Last year my Veccy went into limp home mode 3 times during the summer. I realised that it was happening when I was crawling, or stuck in heavy traffic during the hot months. The temp gauge was only hitting 90-92 degrees, but the spanner would come on and then I'd have to let the car cool down before I could restart without the spanner light being on. I tried cleaning the EGR and although it was crudded up, it didn't help.
Anyway... I was driving to Parsco's house last night to pick up my twin SRi pipes and got stuck in very heavy traffic on the A14. Next thing you know the spanner light is back on. I tried a couple of rolling restarts as the traffic got going again but the temp was still quite high. Unfortunately on the 2nd attempt the EML came on as well as the spanner light.
Once at Parsco's place, I grabbed my FCR and checked for fault codes... DTC P1109 came back. Scott kindly checked the forum for this code and multiple references to the dreaded swirl valve actuator problem came back. Further reading suggested the code also relates to IAT B sensor intermittent? Anyway, I cleared the code and EML using the FCR and let the car cool right down. Then drove back to the Midlands and to work and back today and she's been absolutely fine! I strongly suspect it'll be fine until I'm stuck in traffic again somewhere.
I was running a Caterman (which I removed when I got to Scott's) but I don't think it was anything to do with that due to it happening a few times last year when I didn't have the caterman fitted.
So, does anyone know if engine bay temperature can affect the swirl actuator or is this a red herring? Is the IAT B sensor def. to do with the swirl valve?? I'm assuming the IAT is intake air temperature sensor...? Is there an air intake temperature sensor somewhere that might be faulty - might explain why it is brought on by 'overheating' conditions - or am I just hoping here?