Leaking injectors.
Get a leak test done.

 

3 months on and no closer to a solution, completely and utterly at a loss.

Injectors came back as within spec but i did change the worst one out for a recon unit, all now showing as good in ISTA

new pump installed in the tank, this has changed nothing, as expected.

fuel pressure sensor on the rail changed, nothing.

past week the car has gone from bad to worse, and it was utterly shit before.

Today i checked EACH AND EVERY fuse in the glove compartment, i also changed the green relays over for good measure, i checked the 5 fuses that sit inside the DDE compartment of the engine bay and not one of them was broken/dirty etc

Using the ISTA software i CAN make the fuel pump relay click on, but that still wont give me the pre-supply pump *hmmmmmm* i need to get the car going.

Also used the ISTA software to check the status of the key, all comes back as fine and the key is communicating with the EWS module as it should.

With ignition on in position 2 i am getting between 2-4 psi of pressure on the rail (actual) but the car says (desired) is around 400, this doesn't change until the car is running where it stays between 380-420 psi until i turn off the car.

Car will drive utterly fine until i reach my destination, from there it is a complete gamble whether i will be stranded for 30 minutes trying to get it going again or it might just fire up immediately.

Today it left me sat in the supermarket car park for 25 minutes, when i got home i immediately shut it off and on again, i did this about 15 times, 10 of those times it burst into life no qualms, the other 5 it sounded like it was turning over really really fast but simply would not *catch* and start.

I am completely and utterly at my wits end with the car and would smile from ear to ear to wake up to it missing.

If anyone can give any insight into the procedure the car goes through to start the pre supply pump i would be forever grateful, i feel as if i am chasing a ghost around a dark room whilst throwing money at it yet all it does is laugh at me and call me a cu*t.

I need this car to see me through one more year of college, after that id happily turn it into a washing machine myself, but until then i would prefer to drive it.

Please help,

Matt.

 

:lol:lol:lol:lol
Try clamping the fuel return line from the injectors. As AlanG says may be a dodgy injector. Who tested the injectors and did they give/show you the specs and results???

 

Okay, So....... I have read what i believe to be every English language post on the internet regarding this issue, i would now consider myself a certified BMW technician.

The issue ALL ALONG was the fuel pump relay which sits BEHIND the glovebox.

BMW ista+ gives the location of the fuel pump relay on my vehicle as relay #1, every post i have read on the internet gives the relay as slot 1 also

Well, i have changed everything on the car, it's been in bits more times than i care to remember, so today i figured **** IT, i have absolutely nothing to lose, so using the BMW ISTA+ software to control the relay switching on and off i worked out that i have been changing the wrong fucking relay all along........

my salmon relay is #3

horn is #4

FUEL PUMP #2

A/C #1

i have come back here with an update because there is nothing more annoying than a half finished thread where OP states he will be back with future updates but never posts again.

to anyone suffering this terrible vehicle affliction PLEASE ensure that you are 100% positive you are changing the correct relays......

I could have saved myself days and hours of fault finding and hundreds of pounds in costs, had i just verified first 100% what i was changing.

 

Oké, szóval........ Elolvastam szerintem minden angol nyelvű bejegyzést az interneten ezzel a témával kapcsolatban, most már okleveles BMW technikusnak tartanám magam.

A probléma MINDENKÉPP az üzemanyag-szivattyú reléje volt, ami a kesztyűtartó MÖGÖTT található.

A BMW ista+ megadja az üzemanyag-szivattyú reléjének helyét a járművemben 1-es reléként, minden bejegyzés, amit az interneten olvastam, megadja a relét 1-es helyként is

Nos, mindent megváltoztattam az autón, kicsit többször történt, mint amennyire emlékszem, így ma arra jutottam, hogy **** IT, nincs vesztenivalóm, ezért a BMW ISTA+ szoftverrel szabályozom a relé kapcsolást. be- és kikapcsoláskor rájöttem, hogy mindvégig rossz kibaszott relét cseréltem......

az én lazac váltóm a 3

a kürt a 4

2. ÜZEMANYAGSZIVATTYÚ

A/C #1

Frissítéssel tértem vissza ide, mert nincs bosszantóbb egy félkész szálnál, ahol az OP kijelenti, hogy visszatér a jövőbeni frissítésekkel, de soha többé nem posztol.

Mindenkinek, aki ebben a szörnyű járműválságban szenved, KÉRJÜK, győződjön meg arról, hogy 100%-ig biztos abban, hogy a megfelelő reléket cseréli...

Napokat és órákat takaríthattam volna meg magamnak a hibakereséstől és több száz font költségtől, ha először 100%-ban ellenőriztem volna, hogy mit változtattam.
[/IDÉZET]

 

Hi ,what was the error code? I changed everything and 3000 rmp engine light ,rail 4b90

 

Old dead thread you might want to start your own with the details.

 

hogy érted?

 

Alter toter Thread, vielleicht möchten Sie Ihren eigenen mit den Details eröffnen

 

Hi everyone Did anyone got rid off 004B90 fault code, if does plz do let me know . Thanks in advance

 

Long tmie dead this thread you might want to start your own with some info.