What's new
Peugeot RCZ Forum

Register a free account today to become a member. It's free! Once signed in, you'll be able to participate on this site by adding your own topics and posts, connect with other members through your own private inbox and take part in competitions!

Intermittent Rail P0087 Fuel Rail/System Pressure Too Low - Fixed

lucy.basten

New Member
Joined
Oct 17, 2019
Messages
19
Reaction score
7
Points
3
Hi There,
I have a 2013 RCZ, recently had an issue with it on cold start in the morning, was juddering and throwing a misfire error code as well as the Rail P0087 Fuel Rail/System Pressure Too Low code. The issue only happened on startup in the morning from cold and if you turned the engine of and restarted it, the engine ran fine. The car has been into the garage, and had all coil packs replaced, new spark plugs, new rail pressure sensor.

The car is now not juddering on startup anymore but randomly throws up the Intermittent Rail P0087 Fuel Rail/System Pressure Too Low error, engine light comes on and when you accelerate its like there is no power. Has now thrown up a P1338, P1340, P1336, P0087 error and the fan came on. Turned the engine off and restarted and was fine and has driven 80 miles.

Car been booked back into the garage tomorrow, but just wondering if anyone knows what the problem could be? Currently the engine light has turned itself out.
 

lucy.basten

New Member
Joined
Oct 17, 2019
Messages
19
Reaction score
7
Points
3
Thanks everyone, it's being looked at today but I suspect the HPFP
 

lucy.basten

New Member
Joined
Oct 17, 2019
Messages
19
Reaction score
7
Points
3
Little update on the car, garage suspected ECU issue as the issue was so random. ECU has been tested and repaired and car drove like a dream for 3 days. Random misfire and loss of power whilst driving throughout the week. As soon as you turn the engine off and back on the car is fine. ECU flagged up that injector number 4 was at the 7000 tolerance which is the end scale of the tolerance. The garage have tested the HFPF and said it’s fine.

garage have looked at the live data and the injector issue jumps between all 4 injectors and all cyclindefs when there is a misfire and shows a different cylinder and injector each time.

does anyone have any ideas, could it be the injector? It’s so annoying, the issue is so intermittent.
 

DKZ5745

Well-Known Member
Joined
Sep 7, 2014
Messages
5,094
Reaction score
562
Points
113
Location
Yorkshire
My first thoughts would be coil pack(s) or HPFP.
Your symptoms sound very similar to mine a couple of years ago. I replaced all coil packs & plugs, which seemed to do the trick, but then a very short time later the misfire was back (intermittent). New HPFP & fuel rail under extended warranty drives better than it did from new now 👍
 

lucy.basten

New Member
Joined
Oct 17, 2019
Messages
19
Reaction score
7
Points
3
My first thoughts would be coil pack(s) or HPFP.
Your symptoms sound very similar to mine a couple of years ago. I replaced all coil packs & plugs, which seemed to do the trick, but then a very short time later the misfire was back (intermittent). New HPFP & fuel rail under extended warranty drives better than it did from new now 👍
Thank you for this :) The coil packs were all replaced last month and plugs. I will call the garage tomorrow and enquire about the HFPF and the rail, he did say he tested the pressure in the pump and was showing as 50, i dunno what that means but he said it was fine ;/
 

DKZ5745

Well-Known Member
Joined
Sep 7, 2014
Messages
5,094
Reaction score
562
Points
113
Location
Yorkshire
Problem is, with an intermittent misfire, it’s likely that the pump will be putting out the correct fuel pressure some of the time. It’s not that it’s failed, more that it’s failing.
I can’t guarantee that replacing it will solve the problem, but I would be surprised if it didn’t.
 

lucy.basten

New Member
Joined
Oct 17, 2019
Messages
19
Reaction score
7
Points
3
Yeah that makes sense - thank you. I fully expected it to be the HPFP when I took the garage in a month ago, and I mentioned it when I took it in that it was likely to be that after doing lots of research, as I know they suffer with them. But the garage said it was unlikely, I will call them again in the morning and discuss it. Do you know how much it costs to replace the fuel pump, I'm tempted just to tell them to go ahead with it.
 

DKZ5745

Well-Known Member
Joined
Sep 7, 2014
Messages
5,094
Reaction score
562
Points
113
Location
Yorkshire
It’s not the cheapest repair unfortunately. Probably round the £600 mark. I didn’t have to pay for mine doing as I had a Peugeout Platinum extended warranty at the time. I think the dealer charged the warranty people a lot more than that.

Maybe someone who has had theirs done & paid for it themselves will be along soon & have a better idea of costs.
 

lucy.basten

New Member
Joined
Oct 17, 2019
Messages
19
Reaction score
7
Points
3
It’s not the cheapest repair unfortunately. Probably round the £600 mark. I didn’t have to pay for mine doing as I had a Peugeout Platinum extended warranty at the time. I think the dealer charged the warranty people a lot more than that.

