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Interesting one this and hopefully find an interesting answer. Doesn't start sometimes, other times it starts ok and then performs its function. Maybe the RAC approved garage found an answer but it wasn't the actual EGR valve, does this EGR have wires to it and electronics. Is this a wiring fault problem. Doesn't sound like Fuel related as of air in fuel but maybe has more than one fault. Was thinking of a sensor fault where crank sensor would shut engine down and not leave fault code but it runs ok at times for many miles. Then there's the Boost/temp sensor, shut down yes, leave code, well sometimes. If it goes into limp mode on booting it code P0235 or likes is left. But noticed on mine when boost sensor totally lost it and shut down happened there was no code, as like crank sensor. But that EGR system needs checked and wiring verified.

Gordy is right, look for the simple answers first. Garage nearby couldn't find a no start fault on a Vauxhall. Sold the owner another car. I bet it was nothing.

I'm with you @@gordy - hear it far too often nowadays. All the technology but no old school skills or brains. Open the bugger up and find out, or take out the injectors or glow plugs and do a compression test, or SOMETHING!!!!!! My van had no fault codes but drove like a sack of poo from cold..... Nowt wrong with it then obviously!! Go on then drive it I dared them - oh yes it's awful isn't it - bloody hell yes!!! So an older chap, who used to work on cars in the good old days of points, distributors, condensers etc, said - "egr valve that Nev, gummed up and sticking" and it was. Ruddy new one needed "coding in" to a Renault Master. My line of work is heating and gas engineer, and the number of times I come across the phrase "wouldn't you be better off with a new one" pee's me right off. No they wouldn't - ruddy fix the damn thing, or don't claim you can repair them. Worst one recently was a conventional boiler supposedly knackered, young couple recently moved in, but when I go round it's still ok for hot water. So as I said to the young lady - well it's still working then isn't it, it's not dead. If it gets the water hot the boiler is fine. Two people had happily quoted her a new one. I had a look round at the system as to why the heating wasn't on, and eventually found the camouflaged thermostat, painted over, turned it up and hey what do you know hot rads 5 minutes later. Rocket scientist I must be. So much to the pleasure of my little girls I put a Bob the Builder sticker on my van, with the slogan "Can We Fix It? - Probably!" Anyway sorry I went off topic too. So commisserations woodie and Andy. Mind you I still have my 2002 3.3 going green on the drive behind my van, my old post from last year has just been brought up by someone else, and slightly new test info, so it may breath life again, yeah right.