2000 Renault Scenic engine stop offten in summer

HUDACSKOA

MEMBER
2000 RENAULT SCENIC
4 CYL
2WD
MANUAL
98,000 MILES

Hi,

I have this car and I experience every summer the same problem. When it is a really hot about 32C the car, after driving some miles, automaticly reduce the fuel injection and gradually stop the motor. After waiting some second you can restart the engine and start driving, but the problem come up again and again even the more you try again the more it comes earlier. And at the end you just have to wait on the side of the road while the temreture drop under about 25C. This can be very anoying.

about three mechanics had checked the car and they could not found anything and have no idea.

i know it is very wierd problem, but maybe someone can help me here.

thank you

3 Replies

JAMES W.

MECHANIC
2,395 POSTS

When the stalling condition exists, does the car gradually lose power no matter how you push the throttle until it comes to a stop? While doing this, does it kick or buck a lot? It sounds like a good old fashioned case of "vapor lock". The answers to the above questions will help narrow it down. Please advise.

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Wednesday, December 31st, 2008 AT 8:29 PM

HUDACSKOA

MEMBER
2 POSTS

Yes, there is usually some buck, when you feel loosing power no matter how you push the throttle. After you can drive with less power a little bit but at the end the motor just stops. I was thinking maybe the electronic protection against motor over-speed has broken and it limits it too early.

Maybe you are right but WHY is it just when it is hot? Why more often when the motor is hotter? And it started this when it was just only 2 years old.

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Wednesday, December 31st, 2008 AT 9:32 PM

JAMES W.

MECHANIC
2,395 POSTS

The over speed protection will usually just warn you of over speed. It won't hold the car back and surely won't stall it. If your talking about "over rev" protection, that will only let you rev up the motor to a certain rpm, but it still won't stall the car.
Why does the car do this only when it's hot out? The hotter the air is outside, the hotter it is under the hood. If you pull 100 degree air through a 200 degree radiator, the underhood air temp is approximately 150 to 175 degrees. 40 degree air through a 200 degree radiator is approximately 90 to 110 degrees.I don't remember at what temp gas boils, but I think it's around 145 degrees. I looked to see if there were any TSB's out on your problem, but Renault isn't in my system. To prove my theory you could insulate the underhood fuel lines and fuel rail with foam rubber or anything suitable and see what happens.

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Wednesday, December 31st, 2008 AT 10:21 PM