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[chrisr]

No, I don’t think it’s a previously discussed car, no it has been buggered about with and it had a new manifold a couple of years ago.

[Doctor Gollum]

No, I don’t think it’s a previously discussed car, no it has been buggered about with and it had a new manifold a couple of years ago.

This thread started off about the rough running of two different cars.

Are you saying that this is a third car

I would consider a new manifold buggering about with.

It’s hard enough to diagnose issues remotely without having each question added into the last one about different cars.

[chrisr]

It was running fine both with the previous cracked manifold and with the new one, that’s not the issue. I believe it was you who suggested a coolant sensor problem so I bought a new one but couldn’t locate where it went. I wasn’t aware of two other cars with the same problem. Sorry to have disturbed you, I’ll try somewhere else.

[Doctor Gollum]

Not trying to be unhelpful.

Apologies, I think I may have confused this car with the two of another Chris, both four cylinder cars running rough.

I only realised this when I went to link to that thread

[Doctor Gollum]

So, from the beginning...

Did you find any split or blocked breather hoses?

Any codes to suggest that the ECU coolant temp is not accurate?

Presumably the exhaust manifold was the one replaced?

Any evidence of an exhaust leak? Erroneous O2 readings when cold from the live data?

[chrisr]

I had the inlet manifold and throttle body gaskets replaced and all is now well. Still couldn’t find where the coolant sensor goes!

[Doctor Gollum]

You couldn't or the place that did the work couldn't locate either coolant sensors

Both sensors are at the back of the head and don't require removing anything to access them.

[chrisr]

I couldn’t locate one, let alone two! But then it wasn’t that anyway….

[Doctor Gollum]

I couldn’t locate one, let alone two! But then it wasn’t that anyway….

https://www.proxyparts.com/car-parts-stock/information/engine-code/y22se/part/cylinder-head/partid/15399511/

The lump on the back of the head is the coolant 'bridge' The black plug is the ECU coolant temperature sensor. The dash temp sender has either a spade or button terminal and should be close by.