P0087 Low Fuel Rail Pressure updated w/ Pictures

[D.AucoinFK7]

Car fired a p0087 the day it put a rod through the block. Assumed that it was a result of something else when the engine let go. Replaced engine with a low km unit (47k engine) out of a touring sedan.
Engine started after a long crank and idles. Idle drops after warming up like normal. Car is repeatedly getting a p0087.

injectors, fuel rail, and intake manifold all came with the engine. I did have to use the hpfp off of my old engine. After getting the code on the first start, I replaced the oem in tank pump with a dw300c. Pump primes and car starts, but I still have a longish crank and a p0087 code that returns at idle.
Hondata is showing a crazy low fuel pressure at idle (4.8kPa).
Any ideas before I replace the hpfp?

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[Zedaine]

Sounds like you’re on the right track, hpfp would be next to replace.

 

[D.AucoinFK7]

Sounds like you’re on the right track, hpfp would be next to replace.

Going to get one from a wreckers Monday hopefully. Don’t want to order new until I decide whether Im going to upgrade the fuel system or not.

 

[D.AucoinFK7]

Update: reflashed the car. It ran like shit for a few then fired the code and went into limp mode again. Checked the data logging screen on hondata and it says the fuel pressure is high when the car is off in acc mode, but while running it drops to 78psi while the ecu is commanding 29. Not sure if there’s a sensor problem or if it’s the hpfp now.

 

[Zedaine]

You brought over your HPFP from your previous engine that had the issue, so I would try that next. If it isn't that then it could be your PCM/ECU.

 

[D.AucoinFK7]

You brought over your HPFP from your previous engine that had the issue, so I would try that next. If it isn't that then it could be your PCM/ECU.

I can’t see it being a pcm/ecm issue. Just for shits I pulled the hpfp out so see I could find anything physically wrong with it. Didn’t seem to be any clear problems. I wanted to rule out the sensor on the rail being the issue, so I put it back together and changed the sensor. Exact same psi, with an immediate drop after starting it. I’ll update tomorrow if I have time to pick up a pump and install it.

 

[gtman]

Just some generic info on the possible causes for that code:

Fuel Filter issues

A crimp or restriction in the fuel supply line

A bad or failing fuel pump or fuel pump control module

Electrical problem with the low pressure fuel pump

Electrical problem with the Fuel Rail Pressure Sensor

Electrical problem with the High Pressure Pump Solenoid.

A broken or worn high pressure pump

Camshaft timing or camshaft lobe wear on the pump drive

 

[D.AucoinFK7]

Just some generic info on the possible causes for that code:

Fuel Filter issues

A crimp or restriction in the fuel supply line

A bad or failing fuel pump or fuel pump control module

Electrical problem with the low pressure fuel pump

Electrical problem with the Fuel Rail Pressure Sensor

Electrical problem with the High Pressure Pump Solenoid.

A broken or worn high pressure pump

Camshaft timing or camshaft lobe wear on the pump drive

Appreciate all the info! Any ideas on how I could check some of those things?
The in tank pump primes and holds 40ish psi at idle. The lines are all good. I was able to prime the system a few times and the rail pressure in acc mode went over 100psi. The only time there’s an issue is when the car is running. I’m assuming there’s not that much can wear at only 40-50ish km on the engine. I did have a knock sensor get blown apart when the prev engine let go. I spliced the wires back together. They’re close on the harness, is there any chance a wiring issue there could be causing an issue with the sensor??

 

[gtman]

Could it be a wiring issue? Potentially, sure yeah. These trouble codes aren't always easy to pinpoint.

 

[D.AucoinFK7]

Update. It was not the high pressure pump, unless the second hand one I got has also failed. Car still shows the same info on the data log screen. Going to start poking around the wiring and see if I can find anything.

 

[weekendwarrior44]

Update. It was not the high pressure pump, unless the second hand one I got has also failed. Car still shows the same info on the data log screen. Going to start poking around the wiring and see if I can find anything.

Did you ever find the issue? I have the EXACT problem with our tuned SI running a new deathcwerks 300. Also already replaced HPFP, Oem injectors and fuel feed line. We’re Losing fuel pressure and stalling at idle after running for a while.

 

[D.AucoinFK7]

Did you ever find the issue? I have the EXACT problem with our tuned SI running a new deathcwerks 300. Also already replaced HPFP, Oem injectors and fuel feed line. We’re Losing fuel pressure and stalling at idle after running for a while.

My mistake was a dumb one, new engine came with no high pressure fuel pump. Planned on running the high pressure pump and cam follower from my original engine because they were together since new, changed my mind and wanted to use the follower that was in the new engine and with the cam since new. Pulled the old one and went in for the night, never put one back in .

With that being said, while I was trying to diagnose it I did find out that if you pull the plug off the crank position sensor the fuel pressure sensor doesn’t give out any data. If you have a way to watch the fuel pressure (hondata, ktuner, scanner etc.) I’d look to see what the car is making for fuel pressure. If it shows the proper psi in accessory mode and then the data freezes after start up I’d look at the crank position sensor.

 

[D.AucoinFK7]

Did you ever find the issue? I have the EXACT problem with our tuned SI running a new deathcwerks 300. Also already replaced HPFP, Oem injectors and fuel feed line. We’re Losing fuel pressure and stalling at idle after running for a while.

If your fuel pressure is fine at idle, and then drops off, I’d have to guess at a problem with either the filter or the in tank pump. My car would run and idle on just the in tank. If it’s dying after that initial prime, I’d say there’s something choking the system or causing it to lose pressure. I’m no pro by any means, just some suggestions.

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