That’s why I suggested diluting the octane boost with the 94.

Octane boosters can cause damage. An example would be operating an automobile engine using aviation fuel. Aviation fuel is higher octane and contains lead. Leaded fuel will damage the catalytic converter and sensors.

I don’t recommend this snake oil for a street driven car or any car with catalytic converters!

 

K guys i got a P0087 code so im guessing it might be the fuel pressure sensor? Thats just from what ive been reading online?


Also on my rpd im getting no reading, just "dashes" on my fuel pressure guage.


I pulled both ECM fuses reset everything and my fuel pressure reading is now not going above 230 psi

 

HPFP might be toast!

 

Well that code say pressure is low, so the ECM must think the sensor is working.

First, check fuel pressure on the low side. There is no sensor. Low pressure there will starve the HPFP.

Maybe you poisoned your fuel pump.

If the low pressure side is good, you could check the high pressure side by other means if you don't belielve the RPD. The -- at the RPD suggests a bad sensor, but the reading you're getting, suggests the HPFP is adding little pressure. Oldblue is prolly right.

But I have no idea how the HPFP works or if something else could prevent higher pressure.

 

When I clear this everything and reset it the fuel pump reads 235 then it stalls out when the engine light comes on then there is just dashes in the fuel pressure reader on the RPD

 

2 fuel pumps. The electric one in the fuel tank should supply about 58 or so psi to the HPFP( high pressure fuel pump)
The HPFP is a cam drive mechanical pump at the back end of the cylinder head.
Cold start pressure should be around 2200 psi. After full warm up, idle pressure should be 400-600 or so. The readings on the RPD will be erratic and jump around (normal).

FYI. You can check the in tank fuel pressure by the RPD. Just turn the key to ON without starting the engine. When the RPD boots up it will show the tank pump pressure.

 

What I don't know is how the HPFP regulates the pressure, or even the logic of how much pressure when.

 

An article from the Cobalt site

https://www.cobaltss.net/forums/2-0l...issues-289987/

 

Thanks Blue, definitely an interesting read!! So i just went out to give it a start after its been sitting for the last 7 hours and it was hesitant, but she started and fuel pressure was reading 2000ish and was running fine at cold idle. After about a minute, pressure began to drop fast and eventually stalled out. Now it wont start at all. Its the same thing that happened last time i started it 7 hrs ago... So if i let it sit overnight and come out tomorrow morning, the same thing will happen, it will start and then bog out. Funny thing tho is the whole incident with the octane boost happened on Wednesday and ive been able to drive the car to work which is only 2km away, and around the neighborhood for the last couple days with no problems at all as long as i didnt step on it, cuz i knew already from trying earlier that when i did giv'er a bit, boost would max out around 7-8psi and you could obviously feel the lack of power. But it was still drivable, but now it wont even start unless it has scar for a few hours. And when it does start it won't run long enough to back out of the driveway. I know you guys have given me more than enough answers to possibly figure out what the problem is, I'm just giving you all updates on what's happening now. So I'm not sure why all of a sudden it won't run at all seeing is it's been drivable the last couple days since the incident to the point that it won't run at all now?

 

Oh yeah, one more thing to note, ive been driving with the traction control and ESC off. It seemed that once i turned the ESC off thats when it started running rougher. Coincidence?