I started my project car and took it out of the garage for the first time since last September. Went for a quick shake down drive.
Proof...
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I've been busy stripping the interior and the wiring harness. This is a 1998 BMW 323is, so it's an OBDII car. The wiring is complicated. I removed all but a handful of the wires necessary to start and run the car.
The BMW ECM has security programming built into it, like a lot of cars these days. So it requires a signal transmitted from the key to a security module which is then received by the ECM. If the key code doesn't match the code stored in the ECM, it won't enable the starter circuit, the fuel pump or the injectors. The starter circuit can be by passed, which I did. But the rest requires reprogramming to remove the security system.
I tried ordering just a replacement chip which required unsoldering the old chip and soldering in the new one. Like an idiot, I also continued removing wiring like a fiend. When I finally got the wiring stripped down to where I thought it should last winter, I tried starting the car. It would crank but it would not fire up. I had no way of knowing if it was my wiring or the soldering job on the chip. I gave up for a while.
A couple weeks ago, I started trying to diagnose the no-start issue. I had a feeling that it was the computer so last Monday I ordered a new ECM that had the security removed. It was only $125.
While I waited, I tried a few diagnostic things but my skills with a multi-meter are lacking. I did try to connect a code reader but it wasn't communicating with the ECM. That was another clue. I verified that my fuel pump was working by jumping the relay. But it seemed like the computer was not sending the signal to trigger the relay.
Friday I got the new ECM. I plugged it in, turned the key and she fired right up!
Today, I buttoned up the wiring, bolted the steering column back in place, installed the seat and took her for a drive. I don't have plates so I just ran a quarter mile up the road; back and forth a few times just make sure she got a chance to get good and warmed up.
None of the gauges are working so I have some work to do there. The wiring for the gauges is a little more difficult to trace as you have to jump back and forth between the pinout descriptions and the wiring diagrams.
Of the exterior lights, only the brake lights are wired. I decided to wait on other lights until I got the important stuff working.
So, I still have a lot of wiring work to do. Then I can start on the roll cage.