2001 Renault Megane Engine won't start when hot

Tiny
BOAZ LUZ
  • MEMBER
  • 2001 RENAULT MEGANE
  • 4 CYL
  • FWD
  • MANUAL
  • 110,000 MILES
Intermittently (about once a week) I have a difficulty starting the engine. It tends to be after a long stop and go driving but also after normal driving when the engine is hot. A typical situation is that I cannot start the engine but after a while (10-20 min) the problem disappears and the engine starts easily. I never had a problem starting the engine in the morning. Under normal driving conditions the car runs great with excellent performance and gas mileage. My mechanic does not find any codes indicating a problem. Any clues will be appreciated.
Wednesday, April 23rd, 2008 AT 3:51 AM

4 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Get a carbuerator cleaner and next time it refuses start do below -and tell me what happened.

Get a carb cleaner and spray into the carb or the throttle body on an EFI. Did it start and die? If not disconnect a sparkplug wire or 2 and ground it to the engine -have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel problem, check the fuel pressure to rule out the fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light.

Fuel pump and Injector/s checks out-start checking the ignition system-power to coil, coil/s itself, distributor pick-up, control module, Cam and Crankshaft sensors.

If both fuel and spark is present-check the valve and ignition timing, this will lead you to problems with compression and valves opening and closing at the wrong time
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Wednesday, April 23rd, 2008 AT 4:28 AM
Tiny
TINA MAXIM
  • MEMBER
  • 1 POST
Hi there can you tell me how you got on with your fault? I to have the same problem with my Megane won't start when hot.

Intermittently (about once a week) I have a difficulty starting the engine. It tends to be after a long stop and go driving but also after normal driving when the engine is hot. A typical situation is that I cannot start the engine but after a while (10-20 min) the problem disappears and the engine starts easily. I never had a problem starting the engine in the morning. Under normal driving conditions the car runs great with excellent performance and gas mileage. My mechanic does not find any codes indicating a problem. Any clues will be appreciated.[/Quote]
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Saturday, May 17th, 2008 AT 11:14 AM
Tiny
BOAZ LUZ
  • MEMBER
  • 3 POSTS
I am sorry but since posting my question the problem has never recurred so I obviously I haven't done any tests

[/quote]
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Saturday, May 17th, 2008 AT 3:22 PM
Tiny
BOAZ LUZ
  • MEMBER
  • 3 POSTS
Problem solved!
Last time when the car did not start I checked as suggested and found that there was no spark. Searching for the problem I discovered a faulty connection on the crankshaft position sensor. After fixing it the problem was gone.
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Monday, June 9th, 2008 AT 11:55 AM

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