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Mazda Premacy hot starting problem - shamg11
Our Premacy (1.8l petrol, 2000, 35,000 miles) has an intermittent hot starting / rough idle / power loss problem.

It starts OK first thing (i.e. cold) but after warming up on a run and then stopping, it won't re-start (it just cranks over and doesn't catch). After waiting 10 mins it is OK again. the lumpy idle again occurs when warm and the sudden power loss (2 cylinders?) the same.

The dealer said it might be the immobiliser (the non-start) but there is no stored code and the logic does not fit. He then said it might be the coil?

I have a theory it may be the injectors or something to do with the fuel injection system. It has got noticeably worse since the beginning of September when the 'winter petrol' was introduced to the forecourts. Put some petrol and fuel injector cleaner in on Saturday and it seems a little better already.

Any ideas?