Engine cut outs
 

Hi,

I've got a MK1 Focus and have got an issue with it at the moment.

The speedo would be stuck at 0 and the car would cut out when coming to lights/slowing down.

Read around online and the VSS seemed to be the issue for people.

I've now got a new VSS and had it replaced but car still cuts out.

Dug a bit deeper on several forums and the next port of call seems to be the ICV that could need a clean/replace?

Any ideas on if this would be it and/or anything else before I spend anymore on this at all?

Maybe useful info:
I've got a DTC code saying battery output is low. (Brand new battery). and had the alternator checked at the garage and thats coming back fine.

Many thanks in advanced!

Did the new VSS fix the speedo?

Yup, the Speedo has been okay since being replaced earlier this week.

What battery is fitted? It must be a silver calcium, a lead acid will screw with the smart charge system and give you errors.

It certainly sounds like a problem with the ISCV or an air leak. Have a good look around for any vacuum hoses that have splits or become dislodged. Spray some carb cleaner around them with the engine idling, if the engine note changes then you have found your leak.

Cleaning the ISCV rarely works, I would probably replace it with new.

i have the same car and same symptoms.. for the life of me i cant get the bloody pin out holding the sensor in :( hoping changing it will fix it...not too sure after your post but mine only does it intermittently and when the speedo dies..(cuts out when stopping )