours and go for a drive, then change if to another leads and go through all the leads one by one the same way.

Thanks gfromleeds

My HT Leads are only 8 months old! That doesnt mean that there isnt a problem with them. I have bought a 2 new HT leads and am going to try what you suggest.

Thanks for your input.

Cheers

Bison

Hi All

I have slaved in 2 new HT Leads in and no change. Still got the misfire! It is awfull on petrol but hardly noticeable on gas. I wonder if there are 2 issues! One on the gas which is very minor and one on the petrol which is awfull!

Fuel pump investigation next.

Any other theories welcome.

Cheers

Bison

Hello again mate
have you checked the engine earth straps theres 1 on the back of cylinder head by bulk head,1 by alternator,1 under fuse box,worth a check and a clean,
does the car start first turn of the key from cold on a cold day,if it takes 10 seconds or so before fireing up it could still be the fuel pump not supplying enough pressure,
i had a misfire problem with my wifes audi v6 turned out to be plugs.

just to make you smile my heater core o-rings failed today smell of coolant in the cab and a **** wet carpet,never a dull moment with a p38a range rover lol

all the best with it mate
Adie

Hi Clarkie and all

Clarkie: Leaking coolant into the cab no laughing matter! Sorry to hear that. Never a dull moment indeed!

All. Originally I took the car to a local car electrics specialist who gave me the code P1319 Land Rover Misfire with Low/Empty FuelDrive cycle C:Signal out of range - above maximum. Useful info one might say!

Well I got a little cheesed off yeasterday because I was getting nowhere with my investigations. So before I delved into fuel pump investigation I decided to contact MDP landrover of Monmouthshire. I spoke to a guy called Craig and he was massively helpful. Just bring it up and we will plug it in right away. I liked the sound of "right away"!

Its a bit of a trek from Newport to Raglan but I was excited with "right away"

I arrived and as promised he plugged into my P38 "right away" and I wont go into the detail of all the faults that came up but essentially one bank of the engine was running like a bag of spanners.

He reset all the values and said take it for a spin and we will go from there.

Well you guessed it! I took it for a spin and it was sweet as a nut!

There was a very reasonable small charge for the service which I was very happy to pay.

So fuel value reset was the solution.

What did I learn from this investigation. Always go to a landrover specialist who has got the landrover gear to get your diagnosis!

Hope this helps

Bison

What you also need to learn from this is that your LPG system is what caused the fault in the first place.It is not trimming the same way as the ecu would if it were running on petrol all the time.The net result is that the long term fuel trims are so far out that the short term trims cant go wide enough to fuel it properly.
The LPG needs adjusting or a service then readjusting.
Your misfire code can also be logged when the car swaps from petrol to LPG if the changover is set at low coolant temps or is not a sequential changover.

Bison said:

Hi all

My Range Rover P38 (X) 2000. 4.6L V8 Petrol/LPG has started misfiring again! Last time it was an inlet manifold gasket with no fault codes to help! Luckily or not it has given me a fault code this time and it is as follows

P1319

P1319 Land Rover Misfire with Low/Empty FuelDrive cycle C:Signal out of range - above maximum

I can obviously read what it sais and I have looked at all the other posts with this P1319 reference but what does it mean.

Can anyone give me some detail on this unhelpful explanation for Fault Code P1319?

Thus far I have changed my plugs.
Compression tested all cyinders - all at 12 Bar
HT Leads giving a pulse but unable to test how strong.
Plenty of fuel in my tank!

Once again guys I value your input so thank you in advance for your contribution.

Cheers

Bison

Click to expand...

put code into gloogle, your answer will be there.

Glad you got it sorted in the end mate,

thanks for posting the solution to your problem as many dont and it dont help others with a similar fault.

Hi all , I'm a new member and have joined this site as a result of the excellent advice from Bison . I run a local mobile diagnostic service and was recently called in to a 4.6 p38 Range Rover 2002 with identical syptoms and fault codes as Bison's machine . This vehicle has had a new coil pack , leads , plugs , both lamda sensors and cats and has also had both cyl heads removed and reconned . Still running like a box of spanners and causing off side cat to glow red hot ( original cat and lambda sensor had already been melted ) . Long story short , I returned to the vehicle and carried out "reset adaptions " with my old Launch X431 , HEY PRESTO , problem solved , so thank you Bison and Craig from MDP Landrover who was excellent on the phone . Forgot to say , vehicle had a gas conversion which we ripped off which did'nt solve the problem but I suspect caused it ( see post from eighteenavee )

Got the same problem, misfires only just started came on over about 30 miles cruising at 62.5 miles per hour.. French petrol. 1999 P38 4.6 HSE 23000 miles on dash.
Fingers crossed it's just a reset as mentioned above, Very useful, at least some solutions...... hopefully. Will return after a nanocom session, best regards to all !

on my Green rovy;
1 Did the nanocom reset, improved the situation but not completely. I have changed the plugs, changed the MAF, still 'hunting' and misfiring, next week will change the purge valve. See what that gives. Tried running with the petrol cap loose to release vacuum but no improvements. So still to do: plug leads and purge valve. after that who knows.
Fingers crossed.
2 On the red rovy 2.5 1997 dse, problems on the EAS, blinks but wont raise.