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Renault scenic keeps cutting out

11K views 4 replies 4 participants last post by  Lagdti 
#1 ·
Hi
I have a 1999 Renault scenic megane. A couple of days ago the engine died on me. I got it going again but it cut out again after a couple of hundred yards and would not start again.
A lad from a near by garage was walking past and had a look and said my manifold was cracked. He said it would start again when the engine had cooled down which it did.
I have used the car a few times since and it has been ok as long as it doesn't warm up. As soon as it warms up the engine dies and I have to wait for it to cool down.
I have had a look at the manifold and there are two cracks on it I can't see how far or bad they are at the back.
My question is could these cracks be causing the problem or is it something worse. Sorry for being so long winded
 
#2 ·
sounds just like my scenic used to, it was overfueling, due to a faulty engine fuel injector tempreture sensor, it is located in the thermostat housing, and on my model its the lower of the 2 sensors, 1 is for the electric fan that cools the motor, the other is to control the mixture in the fuel injection, if its faulty, it keeps telling the ecu its cold and needs more fuel, so it ends up flooding the motor and stalling, and hard to restart,
 
#3 ·
Manifold? Could it to be with engine preasure? Theres a car behind my house that sounds like a tractor, he asked me to have a look because he had seen me working on another car and i could feel a blowling under the manifold housing and i eventually figured which pipe the air was coming from.

Thats an old shape astra though where as your car is newer :D

Either way i hope you get the car sorted soon :D
 
#5 ·
It COULD be related to the cracked manifold,it depends on how bad the blow is to be honest.If the exhaust is leaking,not only will exhaust gases leak out,air will be drawn in,this will effect how the Lambda sensor reads and it will think the mixture is lean and add more fuel to the point where the engine can't cope and cuts out due to over fueling.It's an unusual scenario but I have seen it a couple of times.When the engine is cold the readings from the Lambda sensor are ignored,so that would also match your problem.

More commonly the coolant temperature sensor for the ECU plays up (as mentioned before) and it would be worth having the live data from the sensor checked.Having said that,the manifold will need to be sorted anyway so I'd try and source a decent second hand one.
 
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