Low fuel rail pressure p0087, fixed itself, any ideas - Unofficial Honda FIT Forums


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Old 07-11-2018, 02:51 PM
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Low fuel rail pressure p0087, fixed itself, any ideas

Car went into limp mode the other day. Engine lights on etc. Girlfriend got towed home by AAA.

Torque app showed P0087. Fuel rail showed about 36psi give or take. I pulled out the in tank pump, took it apart, no signs of anything clogged, seems to pump fine using isopropyl and then gas.

Reinstalled the pump, cleared the code, started the car and burped the throttle a couple of times. Rail pressure was 500psi at idle, jumping to 750 to 1000 as the revs picked up.

Has anyone worked on the direct injection systems on these cars? Nobody likes a problem that magically fixes itself.

Will do a test drive in a couple hours.

Any input would be appreciated, thanks
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Old 07-11-2018, 07:26 PM
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Code sets when the high pressure pump can't build sufficient pressure in the fuel rail, or sensor readings indicate to the PCM that situation may have occurred.


Got freeze frame data you can post?

If it runs out of gas and the engine stalled because of it, it will definitely set the code.

If it's very low on gas it could happen if the in-tank pump cavitates or starves long enough to interrupt the supply to the HP pump and rail pressure drops (below a threshold) for longer than about 3 seconds.


If either of these could have been the case, just add more fuel, clear the codes and drive it.



If you saw 36 psi with just the key on and the in-tank pump ran its 2 second prime, that's probably normal until you start the engine and the HP pump can build pressure.

Yea, intermittent issues can really suck to figure out if it's not acting up while you're checking it out, especially when it's a real problem.



HTH
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Old 07-12-2018, 12:06 AM
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I saw 36psi with the car running at idle in my driveway.
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Old 07-12-2018, 12:11 AM
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Quote:
Originally Posted by andy342 View Post
I saw 36psi with the car running at idle in my driveway.
Well that isn't right, but getting it to act up again long enough to figure out what's going on will be the hard part.



Still under warranty?


If you erased the codes they won't have anything at all to work with. It will have to set the code again.
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Old Today, 08:12 PM
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Maybe it's just a hiccup. The fuel pump you took out is probably the low pressure pump. I ran out of gas once ... no codes thrown.
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