I’ve become the custodian of my late father’s MkII. It hadn’t been getting much use - mostly a yearly drive for it’s MOT test. I’d taken it the last 3 years. The car starts fine, idles around 900rpm, and, historically, I’d drive the 5 miles to the MOT where I’d switch off. Then the mechanic would fire her up and perform the MOT checks. The car would idle throughout the 45 minutes or so. However, it would eventually stall and refuse to restart. It could take a good 10 or 15 mins for it to restart. Battery is good. The car drives fine but I wouldn’t want to leave it idling at traffic lights etc. Longest drive on open road has been about 30 mins.
I really need to get this issue fixed, preferably before next MOT. So, I started the car for the first time in about a year (fuel is at least one year old, maybe two - it could be 95RON or higher). It took a while to start, cranked fine but wouldn’t fired although tried to. After 10 mins it caught and ran fine. I let it run a bit and switched off.
A week later, it started first push of the button, 900rpm idle but after 4 or 5 mins, it dropped idle to around 400 rpm and slightly rough idle there. Red ignition light on the dash glows. I can open throttle and revs climb as expected and ignition light stops glowing. I switched off.
I repeated the above a few days later. and same thing happened. Starts fine, idles around 900rpm then a definite drop to about 400-500 rpm and slightly rough idle.
I’ve had a few suggestions made by mechanics. MOT station felt it was a fueling issue - Might be running rich.
I can let the car idle at 400-500 rpm and wait the 40 mins or so until it cuts out (or take it for a drive and see if it cuts out then - but then I’m stranded) and feel if the coil had become hot - the coil could be the problem.
The fuel? I’ve been told I might need to raise the octane by one person and lower the octane by adding kerosene by another person. I’ve also been told the fuel deteriorates quickly - 6 months or so, so I should probably pump out the fuel and replace with a small amount of new fuel until this issue is fixed.
I’d appreciate if anyone could help me out with this issue. Thanks in advance.