VibrantShin Posted January 4 Share Posted January 4 Hello everyone, I have own this Mercedes V-Class W638 for some time; but, in recent months, it has been experiencing sporadic starting issues that no garage has been able to solve. Commence in the mornings It never fails me; nevertheless, after a brief drive and subsequent parking for a while, when I return to start it again... It turns over but fails to ignite. After waiting around thirty minutes and attempting again, it starts immediately. I have replaced the O-rings on the fuel pressure regulator. The crankshaft position sensor Fuel filtration device O-rings on high-pressure gasoline pump I replaced the injectors and cam sensor a few years ago, so I doubt the cam sensor could have malfunctioned that soon. Has anybody else encountered this? I would appreciate any guidance you could provide. Thank you Link to comment Share on other sites More sharing options...
AmericaMonster Posted January 4 Share Posted January 4 Cutoff relay, engine management relay? Link to comment Share on other sites More sharing options...
OmahaKnot Posted January 4 Share Posted January 4 Failure of the Crankshaft Position Sensor may manifest these symptoms. Link to comment Share on other sites More sharing options...
MaxiBroadway Posted January 4 Share Posted January 4 A thought occurred to me as I perused the first post here. Approximately 34 to 35 years ago, I purchased a one-year-old Vauxhall sports vehicle. Initially, it operated exceptionally; but, after a year, attempts to start the vehicle from a warm engine sometimes yielded no response, including no sound when turning the key, if I recall correctly—it was attributed to one of the relays. I was fortunate to visit the main dealer, where the receptionist suggested I try a relay switch, a little oblong item. He provided one for testing, allowing me to return it if ineffective; it resolved the issue. My vehicle was equipped with a petrol engine and electronic fuel injection. Link to comment Share on other sites More sharing options...
AmericaMonster Posted January 4 Share Posted January 4 I had a same situation with a BMW 1.8i. If I persisted for half an hour, it would likely succeed. Link to comment Share on other sites More sharing options...
VibrantShin Posted January 4 Author Share Posted January 4 Does the W638 diesel possess that relay? Link to comment Share on other sites More sharing options...
VibrantShin Posted January 4 Author Share Posted January 4 I modified it, nevertheless the issue persists. This problem occurs just during brief trips; it never arises when the vehicle reaches full temperature and does not manifest during the first cold start, only after a short excursion followed by a period of parking. Link to comment Share on other sites More sharing options...
AmericaMonster Posted January 4 Share Posted January 4 Uncertain, but it must be deactivated in some manner. Link to comment Share on other sites More sharing options...
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