After my trackday towards the end of last year i had two issues to fix:
- 1. The missing edges of blades from my turbo.
2. Car not idling at all and cutting out.
I managed to source a replacement turbo over Christmas but didn't want to start stripping things down to replace until i had resolved the idling issue. I see too many threads on forums where people go wading in changing this that and the other and compounding their problems.
Knowing my issue was most likely a boost leak (i did double check static and ignition timing just in case things had slipped) today i decided to pressurise the intake tract and i found a leak at the back of the intake manifold.
On the back of the intake manifold is a second vacuum port that normally has a barb and a blanking cap on it, but in my case this had blown right out.
You can see in the pic below that i have temporarily blocked this with a bolt to check.
Once blocked idling returned to normal
So posting this thread in the hope that it may help somebody else in the future.
Tomorrow i will start stripping down to replace the turbo......