Hi All,

I've had the car in for a new front diff and investigation on a misfire when cold. Front diff straight forward but miss fire is causing more head aches.

Test has said exhaust gas in coolant and initial diagnosis was cracked head or head gasket. Now thoughts (as cracked head and head gasket are apparently very rare) are rusted EGRs leaking into cooling system. When I bought the car I was told the EGRs had been blanked. Next suggested course of action is blank the cooling running through the ERGs which will hopefully fix problem. Advise is that this is the current best guess on problem but won't know unit job done. What are peoples thoughts on this?

On misfire, initial thoughts were coolant in cylinder (from head gasket or cracked head) causing issue until heat burns off the moisture. This has damaged an injector or two. Not sure now if that remains a probability based on EGR diagnosis above. Also not sure if a damage injector would work OK once car was warm. Further, whether it's one or two injectors seems a bit vague. This doen't give me a great deal of confidence.

What are peoples advice on the above?

Need to get fixed but not confident what to do.

NB: When warm, the car runs perfectly.

Thanks in advance for any thoughts.