Engine Mechanical problem
2004 Renault Megane 6 cyl Front Wheel Drive Automatic 66000 miles
I have a 2004 Renault Megane 1.6 16V Auto. One day it just struggled to start, and from that day on, when I press the start button, it idle's for about 5 seconds, the stall immediately. After about 4 attempts, it will idle normal, and drive normal, no stalls at lights or anything, work normal until next switch off, and start again. Although it does feel as if it doesnt have the power it used to have. When I start and manage to step on the eccelarater and take off immediately till low revs then stall about 2 times, then fine afterwards. One day also found the battery run flat during the night, and didnt want to start at all the next morning, engine didnt crank. Had to jump start. Went to garage, but they were unable to tell whats wrong. No indication on dash or message on computer. PLEASE HELP!
First try replacing the battery and have the fuel pressure tested ... also add a good fuel cleaner to the tank to clean the lines and injectors !!
April, 21, 2009 AT 4:22 AM
Can the battery be the problem for the idle? Cause most of the time the car start normal, but fail to idle for more then 5 seconds, the cut out. Although only al start up?
Only once or twice found the battery totally flat the next morning, drained overnight.
The garage came with the posibbility that it is the crankshaft or some kind of sensor or something. But they say its most probably the engine itself and have to open up the engine. But they not sure, they charge me an obsurd amount for repair. Dont trust them. Thank you for your reply.
April, 21, 2009 AT 5:58 AM
There is a lot of electrical load on this vehicle and if the battery is getting worn it will cause it to start bad and stall out ... it could be the crank sensor but this should be displaying a fault code ... this sensor takes 20 minutes to replace and is cheaper than having the engine taken apart ...
hope this helps
April, 21, 2009 AT 7:04 AM
Thank you for your advise. The car start normal, with no message on the dash display, all the normal menu's and " NO MESSAGE AVAILABLE" it show.
Then keeps on cutting out for like 4 attempts, then revs stabilizes, and car works normal until next start up.
Can the battery cause loss of power when driving as well in this case? The car also start immediately most of the time, but then after an unstable idle for about 5 seconds, cut out.
How do you test the fuel pressure?
So its definetely an electrical problem, and not mechanical on the motor itself?
I will start with replacing the battery, and keep you posted on how things are going. Thank you very much for your help!
April, 21, 2009 AT 8:00 AM
I took the car to a Battery Centre now, and unfortunately the battery is fine. They tested it.
So any other suggestions? Can it be a fuel problem maby? What about the filters? Or will the next step be the crankshaft sensor? Or any other sensor maby? As I said there are no message on the dash dislay.
I just want to make sure, dont want to go buy the crankshaft sensor if that wont fix the problem.
After changing any sensor or so on the car, do I need to reset the computer or get it reprogrammed?
Please advise on any alternative possibilities!
April, 21, 2009 AT 5:49 PM
I checked the battery as well as the fuel pressure, but both are fine. Any second suggestions please? I also checked the fuses, and added a fuel cleaner to the tank!
April, 21, 2009 AT 7:44 PM
Sorry i have not replied sooner .. time difference and I was at work !! ... try removing and cleaning the crankshaft sensor ... when i said it would display a fault code... I meant on a diagnostic computer .. not on your dash display screen ... but when the sensor start's to get very dirty or worn it can cause intermittent faults which are only stored temporarily and can only be retrieved by diagnostic computer ... remove it and give it a good cleaning .. see if this makes any difference at all ..
April, 26, 2009 AT 3:25 PM
I dont know what to try next. I did test the car with a code reader, no fault code! NOT the battery, NO sensor, tested the fuel pressure, coils, everything is fine. So what can it be? Air filter, feul filter or what? I dont know anymore. Car still cutting out at idle only just after start up, there after fine!