350i fires immediately then dies just as quickly
Discussion
Just had a trouble free week, except for the pinking. Left the car for a week and it fired up then died, fires every time but won't run. History that I think is a different problem but may be relevent or symptomatic of something that just got worse. I adjusted the throttle potentiometer from 105 to the recommended 325 this made the car run better but the tick over would not adjust to less than 1000rpm. High oxygen reading on the MOT but I cannot find any leaks on the inlet, tried disconnecting and blocking all bits and pieces rpm did not change as I reconnected, until the oil breather then it rose. All this was prior to the good week. Sure you guy's have described this problem before but cannot find it. Help wifey wants the hair dresser special next week and please I want Trevor back!
I'd be with Rev on this one. So wip off the AFM inlet pipe and with ignition on push the flap to see if the pump is running. Failing that your injectors may not be firing and your initial start up is due to the cold start injector priming the plenum on its own. Better Peeps will be along shortly with more help - good luck.
dickymint said:
I'd be with Rev on this one. So wip off the AFM inlet pipe and with ignition on push the flap to see if the pump is running. Failing that your injectors may not be firing and your initial start up is due to the cold start injector priming the plenum on its own. Better Peeps will be along shortly with more help - good luck.
Disconnect the cold start inj see what happens ??
badredwedge said:
I'd be with Rev on this one. So wip off the AFM inlet pipe and with ignition on push the flap to see if the pump is running. Failing that your injectors may not be firing and your initial start up is due to the cold start injector priming the plenum on its own. Better Peeps will be along shortly with more help - good luck.
Disconnect the cold start inj see what happens ??
and if it don't fire then...... your injectors aint opening?
Make absolutely sure the ECU connector is latching into the ECU properly (that daft spring clip).
If, with the ignition on, you flick the throttle wide open, do you get a 'click' from all the injectors?
You might just have a dodgy ECU, anyone local to you who can do a quick swap to check?
If, with the ignition on, you flick the throttle wide open, do you get a 'click' from all the injectors?
You might just have a dodgy ECU, anyone local to you who can do a quick swap to check?
Do you have 12v *to* the injectors? If the answer is 'yes' then check that the -ve side of the injector is connected to the ECU, and the ECU itself is earthed. If it is all OK then you ae looking for something that would stop the ECU from even trying to fire the injectors. Is the ECU itself actually powered up?
The man is too modest. Cannot disagree with the timings 
. My ecu seemed to prefere connection via Ians magic diagnostic box. Immediately started to run, well at least on one bank of cylinders. A few switch flicks on the magic box proved the other 4 injectors were healthy, then they decided to work too. Bit more fiddling revieled a bad connection (mucky, sods law I had already checked them and they were o.k)on the resistor pack. Then what was the problem. A few well aimed Wedg1e punches 
on the ecu and it died, a few more punches and its up and running again. So we decided to try one of 'merlins' spare ecu's although the meastro had warned me that they should be factory matched with the air flow meter, sod must have realised it was Sunday and gone to church, Ian's ecu had the engine sounding better than it ever has. A week of 
to really prove it, then its into mine with the soldering iron but I think there will be some horse trading to be done for the one thats installed now.
Thanks again Ian.
>> Edited by clasabro on Sunday 2nd April 17:48
>> Edited by clasabro on Sunday 2nd April 17:50
. My ecu seemed to prefere connection via Ians magic diagnostic box. Immediately started to run, well at least on one bank of cylinders. A few switch flicks on the magic box proved the other 4 injectors were healthy, then they decided to work too. Bit more fiddling revieled a bad connection (mucky, sods law I had already checked them and they were o.k)on the resistor pack. Then what was the problem. A few well aimed Wedg1e punches on the ecu and it died, a few more punches and its up and running again. So we decided to try one of 'merlins' spare ecu's although the meastro had warned me that they should be factory matched with the air flow meter, sod must have realised it was Sunday and gone to church, Ian's ecu had the engine sounding better than it ever has. A week of to really prove it, then its into mine with the soldering iron but I think there will be some horse trading to be done for the one thats installed now. Thanks again Ian.
>> Edited by clasabro on Sunday 2nd April 17:48
>> Edited by clasabro on Sunday 2nd April 17:50
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