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Got everything put back together. Took 2-3 tries of dying right away before it finally fired up and held. Had a little bit of misfire for a bit and then smoothed out. Letting it idle for a while as I recall reading somewhere that's good for ECU relearn (not sure it's necessary but doing it...

Awesome. Really appreciate the help here. After we get the vacuum leak figured out we'll start digging into filter options and how we can get that honeycomb to fit. What you're saying makes sense. I'll also say, I'm very unhappy with the air filter itself. The original MAF was caked with...

Well, I'll be. We unplugged the MAF. It died immediately on 1st try. 2nd try, it ran fine. I assume by " a tune that isn't for the intake on the car" you're referring to the cold-air intake, not the intake manifold. The intake is the same as came with the car and has never been an issue...

Thanks for the response. It's an aftermarket intake. Have already pulled the filter. I don't see an airflow straightener. Not even sure what to look for there. When I was choking it, I had pulled the filter (MAF and intake still installed). So it was still reading flow from MAF. Yes...

2007 Mazdaspeed3 Mileage: ~60k (JDM about 3mo ago) Location: Idaho Concern: My son called and said he couldn't get it to run right. He's up at college and without tools/space to work on it. So I just towed it home for us to work on over Thanksgiving break. Meaning I'm under a time limit...

Forgot to say, I was able to blow through the pipe towards the engine freely. When I sucked I got just a bit of dirt but it's cleared out now. So, I'm rolling with bad check valve. Any reason we have to stick with stock specialty part here instead of just a pipe with check valve on the...

Ok. I don't think the engine swap had anything to do with this but... I've been burned once assuming on this project already. Car is running great now except brakes are stupid hard to push. I read that there's a check valve in the line. I pulled it to troubleshoot and found what looked...

Well folks. We have success. I have to preface, I'm an electrical engineer. I know my way around a multimeter. I checked against the negative cable to the body of the hpfp and all around it and to the ground connections. All 0 ohms. Just to be comprehensive (before dumping 400 on a pump)...

Thanks. Also realized I haven't checked KOEO fuel pressure which should give me pressure without HPFP interaction. If that's at 70psi, then, yeah FP is fine. If that's garbage, then I feel more confident it's gone south. I've done a bit of reading on grounds too. I think I'm going to get...

I guess I haven't replaced the Fuel Rail Sensor. That's the only other part I can think of. But - I'm just not seeing how that is the problem.

Ya, just to give the warm fuzzy I resistance checked various spots around the block and HPFP area. All 0's, so no resistive connections. I mean, honestly I wish it was that. It would be way easier and cheaper but I'm just not seeing it. Just to confirm though, you guys keep talking about the...

Welp. No joy. It's running better for sure but p0091 still there. Before we weren't even able to make it down the block. This time, we were able to drive around the community but lots of hesitation and bogging. Watching the PSi as we drove, the times it really bogged or hesitated, the psi...

Ya, we swapped that out too. I honestly thought it would be that for sure for exactly the reason you said. I had only done visual check of wiring. It all looked good in my defense ;) Seriously though, no pinch points or scrub marks. Not your usual suspect problem spots. Did some...

OK folks. Back for more advice. I still have the old engine so we just went brute force with it. We swapped the HPFP (with the spill valve) and the PRV. We checked and retightened all the grounds I could see around the HPFP. We checked the wiring as well, it all looks OK. No change in...

I'll check koeo when I get back to the car. That was my thought too, it seems like I'm not seeing the hpfp reading OR I am and it's toast. Would it even idle smooth if hpfp was at 50psi? There is some hesitation when I Rev it. Oh, and a lean condition code popped up - no surprise. Anyone...

Hmm. So when I graph it using torque pro, fuel rail pressure as x, it shows 430-500 (a bit bouncy). It doesn't show what the y units are though. When I just create a dial to watch fuel rail pressure, it says 50ish. I trust the dial gauge since it actually gives the units. So, maybe I'll...

We just swapped in an ms6 engine into our 2007 ms3. It's running but we get an p0091 code. We haven't moved it out of the garage yet, so just idling with some revs. Totally new to mazdaspeed but not to working on cars. I'm looking for ideas of what to look for. I have torque pro and able...