I now have a new theory having had a couple of days without being able to get on the forum. My theory is that there are a combination of factors at play here. 1: I reckon the starter is weak 2: I think there may be one or more injectors spilling excessively - I have not yet tested this though and 3: despite all my previous protestations to the contrary, the battery aint great.
After opening the doors and boot but not switching anything on, connected up, the battery is reading around 12.2v on average, droping to about 10.4v when cranking. This is after having driven for 45 minutes coming home from work.
The old battery, which lives in the boot as a booster that will usually start it if the temp is below 65 degrees, sits at 12.66v but is only 800CCA and 850Ah. It still doesn't start the car.
I have found it surprisingly difficult to find an amps clamp that can do DC and is rated up to 1000A. I am going to try the electrical engineering technicians at work tomorrow and see if they have anything. Can get plenty of AC ones no problem!
When i attach the jump leads to the car, if I leave them for a minute with the DMM connected and wait for the voltage to rise to 12.88v or above, it starts every time. Anything below 12.88v and it just turns over regardless of which battery is connected.
Hopefully there should be a couple of vids attached to this post showing a cold start, hot running, switch off and restart attempt and a hot start attached o the jump leads.
Vids not uploading for some reason, just sticking on "sending request" will keep at it
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