2019 Accent fuel issues

themadgrenadier_182103
Sun, 28 Aug 2022 15:10:26 +0000
Maintenance/Repairs

2019 Accent with 6spd manual just under 79,000 miles.

A few months and likely a few thousand miles ago I noticed the engine stumbled and had no power when I tried to open the throttle going slightly downhill at 30-40 MPH. I downshifted and it went completely back to normal so I shrugged and went about my life.

Coming in to work thursday on an interstate the engine light started flashing but I didn’t feel or notice any issues, I backed off and it the light went out and all seemed normal. For another 10 miles I didn’t notice an issue but after getting onto a back road I noticed it running really rough at lower rpms. Anything below 3K was pretty bad but above at light load seemed alright.

I made it to work by going easy on it and staying in a lower gear and going easy. When I parked I opened the door at work to give a listen and could smell unburned fuel so I assumed a cylinder wasn’t firing.

I replaced all 4 spark plugs and 1 coil during lunch as the computer gave me a misfire on cyl 1 code at that time. No dice. No change at all.

Now I have multiple misfire codes as well P0191 and P016F and my Ultragage is showing the fuel rail pressure between 40 and 50 PSI. I used to run around 800 PSI idling, 2800 under load.

The car starts completely normal, but dies a few times shortly after until it gets a little warmed up, then it seems to idle ok but you can’t open the throttle much at all.

I replaced the HP pump this morning. Still no change. I did notice the FR pressure is between 40-50 PSI idling, but I slowly brought it up to 2K RPM and the FR pressure climbed to 60 PSI and didn’t drop when I tried to open the throttle rapidly making it bog / die.

I’m using an Ultragage which is all I have to read OBD2.

Right now I’m at a loss. It appears the FR sensor is changing some and working and it’s matching what I’d expect the tank pump to feed but it seems almost like the computer isn’t controlling the solenoid on the HP pump at all

Is it likely the computer has locked out the high pressure pump for some reason and if so, why?

17 posts - 5 participants