[tirwin]

CIS is temperature sensitive. It’s pretty common to have starting differences between cold and warm seasons. It tends to be a fine line in setting the pressure to a setting that works well in both. Also depends on how much variation in ambient temps in your location. I would like to hear what Tony says but 1.8 bar at 68°F might be a little lean. Would you say 68° is a fairly typical temp when the problem happens or is it usually colder?

Edit: I just looked at the chart. 1.8 is too low for cold control pressure at 20°C.

Check to make sure you have 12V at the WUR connection. Also take a resistance reading across the WUR terminals. My guess is that on your 2nd attempt your getting to warm start behavior.

Are you sure that warm control pressure maxed at 1 minute? That seems fast and the pressure seems a little low. Not looking at the chart though.

Edit: Your residual pressures are higher than warm control pressure. Suspect you did not wait long to report the correct warm control pressure value. Also residual should be same or nearly the same at shutoff. It should not increase. RP should slowly drop off over time. An engine that has rapid drop in residual pressure will have a hard time with warm starts. Doesn’t sound like your problem. It’s doubtful your RP was increasing over time. That would be unusual and suspect if it is realky the case.

Someone else already asked but is it US or Euro. Need to know that too.

Tony will no doubt ask you to verify that you have the correct WUR for your car. Please check the part number. It is amazing how many people have had a shop work on their car and the wrong (incompatible) parts were used. Not saying that happened in your case but it would be a good idea to rule it out.