My 2004 Terrano 2.7 would not start a couple of weeks ago and AA man said problems with glow plug relay working intermittently. Bought new relay and started it up twice since (not been a run though as mainly used for towing) then this morning, a slight "pop" from wing area and it will not start again. Waiting for AA man and expecting him to say that the £57 relay has had it. Any suggestions as to what the problem may be and can I get a relay cheaper than from Nissan? I did have a water leak a few weeks ago with a slow drip running down accelerator pedal. This issue now ok and did not affect car running at the time. Husband wants me to sell it but I wouldn't even think of it.