My car has been a bit lumpy when cold since I’ve had it. Normally, once starting it and having left the driveway it’s a while before it returns to idle as we drive down the lanes, into the local village and a few mins later onto the dual carriageway.

This evening I jumped in the car and noticed I hadn’t locked the workshop so left it idling and by the time I got back in it the lumpiness had caused there to be a nice orange glow on the dashboard from the engine management light.

When reading the codes with the IID tool I saw this:

Click image to enlarge

Click image to enlarge

Could possibly be the petrol your using mate I guess. I've noticed that with mine. When I've used the regular e10 petrol either on the bike or in the range, in the cold they seem to start up slightly lumpy but after a short while it seems too sort itself out but soon as they run on e5 they start up with no issues. Maybe try some octane booster

If it was the man sensor then the faults would be all over the cylinders and not on one side I'm guessing

Allen

Meant to add it’s got E5 in the petrol tank and LPG.

It switches to LPG once the coolant temp reaches around 40 degrees and it’s the same when it switches fuel so I’m not convinced it’s a fuelling fault.

It’s got Flashlube on the LPG system but am kinda wondering if it could be burnt valve seats as it’s been fitted to it for years looking at the service history. Would like to exhaust everything else before taking the heads off though!

David. 2002 4.6 Vogue SE - Alveston Red with Lightstone Leather
2007 Range Rover Supercharged in Java Black with Ivory Leather
2012 Range Rover 5.0 SC Autobiography in Indus Silver with Jet/Ivory Interior
2012 Range Rover 4.4 TDV8 Autobiography in Baltic Blue with Sand Interior

Pretty much elimates the fuel if its doing it on lpg. Tried cleaning the maf with some electrical cleaner?

Allen

I did just after I got it when I was going through everything else on it. Certainly haven’t done it recently so will give it another go  2002 4.6 Vogue SE - Alveston Red with Lightstone Leather
2007 Range Rover Supercharged in Java Black with Ivory Leather
2012 Range Rover 5.0 SC Autobiography in Indus Silver with Jet/Ivory Interior
2012 Range Rover 4.4 TDV8 Autobiography in Baltic Blue with Sand Interior

If that don't work, pm me your home address and I'll send my one up to you so you can test it at least and see if it works.

Mines off road atm so can't use it anyway

Allen

Thanks Allen

I’ll do a bit more checking and see what I can find.

David. 2002 4.6 Vogue SE - Alveston Red with Lightstone Leather
2007 Range Rover Supercharged in Java Black with Ivory Leather
2012 Range Rover 5.0 SC Autobiography in Indus Silver with Jet/Ivory Interior
2012 Range Rover 4.4 TDV8 Autobiography in Baltic Blue with Sand Interior

same as allen i use ipa in a spray bottle and then drop it on a heater or rad to dry i fitted a k and n filter so do mine every month to clear away any oil that may come from the air filter new vehicle purchase
2007 supercharged 4.2 java black .sand leather vogue se trim
previous cars .
range rover classic 200 tdi
discovery 1 200 tdi
freelander 2 2008 hse
discovery 1 300 tdi
p38 4.0 ltr man r380 ex royal support vehicle on v5c
discovery td5 man off roader

Unplugging the MAF will cause the car to run in limp mode but it should stop it doing anything that would be MAF related I’d have thought.

I might give that a go this afternoon.

David. 2002 4.6 Vogue SE - Alveston Red with Lightstone Leather
2007 Range Rover Supercharged in Java Black with Ivory Leather
2012 Range Rover 5.0 SC Autobiography in Indus Silver with Jet/Ivory Interior
2012 Range Rover 4.4 TDV8 Autobiography in Baltic Blue with Sand Interior

Try clearing the fault codes, disconnect the maf, then start up as it should throw up it's now got a maf issue so hopefully the other ones won't return.

I'm not particularly clued up with how the lpg works in the engine bay but if the fuel/lpg runs through the same injectors could it possibly be some dirty injectors.

The LPG has its own injectors and everything so there’s nothing shared between the 2 fuels which is handy for fault finding.

Will try and get to it today in between showers.

David. 2002 4.6 Vogue SE - Alveston Red with Lightstone Leather
2007 Range Rover Supercharged in Java Black with Ivory Leather
2012 Range Rover 5.0 SC Autobiography in Indus Silver with Jet/Ivory Interior
2012 Range Rover 4.4 TDV8 Autobiography in Baltic Blue with Sand Interior

Mine had a similar misfire on starting when it was over filling on valve saver fluid, something to look at.

Also if I unplug the maf sensor it stalls immediately

2007 sc

That’s an interesting point on the valve saver fluid.

How did you diagnose that?

David. 2002 4.6 Vogue SE - Alveston Red with Lightstone Leather
2007 Range Rover Supercharged in Java Black with Ivory Leather
2012 Range Rover 5.0 SC Autobiography in Indus Silver with Jet/Ivory Interior
2012 Range Rover 4.4 TDV8 Autobiography in Baltic Blue with Sand Interior

Just noticed that I'd used a lot more than usual and it was over dosing by a factor of 3, I think it was just getting sucked in on cold start up as it was fine if the engine was still hot. Since I've recalibrated its got no misfires on starting. (its just a drip feed system under vacuum with the inlet after the throttle butterfly, I have a slipstream of petrol above 2900rpm, done 60k on lpg and all healthy)

I think the system on mine is pumped rather then vacuum fed. There’s a little unit mounted to the front of the battery box next to the reservoir for it.

I need to get this sorted ASAP now. Tonight when leaving my folks I had the EML Flashing and the “Engine Performance Reduced” message on the dash. It was running horribly.

IID tool showed misfires on every cylinder bar cylinders 4 and 7.

Click image to enlarge

Click image to enlarge