Megane, engine cranks but not doesn't start sometimes

Tiny
RIZZARDI
  • MEMBER
  • 2003 RENAULT MEGANE
  • 58,000 MILES
My Megane does not start sometimes, the engine try to start, it cranks but doesn't start, does not matter if it is hot or cold, I've had to push the car to start, I can drive the car for 1, 2 days without problem and then it just does not star sometimes. TDC sensor and camshaft sensor has been replaced, the mechanic cannot find the problem, could anyone help me?
Monday, July 23rd, 2012 AT 12:00 AM

6 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
CHECK TO SEE IF IT IS MISSING SPARK OR FUEL WHEN IT DOESN'T START. ONE WILL BE MISSING AND THEN YOU WILL KNOW WHERE TO LOOK.
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Monday, July 23rd, 2012 AT 2:06 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Also refer to this walk thru link: https://www.2carpros.com/articles/car-cranks-but-wont-start
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Monday, July 23rd, 2012 AT 8:42 AM
Tiny
RIZZARDI
  • MEMBER
  • 2 POSTS
What is the easiest way to check for that? I've spent days in two garage and they could not find the problem.
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Monday, July 23rd, 2012 AT 8:43 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
I suggest you check for a snapping blue spark and fuel pressure if its within specs as recommended earlier and report back your findings-this is basic stuffs they should be able to find out what's wrong
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Monday, July 23rd, 2012 AT 8:50 AM
Tiny
KOMEN TAR
  • MEMBER
  • 1 POST
@RIZZARDI Do you remember what was the problem for car not starting and how you fixed it? I have similar problem on my Megane. Thanks
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Wednesday, February 22nd, 2023 AT 4:05 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
Hi,

We never received a final response from the prior individual. However, an engine needs 4 things to run, fuel, compression, correct ignition timing, and spark at the plugs.

Try this and let me know the results. See if the engine starts if you use starting fluid. If it does and then stalls, we will know it is fuel related. If there is no change, suspect ignition spark to the engine.

Here is a link explaining how to check for an ignition spark:

https://www.2carpros.com/articles/how-to-check-for-ignition-spark

Let me know what you find. Also, if possible, record it cranking and upload it for me to hear. If there is an issue with timing or compression, I should be able to tell.

Take care,

Joe
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Thursday, February 23rd, 2023 AT 5:50 PM

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