Hi, I have a 1.6 combo/doblo and it also has a strange lumpy idle for a number of seconds when starting the van. Otherwise the engine has been fine, and there's no engine lights or error codes. I did research it before and somewhere I found someone saying it is just a safety feature that's programmed into the bcm, so that the engine can't be over-revved when first started to avoid engine damage/allow oil chance to circulate. If my engine is warm, it seems to be much quicker or not even noticeable. On especially cold mornings I turn the key to first position to activate glow plugs and wait for the glow plug light to extinguish, then turn off and remove the key, then repeat before actually turning over the engine. I've found this seems to help reduce the length of time the engine idles strange.
We have spoken about this before and it is not a problem I have noticed even with frost on the ground though weather is very mild around here generally. I have never needed to do the old trick of turning ignition off and on again to give a bit more heater plug, though I have had to on older vehicles many years ago.
Interested in any more confirmation you find re "it is just a safety feature that's programmed into the bcm," bit , I haven't heard of it, the only thing I found on a car years ago (maybe a Rover Maestro) that I fitted a clutch to and dislodged the oil pressure switch wire which prevented it from starting until refitted. So I suppose it is possible that the ECU or BCM is programmed to wait for a reading from some sensor on cranking before allowing the engine to fire up, though not sure if that would relate to not being able to rev up.
Recently after a run of around 20 miles then stopped for several hours and restarted I had a glow plug warning on the dashboard, it made no difference to the normal quick starting.
Later I checked with a cheap Launch diagnostic tool and no errors were showing, however I tested the relay and then the injector plugs and found some faulty, I then replaced the set with new Bosch ones with no further messages.
Just in case you try to test the injectors across a battery, don't as you will find they are rated at 4.4 volts I think, which will destroy them .
I did that trick years ago on a Bedford Midi with the Isuzi engine and had to buy a set.
Strangely when I put a meter on the relay it read 10 volts for a second or so before going to the correct voltage. If you go back some time in my other threads there is a bit about it and the wiring plugs etc.
