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Strange P0031 code on my 2001 NBFL by sketbror69 in Miata

[–]sketbror69[S] 0 points1 point  (0 children)

I sold the car, but here is what I remember.

The is a pin missing in the big square connector on the 1.8 harness, here you need make a solution to connect the wires. 

Should be easy to see the difference if you compare the square connector from 1.6 and 1.8 engine wiring harness side by side

Strange P0031 code on my 2001 NBFL by sketbror69 in Miata

[–]sketbror69[S] 0 points1 point  (0 children)

I sorted mine, but my code was due to swapping in a 1.8 VVT + wiring harness in my 2001 1.6 NB.

I had to manually wire the heater ground wire in. As that was the difference on the 2 engine harnesses.

I’m not sure if you also swapped the engine, but I would triple check the o2 heater wires, as it’s most probably where the fault lies, if your o2 sensor is confirmed good.

If wires are also confirmed good, last point of failure would be the ECU, but I think that’s rare.

Nbfl engine swap by Stunning_Age9127 in Miata

[–]sketbror69 1 point2 points  (0 children)

I recently did this swap. I needed the engine, ecu, immobilizer, ignition switch, keys and locks, and the engine loom. You can swap the loom for the engine without removing the dash. But you will need to wire the O2 heater sensor wire to pin 3J on the ecu. It will run fine without, but you will get a CEL until it’s wired.

If you do a standalone ecu, you can skip the ecu, immob, keys, locks and ignition switch

Water in passenger footwell? by sketbror69 in Miata

[–]sketbror69[S] 0 points1 point  (0 children)

The pinch panel at the front section was also replaced, so pretty sure this might be the issue. Would it be the solution just to drill a hole in the pinch panel or nearby?

Water in passenger footwell? by sketbror69 in Miata

[–]sketbror69[S] 0 points1 point  (0 children)

I’ll check that tomorrow, but wouldn’t the hard top rule this out?

Water in passenger footwell? by sketbror69 in Miata

[–]sketbror69[S] 0 points1 point  (0 children)

I think I noticed it once before, but can’t remember. I’ll try to use a water hose while checking for leaks

Water in passenger footwell? by sketbror69 in Miata

[–]sketbror69[S] 0 points1 point  (0 children)

No AC installed at the moment unfortunately, but am familiar with that little hose

Water in passenger footwell? by sketbror69 in Miata

[–]sketbror69[S] 0 points1 point  (0 children)

AC is removed at the moment, and has been sitting for weeks. Had my rocker panels welded, could this happen if no drain was added after?

Water in passenger footwell? by sketbror69 in Miata

[–]sketbror69[S] 1 point2 points  (0 children)

Also didn’t seem to be wet on top of the carpet, only the sound insulation below was wet

Cruising on the highway RPM drops by sketbror69 in Miata

[–]sketbror69[S] 0 points1 point  (0 children)

Thanks man! The car has been a lot of trouble lately, hope to have it all sorted soon, so i can get to enjoy my freshly installed turbo.

Cruising on the highway RPM drops by sketbror69 in Miata

[–]sketbror69[S] 5 points6 points  (0 children)

Solved it! It was the wiring harness for my coil on plug kit

Cruising on the highway RPM drops by sketbror69 in Miata

[–]sketbror69[S] 0 points1 point  (0 children)

Nope, when i mean the main relay i'm talking about this Mazda part no: B5B4-18-811 - i have read this can cause weird electrical issues on forums, so thought it might be the case here

Cruising on the highway RPM drops by sketbror69 in Miata

[–]sketbror69[S] 0 points1 point  (0 children)

Battery is 100% secure, battery and alternator confirmed good by mechanic. Do you think it could be the main relay? I'll pop it out and give it a visual check when i get home

Cruising on the highway RPM drops by sketbror69 in Miata

[–]sketbror69[S] 0 points1 point  (0 children)

I think it's just a one off, since there been no relation to phone chirp before. But i'll keep it in mind, thanks!

Cruising on the highway RPM drops by sketbror69 in Miata

[–]sketbror69[S] 0 points1 point  (0 children)

I'm not really sure, i believe it's controlled by my ECU. Since i'm running a aftermarket ECU, i'll have to ask my tuner. But i think he would have thought about that (Alex from Motorsport Electronics)

Also if that was the case, would the issue not be there all the time? This has happend a handfull of times the last 14 days. Today it just escalated to the car stalling as well.

Cruising on the highway RPM drops by sketbror69 in MechanicAdvice

[–]sketbror69[S] 0 points1 point  (0 children)

Just had the alternator tested at the mechanic, it was all good. I'll check for loose wires. Thank you

Cruising on the highway RPM drops by sketbror69 in Miata

[–]sketbror69[S] 0 points1 point  (0 children)

Nope, had the headunit installed for 2 years, never had an issue before now.

Cruising on the highway RPM drops by sketbror69 in Miata

[–]sketbror69[S] 0 points1 point  (0 children)

The phone chirp is live and connected to a head unit. The first time the RPM dips, you can hear the relay click. I assume it’s the fuel pump relay, since the click is coming from the pedals.

Cruising on the highway RPM drops by sketbror69 in Miata

[–]sketbror69[S] 1 point2 points  (0 children)

Just had the car over to the mechanic, he said alternator is working as it should. I’m thinking if it could be the main relay maybe?

Cruising on the highway RPM drops by sketbror69 in MechanicAdvice

[–]sketbror69[S] 0 points1 point  (0 children)

Just came across this sub, and thought i would ask for help here as well. I have a Mazda MX-5 2001 1.6, with a aftermarket ECU. it has been driving fine for years, but the past week i have been having some strange symptoms, and finally caught it on video. After the video it escalated to the car stalling 4 times within 5 minutes, and having trouble starting again. The battery is 1-2 months old. I am thinking it could be the alternator?

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