- Joined
- Apr 27, 2012
- Points
- 100
I recently did an EWS swap and during the process I had contact with various people, one of which was a BMW mechanic at a dealership.
When I was leaving, he came out to see my Z3. I put the key in the ignition, and cranked the motor which took more than the usual one and a half turns to fire up. He commented on the fact that it didn't take immediately and said that if / when that happens, I shouldn't continue cranking. He told me to switch the ignition on and off 3 times form off to position 2 (when all the lights come on in the instrument cluster). He said by doing this one is actually re-starting the fuel pump in the tank which pumps fuel up into the fuel rail creating pressure there.
He said that sometimes fuel pressure drops in the fuel rail and by doing the switch on / off / on thing this will create the correct pressure for an "instant" start and will prevent excessive cranking.
I asked him why pressure would drop in the rail and he told me that this is most often due to very small leaks past the rubber O rings which seal the injectors into the manifold and head.
Anyhow, I have subsequently ordered a new set of O rings and will do a replacement, and while the injectors are out, I will have them professionally cleaned by a fella that has an ultrasonic "injector bath".
But the tip is valid. I have been using it and the car fires up instantly.
When I was leaving, he came out to see my Z3. I put the key in the ignition, and cranked the motor which took more than the usual one and a half turns to fire up. He commented on the fact that it didn't take immediately and said that if / when that happens, I shouldn't continue cranking. He told me to switch the ignition on and off 3 times form off to position 2 (when all the lights come on in the instrument cluster). He said by doing this one is actually re-starting the fuel pump in the tank which pumps fuel up into the fuel rail creating pressure there.
He said that sometimes fuel pressure drops in the fuel rail and by doing the switch on / off / on thing this will create the correct pressure for an "instant" start and will prevent excessive cranking.
I asked him why pressure would drop in the rail and he told me that this is most often due to very small leaks past the rubber O rings which seal the injectors into the manifold and head.
Anyhow, I have subsequently ordered a new set of O rings and will do a replacement, and while the injectors are out, I will have them professionally cleaned by a fella that has an ultrasonic "injector bath".
But the tip is valid. I have been using it and the car fires up instantly.