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[Doctor Gollum]

Loom fault will either be the trigger wire between the ecu and the coil pack plug or a busted plug not fitting the coil pack correctly... Easily crushed when fitting the coil pack if not paying attention. 

Coolant has more chance of being the radiator than the head... But if it's not hitting the floor, it is evaporating off. Don't ignore the header tank, cracks around the cap neck can look like moulding seams

Hth

[tunnie]

Was very careful refitting everything, ordered a replacement new cap. Fingers crossed it’s that.

[VXL V6]

Can you smell coolant when it's hot / cooling down? Had to replace radiators in a couple of Omegas I've had because of fine cracks at the very top of the n/s plastic shroud - as it gets worse you see it dripping by the drain plug that gives the impression that the drain plug is weeping.

[dave the builder]

you could rig up a simple pressure test rig with a foot pump and some hose clamps and hose 

[Nick W]

you could rig up a simple pressure test rig with a foot pump and some hose clamps and hose 

Get a mountain bike or motor bike inner tube, cut it opposite the valve and attach to the cooling system in place of the driver's side radiator hose. Pressurise to 1bar, and go for a long lunch. It should hold pressure for that long. You can check used radiators this way, although it's pointless when a new one is <£100

[tunnie]

Can you smell coolant when it's hot / cooling down? Had to replace radiators in a couple of Omegas I've had because of fine cracks at the very top of the n/s plastic shroud - as it gets worse you see it dripping by the drain plug that gives the impression that the drain plug is weeping.

Yes! There is a general whiff of coolant when hot and as I get out of the car. I’ll have a look around that area, so you have to take plastic top trim off to see it?

you could rig up a simple pressure test rig with a foot pump and some hose clamps and hose 

It’s been pressure tested are Serek’s = All good

[VXL V6]

Yes trims off a decent torch, difficult to see clearly but may see traces / stains of dried up coolant in that area.

[dave the builder]

you could rig up a simple pressure test rig with a foot pump and some hose clamps and hose 

It’s been pressure tested are Serek’s = All good

coolant is going somewhere , so not all good 

you could rig up a simple pressure test rig with a foot pump and some hose clamps and hose 

Get a mountain bike or motor bike inner tube, cut it opposite the valve and attach to the cooling system in place of the driver's side radiator hose. Pressurise to 1bar, and go for a long lunch. It should hold pressure for that long. You can check used radiators this way, although it's pointless when a new one is <£100

I was thinking remove and blank the small overflow/return at the expansion tank ,then that leaves a small bore pipe to attach pump too ,easy to get at

[tunnie]

Something like this, to track leak?

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F230723938073

[TheBoy]

Remove plenum (but keep its coolant lines in tack. Remove intake. Pressure cooling system to about 8psi. Visually look for leaks in valley, rad sides, coolant bottle, and block to head areas.


Misfire - jump in it tomorrow. Flow throttle to full kickdown, and crank - it shouldn't start. Crank for a good 5s, and repeat. Then start normally. Improvement? If so, replace injector.

[tunnie]

Will try pedal start trick, in Wales until Sunday though in the Zafira.

I have no means to pressure test coolant system. 

[Doctor Gollum]

Will try pedal start trick, in Wales until Sunday though in the Zafira.

I have no means to pressure test coolant system. 

Do you own a bicycle pump?

[Nick W]

Will try pedal start trick, in Wales until Sunday though in the Zafira.

I have no means to pressure test coolant system. 

Do you own a bicycle pump?

that, a cheap bike inner tube and a couple of hose clamps.
Or a screw a replacement Schrader metal valve into a new(that doesn't leak) expansion cap and pressurise using your bike pump, less than 1bar is enough.
You could buy a test set, but you'll probably have to bodge an adapter so it's not worth the expense for the use you'll get.

[tunnie]

I would have to buy all that, plus no time to do it.

Just realised though, I’ve not checked the passenger footwell yet to see if that’s wet.

[Nick W]

I would have to buy all that, plus no time to do it.

Oh.


Back to guessing then.


Good luck