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The final solution was I replace the wire from the PCM to the Fuel pressure sensor and the problem never came back. I beleive ultimately there were several problems along this same wire. I think the PCM connectors was a bigger problem and I when I fixed that in an earlier post it certainly made...

So this is a very slow project, but I went out today and replaced the PCM pins for the high pressure fuel pump and the car ran great after this. I also installed new Plastic PCM connector hold down cams. Previously mine were missing. I drove the car today and it ran great for about an hour and...

So I went out today and am fairly certain the problem is at the PCM wire connector harness. I had tested the old PCM and it was outputting 5 volts on a fuel pressure sensor wire where it should not have been and that was with no wire connected to the PCM pin. Manual said to replace the PCM. I...

Finally getting back to this project. I did replace the PCM and I had the dealer program it and the keys and I still have the same problems exactly. I still believe this has to be a faulty wire. I believe in the PCM plug. I have tested the wiring with the PCM disconnected and it checks out, but...

OK so an update on the car. Sorry for the long delay, but this is a project for me. I have found the PCM to be faulty. I have sent it off for repair and it could not be repaired. I was getting a bad signal from the PCM on the circuit going to the fuel pressure sensor. The repair shop confirmed...

I don't know history of the car, but it appears to be all stock engine wise. The car has been lowered, with larger wheels, but that is all I see. Today I got a new fuel pressure sensor in the mail a day ahead of schedule and I installed it, and now the car will not stay running. I am back to...

A little history since I am new around here. I just bought my first Mazdaspeed 3. I am totally new to Mazda. I was looking for a fun little car, that wasn't to low to the ground and easier to get in and out of. I found the car I bought down in Atlanta and seems to be rust free, and in decent...

Hello, I am new to Mazda Ownership. I previously owned a Nissan 350Z and Audi S3, and I had to sell them due to health reasons. I now drive a boring SUV. With my health starting to do a little better I have the itch to get a more sporty car to play around with. I found a 2008 Mazdaspeed 3 at a...