Hey guys, I was wanting some advice on this issue before I start throwing more money and parts at the problem. Car is a 2006, completely stock other than an Accessport with the Cobb Stage 0 tune on it. TLDR version: Car threw code P0192, I put in new Fuel Rail Pressure Sensor, now it runs but won't go over 1456 PSI.
Last week I had the AP hooked up to monitor the health since I was planning on buying some HPFP internals, and intake, and a tune in the near future. For funsies I swapped over to the Cobb Stage 1 map, and when I was testing max boost in 3rd gear the car threw a check engine light, and I drove home and checked what the code was for. P0192, fuel pressure sensor low voltage. At this point the car would crank and idle but it was really rough, and the pressure reading on the AP was 0. I reflashed the Stage 0 map just in case it was a bad flash or something, but nada.
So I order a new fuel rail pressure sensor. I got a cheap one from Amazon first but it didn't work, then I ordered the GP Sorenson one I found in a link on another thread. Put it on, cleared the code, primed the system and then the car cranked just fine after a few seconds. I drove it around gingerly with my eyes on the fuel pressure, I set the AP to display the desired fuel pressure and the actual fuel pressure, and they were pretty much in sync.
After it warmed up and I was satisfied with the pressure I started giving it some boost, and here's where the problem lies. The car's actual pressure's max was 1456. Turbo seems fine, surprisingly I didn't get any knock retard. (Thank you super rich map?) The car actually feels just fine, although I'm not boosting due to fear over the fuel pressure. I drove it quite a bit, and it was the same, I'd cruise with the fuel pressure at 1300 psi, and when I hit the gas some the desired fuel pressure would go up to 1600 or something, but the actual would never go much above 1400. Before all this the car never had any trouble keeping it with plenty of fuel on pulls, and usually maxed out around 1700 something.
I found this thread when searching, and the OP seemed to have similar issues starting at post 42: https://www.mazdaspeeds.org/index.php?threads/fueling-issues-2012-ms3.9502/ From reading that thread it looks like his fix is to replace the whole fuel rail. It seems like that will probably be my next step, but I though I'd check first for opinions before I start throwing money at it. I really don't want to have to take everything apart to install a new fuel rail, although it would give me an excuse to finally pull the injectors and get them cleaned and install some injector seals.
Last week I had the AP hooked up to monitor the health since I was planning on buying some HPFP internals, and intake, and a tune in the near future. For funsies I swapped over to the Cobb Stage 1 map, and when I was testing max boost in 3rd gear the car threw a check engine light, and I drove home and checked what the code was for. P0192, fuel pressure sensor low voltage. At this point the car would crank and idle but it was really rough, and the pressure reading on the AP was 0. I reflashed the Stage 0 map just in case it was a bad flash or something, but nada.
So I order a new fuel rail pressure sensor. I got a cheap one from Amazon first but it didn't work, then I ordered the GP Sorenson one I found in a link on another thread. Put it on, cleared the code, primed the system and then the car cranked just fine after a few seconds. I drove it around gingerly with my eyes on the fuel pressure, I set the AP to display the desired fuel pressure and the actual fuel pressure, and they were pretty much in sync.
After it warmed up and I was satisfied with the pressure I started giving it some boost, and here's where the problem lies. The car's actual pressure's max was 1456. Turbo seems fine, surprisingly I didn't get any knock retard. (Thank you super rich map?) The car actually feels just fine, although I'm not boosting due to fear over the fuel pressure. I drove it quite a bit, and it was the same, I'd cruise with the fuel pressure at 1300 psi, and when I hit the gas some the desired fuel pressure would go up to 1600 or something, but the actual would never go much above 1400. Before all this the car never had any trouble keeping it with plenty of fuel on pulls, and usually maxed out around 1700 something.
I found this thread when searching, and the OP seemed to have similar issues starting at post 42: https://www.mazdaspeeds.org/index.php?threads/fueling-issues-2012-ms3.9502/ From reading that thread it looks like his fix is to replace the whole fuel rail. It seems like that will probably be my next step, but I though I'd check first for opinions before I start throwing money at it. I really don't want to have to take everything apart to install a new fuel rail, although it would give me an excuse to finally pull the injectors and get them cleaned and install some injector seals.
