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Old 11-20-2010, 07:25 PM   #1 (permalink)
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put new injectors in ,now with hard start M20

once running it is great compared to old injectors, but noticing hard start, does the ecu have to learn the new injectors? air in lines? do I have to purge it somehow? did not have this problem with old injectors
I also cleaned rotor and cap , it looked fine
injectors are OEM, no change

this is an 89 525i with 70K. valves just done with new plugs too.

any thoughts?
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Old 11-20-2010, 08:34 PM   #2 (permalink)
OMFG another one!?
 
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How are the fuel pump and filter?
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Old 11-20-2010, 08:37 PM   #3 (permalink)
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new fuel filter, pump is fine, this just started after I put injectors in today, no previous problem, I suspect air in system, could that be??
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Old 11-20-2010, 08:51 PM   #4 (permalink)
OMFG another one!?
 
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I'd say that's possible.
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Old 11-20-2010, 09:00 PM   #5 (permalink)
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wonder how long ( many starts) i should give it before I start checking all the fuel delivery systems , regualtor, pump?
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Old 11-20-2010, 10:07 PM   #6 (permalink)
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I think that most of these fuel injector systems return excess pressure from the fuel line to the main fuel tank in a constant loop process, so I would have thought that the system would self purge pretty quickly. Check the voltage that you have on the injectors to see what it is. The old injectors where possibly a little looser in the mechanism, and got by with the reduced voltage. This could be complete twaddle, but worth a look.
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Old 11-21-2010, 06:50 PM   #7 (permalink)
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almost embarrassed to say but this morning when she was hesitant in starting I reviewed my procedure in my head and realized I hooked up the senders backwards - the temp and oil pressure. Put them on correctly and it corrected issue.
crisis averted
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Old 11-21-2010, 07:39 PM   #8 (permalink)
OMFG another one!?
 
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Very nice news!
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Old 11-21-2010, 08:01 PM   #9 (permalink)
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yes it is!
I learned working on the ol MB's to trace my recent steps of the project when something stops working that used to work before I started. Just took me 24 hours to remember (lol)
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Old 12-03-2010, 08:53 AM   #10 (permalink)
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OK , now its turned cold and I have the dreaded cold start issue, but intermitant, runs great , and usually once started is fine all day. It seems that it is a range of temps that causes my issues Low , like below 20 to about 40 F other temps or if car is warm, OK.
No smell of gas, no idle miss, nothing , just this start issue. I checked for vacuum leaks. I have read about ICV issues , but not sure I understand how that all works,
Thoughts??
Could my inadvertant mix up of sensor connections cause the one to the ecu to fail??
My temp guage is working fine
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