yep the cap is vital , it keeps the required pressure in the system which is usually printed on the cap , it raises the water / coolants boiling point , and stops it evaporating off too.
yep , give it a trySo try the old cap with a new ring do you reckon? This on the basis the new cap might be wrong for the old bottle.
I've just clicked Buy on this:
https://www.ebay.co.uk/itm/New-Universal-Radiator-Pressure-Tester-Cooling-System-Head-Gasket-Leak-Detector/402034558746?
The pump could be worn out -or upset by modern fuel? As might any in-tank " hoses - has them fail in the Lancia tank before - swelled up and failed - obviously not as rated for immersion as the seller claimed!
Does it get used regularly? It it sits for a month or two, might simply be fuel going "off" - although all mine will still run on fuel a few years old (meaning its pre-E10).SWMBO does like a bit of cheap fuel and will only fill up with that E10 crap at the supermarket. I regularly give it a shot of Reddex and occasionally treat it to a tank of Shell V-Power Plus E5 which is all I put in my Mondeo.
If it was just fuel "gone off" it would do it all the time.Holy thread ressurection!
SWMBO's now 22 year old Pug 206 (1.4i petrol). Suffering from stalling occasionally. Likes to do it at the brow of a hill as you stop, at a junction, roundabout etc. Not always though.
When its playing up, according to SWMBO, "it's chuggy and gutless, had to come up so and so hill in first". Other times it's like a little racing car. She can go somewhere and it's bad, park up, do whatever and coming back it's cleared and runs sweet. Presume that rules out the idle control unit?
It's had a new fuel filter and 4 new injectors.
Had a suggestion of crap in the tank?
Any thought? Cheers.
If it was just fuel "gone off" it would do it all the time.
If it was water in the fuel it would misfire on light load, clearing on full throttle (you have to assume little amounts of water here, but a lot would just stop it).
I've seen pug injectors failing many times - they must be unique rubbish, its not common to other cars?
Idle control unit doesn't affect open throttle performance - unless it goes into limp mode?
Blocked cat would clear as soon as you lift off the throttle, but mabe worth giving it a shake?
So you have the temp sensor, crank pickup sensor, throttle sensor, vacuum sensor (in the ecu?), and is there an airflow sensor?
Is there a way of reading the obd data, maybe buy a cheap reader and plug it in?
Does it get used regularly? It it sits for a month or two, might simply be fuel going "off" - although all mine will still run on fuel a few years old (meaning its pre-E10).
Can you get a look into the fuel tank - the bit about struggling up hills has me wondering about water?This is a 2000 car, pre plex or something like that. Even my BiLs top brand reader (he has a few) struggled and gave limited diagnostics, even then nothing related.
List of changed bits is endless but immediately then fuel filter, all 4 injectors, the coolant sensor next to the stat. Coil pack too. There is a MAF, all I've done with that is clean it.
that was my "off" - modern E10 and the phase separation sinking to the bottom. But regular sue means its shaken up and regularly refilled with fresh fuel.Can you get a look into the fuel tank - the bit about struggling up hills has me wondering about water?
Once its in there, theres only one way out - through the engine, it won't evaporate...
There was water in petrol at various filling stations before e10. I had it 6 years ago, just a niggling misfire. When I took the car apart to fit the gas conversion kit I realised there was water in the fuel rail. I looked in the tank - about half a liter rolling around in there...Tbf it's been playing pre the widespread change to E10. Maybe worse now though, of late.