735 M30 spluttering - solved

[SharkGill]

Hi all, recently my car has started rough idling and hesitating, misfiring on lower revs. This smooths out as the revs and speed increases. I understand there could be a number of causes but where is the best place to start? I have diagnostic software on a laptop with the correct leads, would this give me any useful information?

[shogun]

well, a diagnostic check with a laptop is the fastest and easiest to see if you have some faults stored. Do it and report back.

[SharkGill]

Cool. Turns out I don't have the serial to USB cable which goes from the laptop to the interface funny thing is it seems ok no lol

[SergeBMW]

Well for the future, these engines are pretty bullet proof, usual suspects are

- Spark plugs
- Spark plug wires
- Distributer and rotor
- Crankshaft Position Sensor CPS

[shogun]

My checklist posted in 2009, checklist Rough-Idle-no- power-Shimmy- the-Ultimate-Guide http://www.bimmerforums.com/forum/sh...idle+now+power

[SharkGill]

Cheers for the links. I'm getting no where with the software. Funny thing is that the car is now fine. I get no washer spray when I pull back on the stalk only when I push in for th super wash. This is when the car started spluttering. Further investigating shows this was not just a coincidence (can't add pic from my phone) turns out I've got washer fluid leaking behind the bonnet sound deadening straight onto the engine.

[shogun]

The you have to remove the complete sound deadening mat from the bonnet, a lot of plastic pins to be removed, just did that last week on a spare bonnet which I gave to a friend and I brought it to the paint shop, so I stripped all parts. The washer nozzle comes out from inside, there is a plastic clip which you have to push and then you can push the nozzle out. Or try it like this https://www.youtube.com/watch?v=ls7dsPUQee8
But if it leaks, you have to check the hoses.
Here you can see the tabs on the nozzles http://www.unofficialbmw.com/e36/ext...d_nozzles.html

[SharkGill]

I managed to fix the leak quite quickly, the hose had come off from the jet nozzle. Running sweet now.