Iv been away all week so the car hasnt been started for a few days....just went to give it a run as it had been sat there most the week, checked all my levels first as i like to do this at least once a week, everything all good...

had the bonnet open when i started it up, and the engine made a bit of a knocking noise for about the first three seconds then it disappeared....i let the car warm up for a bit then drove it up the road and went out for a short drive....all sounded totally normal since throughout the rev range, and tried starting it up a few more times to see if i could hear it again but all seems fine now...

Iv never heard it make this noise before though - however, i have only owned the car for 3 months.

I wondered if this was possibly just due to the fact its started to get a lot colder in the past week, and so could have possibly been a bit of piston slap as the engine was freezing cold when started?

 

Probably just a tad of piston slap due to the cold mate. Not uncommon if it is, and nothing to worry about.

 

Sounds as though the oil had drained out of the heads.When it started up,the oil was circulated back into the heads and pressure was established. Hence the short amount of noise upon start up.If you are using a heavy grade oile,I would switch to something a bit lighter.I run 10/40 in the summer and 5/30 in the winter.Personal preference.But,I have no problems.

 

Thanks, yeh thats what i kinda guessed its most likely to be as went away pretty quickly...

 

Oile? Typo.Oil.

 

This is the other thing i thought could be a possibility due to the fact its only been started once all week...maybe ill dry crank it next time it gets left for a while....

 

Disconnect the injector loom first.If you don't,then the petrol that is being pumped into the cylinders will wash the bores dry.Bad news then mate.

 

would the injectors still fire if the crank sensor isnt connected tho?

 

i would say yes as the crank sensor is for spark

 

I think so.Can't remember the last time I had to do this on a Scooby.I know that other vehicles will fuel when spun regardless of crank sensor signal.Can't guarantee it though mate.You'll know the first time you try it.If it wreeks of petrol,then they are fueling.

 

Ok thanks for the help guys

Just popped out to the car again and started it and it was fine (altho obv still warm from earlier) so hopefully its all good nothing too worry about