What led you to replace the injector?
How old are the MAF and the precat O2 sensors?
What brand fuel pump? Have you tested fuel pressure?
Do you know the fuel trims at idle and cruising RPM?

 

First step is to isolate what is causing the misfire: fuel, spark, air, etc.

 

Well after a full day of ELIMINATING everything else we could I finally took out the DME computer and took a little closer look at the circuit board:

I do believe we have discovered the problem!

 

I have already pulled a DME MS45.1 from a 2004 325i (M54). I have a K+DCAN USB Cable but does anyone know where I can download a copy of the INPA software and how to synchronize or Align a BMW ECU DME to the EWS CAS security system ISN? I think I can get this resolved myself if I can get some direction.

Note: The small CD you see that says BMW Drivers is not the INPA software I need.

Thanks,

Mark

 

Well done finding the problem! We have seen that a few times over the years.
I would first try to repair your DME, that is cheapest and easiest.

None of the BMW Standard Tools software (INPA, etc.) can reprogram a used MS45.1 DME to work with your EWS.
You have to find someone to either program that DME with EWS delete, or virginize it and clone it from your DME’s software.

As for installing BMW Standard Tools software, hit the link in my sig.

 

So I've been thinking a little further on this and what If I was to go back and pull the Immobilizer unit from under the dash as well is the other unit that sits next to the DME computer from the donor and then I would have all 3 components from the same car. I do own an AK90+ key programmer and I was wondering if I could reprogram my 2 existing keys to the 3 components that I would have from the donor car. Would that work? Another idea I had was that as you saw on the computer from yesterday the #5 chip was burned. I wonder if I could remove the #5 chip from the donor unit and solder it back down to the original unit, would that possibly work? I know I'm grasping at straws here but after reading what you told me yesterday I have my doubts on whether I could just clone another computer. Also I found out last night the computer out of my car is a DME MS43 and the donor computer is a DME MS45.1 which I am already told will not work. Any ideas? I'm willing to pay someone to help me at this point.

 

Ok, so your car is pre-03/2003 and therefore has the MS43 DME, which makes this much easier to reprogram a used MS43 DME to your car with EWS delete. Check out ms4x.net for the details.

An MS45.1 DME won’t work in your car without a major electronics retrofit, so forget that.

Keep in mind that the DME/EWS/keys/locks are all a matched set to eachother and the VIN. Yes, if you swap all it will work, but the caveat is you could only buy a genuine BMW replacement key if you can provide proof of owership of the donor car.

I would first try to repair your DME as that is easiest and cheapest. If that doesn’t work, then buy a used MS43 DME and mod it with EWS delete.

 

I’d replace the bad part, which happens to be a metal oxide substrate field effect transistor (MOSFET). They are used when the current flow is high and rapid switching (on-off-on) is needed. The DME has them for the injectors and the coils. Go to www.mouser.com to find a replacement. Mouser sells everything electronic.