BMW 630i - GDi - N53 30A - Siemans MS80

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Re: BMW 630i - GDi - N53 30A - Siemans MS80

Postby STC » Thu May 19, 2016 8:35 pm

Andrew

Thanks for that Info and it does help. I'm still out of my comfort zone with regard to data sheets and specs.

Today I managed to find a similar ECU, (don't know the full history of it). I swapped the mosfets & blown resistor over.

It doesn't start but I now have Injectors 4, 5, 6 Firing and the Fault code 30BB is eliminated. Now I have 30BA. Which points to Injectors 1, 2 & 3. We have a step forwards and a step backwards.

It takes some serious heat to lift and fit these mosfets so fitting new ones has to be worth a shot.

These IRF W644B I believe are now obsolete . I have found these at RS

http://uk.rs-online.com/web/p/mosfet-tr ... s/7598949/

I need some hand holding, Would you be kind enough to take a look and hopefully confirm that these are a Viable replacement.

Regards
STC
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Re: BMW 630i - GDi - N53 30A - Siemans MS80

Postby KimAndersen » Thu May 19, 2016 9:49 pm

HI STC

I think the mosfet datasheet you have found is nearly similar with the original Fairchild IRFW644B.

FAIRCHILD MOSFET IRFW644B.pdf
FAIRCHILD MOSFET IRFW644B
(799.24 KiB) Downloaded 37 times


Regards
Kim
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Re: BMW 630i - GDi - N53 30A - Siemans MS80

Postby STC » Fri May 20, 2016 8:42 pm

Kim
Thank you for that, I will order a handful of them.

Today I removed and cleaned the spark plugs, there was a lot of water sitting above the plugs and around the base of the coils. To give it a fighting chance I didn't fit Plugs 1, 2 & 3, Good news is that it now starts and idles on 4,5 & 6.

Fingers crossed - I'm quietly confident that I can bring this back to life, firing on all six
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Re: BMW 630i - GDi - N53 30A - Siemans MS80

Postby andrewbishop66 » Sat May 21, 2016 9:27 pm

Electrical data is all but the same got to agree it would be a good substitute the switching off delay is far better than the originals aliexpress are listing the W644B $15 for 20 but with rs the quality will be good not all components are what they are stamped

Thanks Andrew
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