So since I bought my 1990 325i vert I have the standard issue everyone seems to have, really long crank times when the car sits for a while. I have to crank it for 7 - 9 seconds and it stumbles on start but idles and runs great. If I turn the car off and turn the key right back on, it starts instantly. If it sits all night it starts instantly, if I leave it for a few hours it has a hard start. Mechanically I am solid but troubleshooting not so great but I am pretty sure I narrowed it down to the fuel injectors based on fuel pressure dropping at the rail after I shut it down.
I pulled the injectors, cleaned them per the pelican article and installed new o-rings. The car started instantly and perfectly for 3 days. Then, it went right back to where it was previously. Exactly the same long starts etc. I thought it was the o-rings but now I think I have some injectors leaking gas after I shut it off. But if that is the case, why would a good cleaning fix the problem for three days? In that span of time I changed nothing on the car. I come from carbs so this is the first fuel injected car I have worked on extensively.
Also, on a rebuilt or remanufactured fuel injector is that completely rebuilt or only the standard kit that you can buy; pintle caps, fule filters and a good cleaning and testing? I have found new not remanufactured injectors for around $35. That seems almost too good to be true but about the same price as remanufactered ones?
Anyway, my plan is to replace the injectors. It seems pretty solid that the issue is a leaky one or two but I thought I would throw it at to the group as to why a cleaning would mitigate the problem for a few days. Also, I put a new fule filter in prior to pulling the injectors.
I pulled the injectors, cleaned them per the pelican article and installed new o-rings. The car started instantly and perfectly for 3 days. Then, it went right back to where it was previously. Exactly the same long starts etc. I thought it was the o-rings but now I think I have some injectors leaking gas after I shut it off. But if that is the case, why would a good cleaning fix the problem for three days? In that span of time I changed nothing on the car. I come from carbs so this is the first fuel injected car I have worked on extensively.
Also, on a rebuilt or remanufactured fuel injector is that completely rebuilt or only the standard kit that you can buy; pintle caps, fule filters and a good cleaning and testing? I have found new not remanufactured injectors for around $35. That seems almost too good to be true but about the same price as remanufactered ones?
Anyway, my plan is to replace the injectors. It seems pretty solid that the issue is a leaky one or two but I thought I would throw it at to the group as to why a cleaning would mitigate the problem for a few days. Also, I put a new fule filter in prior to pulling the injectors.
Maybe it was just it's time? 
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