davellew Posted March 31, 2013 Report Posted March 31, 2013 Hi Thanks for looking and i really would appreciate any help you can give me on this. I have recently fitted a replacement engine (45,000 miler) to my Galaxy.The original engine was great until it dropped a valve. The new engine starts first time every time from cold and runs perfectly. The problem comes once the engine is hot and then it wont restart until it cool right down. Once cool it fires straight away. The only fault code showing is "low rail pressure". As i still had the original engine, I have swapped the rail pressure sensor, the high pressure pump, the crankshaft sensor and the camshaft sensor. Unfortunately I still have the same problem. My feeling is that I have a connection or cable failing when hot but don't really know where to start looking. Any advice you can give on this would be most appreciated. Thanks very much. Dave Quote
dlt1617 Posted March 31, 2013 Report Posted March 31, 2013 Hi Dave welcome to the forum, you've mentioned your problem but not what vehicle/model and year it refers to! Everybody does it ! Best wishes Dave Quote
davellew Posted March 31, 2013 Author Report Posted March 31, 2013 Hi. Sorry about that. It's a 2.0L TDCi 140 6 speed and it has the Siemens fuel system. It would be great if you had some fresh ideas. Dave Quote
dlt1617 Posted March 31, 2013 Report Posted March 31, 2013 Hi Dave the later Galaxys are not my strong point but some one may come in with a bettter/more accurate suggestion.When I worked for BMW there were two causes of low rail pressure (other than the sensor) one was that one injector was leaking so it dropped the pressure across the whole rail, the other was due to a pre supply pump fault. The pre supply pump was fitted in the fuel line from the tank to the high pressure pump and ran constantly with the ignition on. It could be that the pump fails when hot or it could be I'm talking out of my bottom! Best wishes Dave Quote
davellew Posted March 31, 2013 Author Report Posted March 31, 2013 Hi Dave, Please excuse my ignorance but if an injector were leaking causing a pressure loss wouldn't this allow air into the system and then cause cold start problems. I'll check out the low pressure pump tomorrow.Thanks for your input Dave Quote
davellew Posted April 1, 2013 Author Report Posted April 1, 2013 Thanks, new to this so dont know my way around yet !! Quote
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.