E30 Zone

Needing a bit of help here guys I have a 320i with cold starting issues ....
It's an 1989 320i auto
To start the car from cold you have to depress the accelerater pedal fully for it to fire up, once running it runs with a slight hunt until warmed up to normal operating temp.
There are no air leaks and I've changed the plugs, also I cleaned the inlet throttle body and tps aswell as the icv.
I remember seeing a post about 320i ecu's having problems with cold starting issues or something and dealers at the time were retrofitting relays between the temp sensor and ecu? probably the next thing I need to look into....brian?
Any help would be much appreciated thanks
Azzy

IIRC, the problem with the 320i was over fuelling at start up, and the mod. was to add a relay, activated by the starter signal, that switched a resistor in parallel with the 'blue' temp. sensor, making the ECU think the engine was hotter than it was, and reducing fuelling just while the starter motor was operated.
The hunting you describe indicates a weak mixture, rather than rich, so the first thing I'd do is have the injectors rebuilt, in case their flow rates are down, and possibly leaking fuel into the inlet manifold while the car is stopped, which will make starting difficult.

Thank you Brian I'll get them rebuilt a‘aaaa

Who's good to use for Injectors? I need to get the set on sport done soon.

I rang up pj motorsport in wolves...they said they do the ultrasonic cleaning ...are some better than others or is it just a case of getting them cleaned out via a pressurised system and cleaning fluid by any company?

They need to be cleaned, worn parts replaced, and calibrated for correct flow rate and balance.
If you look in our traders' section, you will find 'injectortune', who has rebuilt hundreds of injectors for zone members.

Hi Azzy,

I have used injectortune and the service is excellent. They did the injectors on your old car ;)

Thanks guys I will use them a˜Ša‘aaaa
M3evo....my which old car? a˜a Lol

The car that you miss the most...! lach silver G reg Sport

Ohhh! Mo how are you? lol I didn't recognise your username
Yup sure miss that beauty!
How does the car run and did injector cleaning make a big difference on that?
Generally that car was running well while I had it a‘aaaa

All well, yep definitely made a difference and drove much smoother and the mpg improved.

Just treated her with a set of smoked genuine MHW tailgate lights and genuine smoked hella front lamps for the winter

How much difference rebuilt injectors makes depends entirely on how bad they were in the first place, but by 100,000 miles they will each have opened and closed around 40 million times, so there's a good chance they will be well past their best.
E30s vary from most of their contempories because their (post '87) electronics was far more sophisticated than others, but still without any monitoring (lambda sensor) of the actual mixture strength. This means that the ECU provides pulses to the injectors to provide the correct mixture strength assuming that a given length of pulse will inject a certain amount of fuel, without any attempt at compensating for worn injectors, as a later engine would, so, without known good injectors, it is impossible to set up any other adjustments on the engine.

Cool Brian I hear you â˜aaaaï¸aâ˜aaaaï¸a