E39 540 Not Starting
Discussion
Hi All,
I am desperately in need of some help
I have a 2002 E39 540i with about 130k.
All has been fine until last week when I went shopping. I came back to the car and it started but was very lumpy, it then died as soon as I took my foot off the throttle. It then refused to start, but cranks fine
After an initial google and some advice my mechanic ran diagnostics on his computer, crank sensor seemed to be fine (could see a reading when cranking the engine) but nothing from either cam sensor. He ordered a new one to see if one was at fault but nothing doing
He seems to be a bit stumped now and is coming back later to look again. Is there anything I can suggest he looks at? Anyone had something similar before?
I am desperately in need of some help
I have a 2002 E39 540i with about 130k.
All has been fine until last week when I went shopping. I came back to the car and it started but was very lumpy, it then died as soon as I took my foot off the throttle. It then refused to start, but cranks fine
After an initial google and some advice my mechanic ran diagnostics on his computer, crank sensor seemed to be fine (could see a reading when cranking the engine) but nothing from either cam sensor. He ordered a new one to see if one was at fault but nothing doing
He seems to be a bit stumped now and is coming back later to look again. Is there anything I can suggest he looks at? Anyone had something similar before?
Have you checked the coil packs? Is the fuel supply system OK? Filled it with diesel recently? Is the battery recent and fully charged?
TBH unless you've a specific fault code, and even then even with one as vague as cam position sensor faults I would be checking the basic requirements of a combustion engine before I started messing with sensors.
TBH unless you've a specific fault code, and even then even with one as vague as cam position sensor faults I would be checking the basic requirements of a combustion engine before I started messing with sensors.
Collectingbrass said:
Have you checked the coil packs? Is the fuel supply system OK? Filled it with diesel recently?
TBH unless you've a specific fault code, and even then even with one as vague as cam position sensor faults I would be checking the basic requirements of a combustion engine before I started messing with sensors.
I havent checked the coil packs, will check fuel pump (although would hope he has done this already)TBH unless you've a specific fault code, and even then even with one as vague as cam position sensor faults I would be checking the basic requirements of a combustion engine before I started messing with sensors.
I dont think I have filled it with diesel
Check the fuel pump. This is a common problem on the E39 M5...sudden stranding, non-start etc. A knackered pump won't throw a code (a dodgy fuel pump relay will produce a code though). Take out the back seat (done in seconds) and listen for it energising when going through a starting procedure. The pump is located under where the off side rear passenger sits.
Depthhoar said:
Check the fuel pump. This is a common problem on the E39 M5...sudden stranding, non-start etc. A knackered pump won't throw a code (a dodgy fuel pump relay will produce a code though). Take out the back seat (done in seconds) and listen for it energising when going through a starting procedure. The pump is located under where the off side rear passenger sits.
He said he had checked this but will reiterategowmonster said:
Diesel nozzle is bigger, i'm sure when it didn't go in you'd have noticed and went wtf.
my 330 went very rough when the air hose split. it was after the air sensor. checked that?
Oh yeah double checked with the garage and it was defo unleaded I put inmy 330 went very rough when the air hose split. it was after the air sensor. checked that?
I've asked the mechanic to check all the basics like fuel, spark and mentioned the air hose as it seems to be common.
He replaced the Cam sensors but was still getting an open circuit so isnt quite sure
gowmonster said:
could be a break in the wire from the cam sensor bit where it plugs into the wiring harness.
Yeah I think that's his suspicion too, its just the time involved in finding it really, sure he'll get there but we are on a ferry on Thurs so are currently looking at alternatives, just stty timing reallyGassing Station | BMW General | Top of Page | What's New | My Stuff