Driving along car stops.fuel,electic spark,movement in engine.ok.car engine sounds freespining,there is no compresion in all cylinders,wont start.mechanic replaced new timing 7months ago with a major service. do i need a recon engine or save my own
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The screech noise is most often a slipping engine drive belt so you might want to check the belt condition and for tightness there.
Unfortunately you have one of the most temperamental brands of cars on the planet there, so you may have to be patient with it at times.
You will best be served by plugging in a diagnostic computer and reading any engine fault codes. Check the condition of the air filter, spark plugs, spark plug high tension leads and fuel filter. Check the engine oil level. If this is low it can cause engine clatter or tapping noises (caused by engine lash adjusters)
Unfortunately there are so many issues with Renaults in general that I dare not guess at any particular other common faults, as there could literally be anything or everything wrong with it. I'm sorry to sound so negative.
no speed sesor can't lets keep it simple first.test your battery before push-starting or jumping it.maybe the battery will hold just enough charge when started often but not after sitting 5 hours,happens alot.
The cylinder head gaskit is on it's way out! had this before! caused by water leeking into the cylider(s) and making the compresion come right up ! remember air /fuel mixture is compressable water is NOT!
This sounds like you have a pressure fault, these gearboxes suffer from pressure solonoid failure, take the car to your dealer and have it scanned, this will show the fault, it is not an expensive job, but if left it can turn into one.