2012 speed 3 fuel pressure issue

Kim McGinnis

Kim McGinnis

Greenie N00B Member
2012 Mazdaspped3 running COBB stage2+ mods with COBB Nexgen Stage2 V450 tune.
I have a video this morning of accessport showing fuel pressure dropping out a couple minutes after start up. This happens every morning on cold start. Then throws multiple codes and check engine light.
Codes P0300 multiple missfires
P0192 Fuel rail pressure sensor circuit low input
Any help would be great,, thanks
MEDIA=youtube]id=EQTG8hS711U;t=226[/MEDIA]be
I also have the log file from this morning if that helps
 

Attachments

Last edited:
Per the log, the misfires and rail pressure issues are likely related. Either electrical issue or dying sensor.
If you elect to replace the sensor, use an OEM one to avoid the pressure being off.

Otherwise, check for issues with the connector and pinches/exposed sections of the wiring in the engine bay. IIRC, the sensor is on the passenger side of the fuel rail.
 
Enki said:
Per the log, the misfires and rail pressure issues are likely related. Either electrical issue or dying sensor.
If you elect to replace the sensor, use an OEM one to avoid the pressure being off.

Otherwise, check for issues with the connector and pinches/exposed sections of the wiring in the engine bay. IIRC, the sensor is on the passenger side of the fuel rail.
Click to expand...

Thanks for the input. I have ordered the pressure sensor 5006/5053 from a vender here in Newark . Seems like the best place to start. We changed the plugs last weekend because of the missfire code. A lot of carbon on the old ones. On start up test this morning the sensor was stuck at 0, then the engine died and shot out the low pressure codes once again. I cleared them and restarted the car, the gage never went over 0 but the engine did stay running so obviously still getting fuel . Probably flooding though, trying to compensate for the sensor.
 
Don't lose those old plugs, they are probably still good. If you look at the log, you'll see that the AFRs go haywire when the rail pressure sensor drops out; you can have both lean and rich misfires.

Those older plugs are probably fine and just need a good WOT pull to clean them up, when the issue is fixed.
 
You must log in or register to reply here.
Back
Top