Weird start problem

[TwinsPoppa]

Did you ever check out your battery?

[fmugur]

It's one year old battery. Always starts ok in the morning but I would think it's a timing problem like 8 hours of sitting in the garage but actually if I leave work after 8-9 hours it still cranks a good few seconds before starts.
I thought is the temperature but it isn't. It doesn't matter if it's winter, summer, outside or inside. It does this only between 1-8 hours interval (overnight). It also starts ok within one hour after start ...
I changed the speed/position sensor and flashed the DME with the latest firmware and no luck.

I flashed it with 12 14 7 533 588 since I don't know what this is:
"What is For vehicles with:
High speed synchronisation (S840A) = Yes"

http://bmwfans.info/parts/catalog/E5...me_programmed/

The other option is 12 14 7 533 590.

Can you comment on this? Should I try ...590 firmware?

[TwinsPoppa]

Originally Posted by fmugur

It just seems like a few cylinders help out the starter and I have to press the gas pedal to increase the rpms and then all start ok and the starter stops.
It was thinking it might be an exhaust issue like the secondary air pump not pumping enough air or something like that to clean the cylinders ...

It could be the injectors as well, I have no clue at this point. My injectors were clean and the filters changed. Maybe they messed up something when they did the injectors cleaning. I will have it diagnosed on the 28 of Nov by an good indy shop. Not sure if the dealer was a better option.

Did you NOT have this starting problem prior to this cleaning?

[fmugur]

A long story short, I had the engine out and beside cleaning the injectors I replaced chain guides, chains, vanos... everything. I did not have this starting problem before.
Having said that it could be from anywhere... but the question is now how can I debug it.
The indy that I actually trust couldn't find the problem. I took it twice. I am thinking that my next step is to take it to the dealer but not right now.
I have the GT1,INPA what can I try/test/check to debug it?

[TwinsPoppa]

Originally Posted by fmugur

A long story short, I had the engine out and beside cleaning the injectors I replaced chain guides, chains, vanos... everything. I did not have this starting problem before.
Having said that it could be from anywhere... but the question is now how can I debug it.
The indy that I actually trust couldn't find the problem. I took it twice. I am thinking that my next step is to take it to the dealer but not right now.
I have the GT1,INPA what can I try/test/check to debug it?

I'm sorry but I'm not knowlegeable enough with the GT1 to say what tests to perform. Obviously, there are the basics that are needed - air, fuel and spark.

If you're not getting codes/faults, and therefore don't have a straightforward test plan you can follow, then it can be frustrating.

Hopefully someone can give more pointers on what to do from here. For now, I suggest going through the GT1 and, IIRC, looking through the function module for possible test plans to run related to fuel and spark.

When I get my GT1 back, I'll look and let you know if I find any possible tests that might help diagnose your problem.