350i running far far too rich after clutch replacement

[maston]

Hi guys,

My 1989 350i has me and my mechanic stumped for ideas and hopefully someone can help please ?
It has just had a new clutch (so now new top engine and clutch) and is running far far too rich.
Black smoke coming out of the exhaust and only just idles.
We have tried a spare air flow meter but no change.
Have tried adjusting the mixture but no change either.
Have tried another auxiliary air valve but no change.
Have replaced the plugs/leads but no change and the plugs soon get covered in wet black deposits so it then starts to missfire.
Throttle pot all checked and readings correct.
For your info it has had a new fuel pump and new fuel filter and I'm wondering if the fuel regulator is at fault ???
Could this be the timing that is out or something else ???
Any advice greatly appreciated.
Kind Regards
Ian

[maston]

Thank you for your replies and especially to honestJohntoo, very helpful. I will have a look at the CTS and update you on the progress.

Regards
Ian

[maston]

Is the engine temp sensor the same as the Coolant Temp Sensor ?

Also I have read about an efi earth strap behind and below the LH rocker cover, could someone tell me where this is please or show where it is ?

Many Thanks

regards

Ian

[maston]

Thank you for your replies everyone.
Adam, I cannot see an earth from the block to the bonnet catch, have you got a picture please ?
Many Thanks
Regards
Ian

[maston]

honestjohntoo,
Excellent, thank you especially for the ecu multiplug diagram.
Where do I find what the voltages should be for each pin please ?

Many thanks
Regards
Ian

[maston]

Thanks Wedg1e , do you have one or has anyone else got one please I could borrow ?
Happy New year to you all
Regards
Ian

[maston]

[quote=honestjohntoo]Bearing in mind you have not reported any new symptoms other than running far too rich, I still think you have one simple fault caused when something related to the coolant temperature sensor became disconnected when the engine was moved during clutch replacement.

Thank you for your reply but perhaps I did not mention that is running VERY rough, clearly misfiring and not running on all 8 cylinders.
I have ascertained though that it is not a CTS fault and is now looking like an ECU fault.
Thank you anyway.
Regards
Ian

[maston]

Wedg1e said:

Worst case scenario, send the ECU up to me and I'll give it the once-over and sort as necessary - and I won't even charge you (apart from the return postage),
At the last count I had about a dozen spare ECUs (including 390, 3.9 Rangey and supercharged 350), I can match another to yours if necessary.

Thank you very much, appreciate it.
My ecu is a Lucas 4CU Fuel Control Unit.
Do you have a spare that I could try, I will of course pay postage by paypal etc.?
Kind Regards
Ian

[maston]

honestjohntoo said:

If you literally cannot see the two earth ring connectors (even from below the car looking upwards, which is dead easy) that are supposed to be on stud(s)fixed into the block behind and below the rear of the LEFT HAND rocker cover, then one must only assume that it has not been reconnected correctly after the clutch was repaired.

Are the studs there?

Perhaps on a TVR they connect elsewhere to the engine block, but I cannot work out why?

These two SD1 drawings depict the whole of the Efi loom which should be similar to yours, and the two ringed earth connectors are clearly shown.





The two BW wires go to the coolant temp sensor and to pin 35 of the ECU multiplug.

Edited by honestjohntoo on Tuesday 20th December 20:55

honestjohntoo, have you got a key to what the various colours of the wires are please ?
Eg what is YW,YP,SP etc. etc.

Many Thanks

Regards

Ian

[maston]

Thank you very much honestjohntoo.

The mystery with my running problems continue as an auto electrician has been round to test all the wiring and he said it is all good.
I'm wondering if I have a faulty injector or tow ?
Tested a few of them earlier and they were all 0.3 ohms ?

[maston]

Thanks for the replies, can I confirm that the red relay is the steering module and if so where in relation to this is the main relay and fuel pump relay ?
My red relay is on the top left of the relay board if this helps ?

Many Thanks

Regards

Ian

[maston]

pjtvr390se said:

The larger red plastic relay is the steering module, on my car it is situated between the main and fuel pump relays at one end of the relay board. It sounds like yours is different but those three relays are likely to be together as they are part of the engine relay set up rather than the car equipment relays.

Thank you, I will have a look at the weekend. I have just noticed too that there is only 3 wires attached to the coil in total (not including the suppressor) but I have been looking at a wiring diagram and there is 4 ???
2 from the ignition module to the coil and 1 from the ecu pin 1 to the coil and 1 from the ignition switch to the coil so I MAY well have found my problem ???

[maston]

Wedg1e said:

Ian, can't make any promises at the mo but I have to drop into Milton Keynes on Monday so if you haven't sorted it by then I might be able to detour on my way back to Gosport...

Ian, that would be brilliant, thank you.
My number again is 07825767019.
By the way I have just spotted something which I think is CRUCIAL

One of the brown wires in the power resistor connector was very lose (almost half out) and the metal connector at the end of the brown wire is in half !!!!!!
Unfortuantely the battery is now flat so I won't know until I try tomorrow, could this be the cause ???

[maston]

The over fueling was when it was running (has not been running for some time now) as it was smoking (black) like a steam train.
To add insult to injury, the starter motor is now playing up. Obviously seized as it doesn't spin at all. Not the battery as it fully charged.
I have reached the end of my tether and will now sell it.
So any body interested in making me an offer ? Apart from the running issues it is a nice wedge, the bodywork is in superb condition.
Any offers welcome.
Regards
Ian

[maston]

I'll correct myself (apologies) what happens it does actually turn the crankshaft etc. but very very slowly and only a few inches at a time, then a long pause, and then it will turn a few inches again etc.
Exactly the same symptoms as if the battery was flat but I took the battery out of my old BM (fully charged) to try that battery too and the same symptoms occured.
I am gutted/p*ssed off at the same time with this car !!!
Made worse the fact that it has a brand new clutch in it !
Such a shame as it is a really nice example (bodywork excellent) and do not want to sell it but I have lost all patience now.
Wedge1 kindly said he may be able to have a look on Monday (fingers crossed).

[maston]

Hi Chris, I've had enough of it now and have decided to advertise it here on pistonheads.

Speak to you soon mate

Ian