E30 320 won't start plz help

[Mavee]

Hi guys I have E30 320i 1989 model black bumper its jst died while driving in February we check every thing on the car every thing is working fine excapt it won't start jst cranks the fuel is there the spark is a bit low change coils bt no help I even chanhged engines bt the new engine won't start also changed coputer box ,fuel pumps, boggy chords, spark plugs, engine harnes all relays and all the parts I changed r working fine in the other car even changed the black box still won't start any help any 1 please

[Speedtouch]

Welcome to the Zone!

See the Zone troubleshooting guide:

http://www.e30zone.net/e30zonewiki/inde ... oubleshoot

[Brianmoooore]

boggy chords????

[Mavee]

Boggy Chords AKA HT lead or spark plug cables. I have tiried most of this but this not starting I changed the ECU no help can any tell me what courses a weak spark even when I change both the coil and the plugs

[Speedtouch]

Check the engine-to-body earth strap, and all connections within the ignition system that lead to the ignition coil.

You could also try directly connecting the '+' terminal of the ignition coil direct to battery '+', then spinning the engine over.

[Brianmoooore]

After all that work anything could be wrong with it, which may or may not include whatever was wrong originally. This is why you should never change a component without proving it is faulty first.
However, you now have to start from where you are, so the first checks, as ever, are 1) do you get sparks at the plugs when the engine is cranked? and 2) does the fuel pump spring into life when the engine is cranked?

[Speedtouch]

Which "black box" did you change?

Also, is the new engine from the same age of car, or a pre-facelift (chrome bumper) 320i?

[magpie]

put direct 12v to the fuel pump so you know it's pumping then crank it

[Mavee]

I tried all this tricks I have started lots of E30 never its the fisrt time I have been unable to start this I even got my mechanic friends to come help they hot wired the car in different ways bt still nothing. He engise is the same age n the 1 that was not starting started on the other car.

[magpie]

[Speedtouch]

Get a compression gauge and run a compression test on the engine - all six pots should read at least 180psi or so.

Try a squirt or two of brake/clutch cleaner down the throttle body whilst cranking it over.