Hi,
I've got a V-reg 1.7 Astra diesel estate that's developed a weird fault; after about 5-6 miles driving from cold (temp gauge about normal - 80C) the tacho reading drops to zero and the engine oil and engine fault icons come on. Also, engine power drops off and on tickover the engine hunts between about normal and almost stalling in about 3 second cycles. Have checked all obvious electrical connections and fuses in case it's something intermittent, but no joy. After cooling down for a couple of hours all goes back to normal until the engine has warmed up again. No sign of overheating if the engine is run after the fault appears.
Sounds like an ECU fault to me, but any ideas out there?
Cheers,
Roger B