Maybe someone who has had theirs done & paid for it themselves will be along soon & have a better idea of costs.
Thanks you so much for all your help :)
 

neilgsxr69

Moderator
Staff member
Joined
May 7, 2014
Messages
3,204
Reaction score
720
Points
113
Little update on the car, garage suspected ECU issue as the issue was so random. ECU has been tested and repaired and car drove like a dream for 3 days. Random misfire and loss of power whilst driving throughout the week. As soon as you turn the engine off and back on the car is fine. ECU flagged up that injector number 4 was at the 7000 tolerance which is the end scale of the tolerance. The garage have tested the HFPF and said it’s fine.

garage have looked at the live data and the injector issue jumps between all 4 injectors and all cyclindefs when there is a misfire and shows a different cylinder and injector each time.

does anyone have any ideas, could it be the injector? It’s so annoying, the issue is so intermittent.
This is such a common post, for some reason mechanics constantly miss diagnose the HPFP failing because it throws up so many spurious faults. That’s why these cars get so much flack for expensive repairs and numerous faults, time and time again garages are changing coil packs, plugs, sensors etc looking back at years of posts when the pump starts failing it’s just the odd fault code relating to missfire or fuel rail pressure then the car can run perfectly for weeks then another fault and it gradually gets worse but by this time owners have spent a small fortune in diagnostics and parts they didn’t need, a pump can be bought for around £350 and one and a half hours labour.
 

Pedro

Well-Known Member
Joined
Jan 16, 2020
Messages
2,561
Reaction score
801
Points
113
Location
Cheshire
This fault is relative easy to pin down if you know how step 1/ Plug in scanner to obd. port ..step 2/ scan car for any codes.. step 3/ scroll into fuel rail system in scanners diagnostic freeze frame menu.. step 4/take car for a 2-3 klm run whilst the scanner measures the high/low fuel trims if pressure drops whilst engine is under load the HPFP is probably 100% failing as it cannot meet the ECU demand for fuel pressure to be increased with engine speeds
 

lucy.basten

New Member
Joined
Oct 17, 2019
Messages
19
Reaction score
7
Points
3
Little update on the car. Asked the garage to check the HPFP. The garage tested the fuel pump and determined it was the LPFP over the HFPF. The camshaft sensor was also replaced. Picked up the car, drove it out of the garage and engine light came on with all the same symptoms.

The car went straight back in to the garage. They Have since had a electrician to look at it to rule out any electrical issue. Electrician said it could be ECU so it was sent away for repair again. They found no fault with the ECU.

Car is currently showing the same misfire codes, the P0087 and the addition of a new P0172 - rich fuel fault.

I have attached an image of the injector live data as injector 3 and 4 seem be very varied in timings.

I’m assuming at this point it’s either the HPFP as suggested originally or the injectors. Could anyone just clarify if that’s along the right lines?

The car has been in and out of the garage since January, so I’m loosing my patience with this situation at the moment.
 

Attachments

  • 0440D08D-1BB2-432E-BABB-67D47EFA9636.jpeg
    0440D08D-1BB2-432E-BABB-67D47EFA9636.jpeg
    51.1 KB · Views: 13

Nemi

Active Member
Joined
Jun 30, 2017
Messages
342
Reaction score
76
Points
28
Location
Lithuania
When I had this problem, my mechanic said that it is probably LPFL or some relay. He also checked live data on fuel pressure and found nothing bad. Since HPFP is a common issue on RCZ, I insisted that HPFP should be replaced first before trying anything else. After HPFP replacement, the issue was fixed :rolleyes:
 

Pedro

Well-Known Member
Joined
Jan 16, 2020
Messages
2,561
Reaction score
801
Points
113
Location
Cheshire
How a Electrician can say a fuel pressure fault is the ECU is beyond me the codes tell the story of what to check out & if they charged you for the ECU test check ask for your money back!
P0172 System too rich Bank 1- P0087 Fuel rail pressure Too low usually associated with a failing HPFP thus injectors will struggle to maintain pressure if the fuel rail has low pressure very rarely its the fault of the fuel tank delivery as this is only a "pick up strainer system" in the tank itself unless the car has been filled with contaminated fuel ?
A misfire can also be caused low fuel delivery when accelerating again attributed to low fuel pressure
Rich fuel fault means possibly upstream Lambda sensor has detected over fueling triggering Engine light you need to monitor the fuel trims & the best way is when the car is running with scanner plugged in monitoring the live fuel rail pressure
 

Flanners

Active Member
Joined
May 8, 2019
Messages
516
Reaction score
204
Points
43
Location
Kent
I hope OP you are not being fleeced for their pantomime....even a bunch of numpties could have searched google and ascertained that the RCZ suffers with HPFP failure and that they have the main symptoms displayed in front of them. but they seem to want to go on a needless and expensive journey into a financial and electrical black hole......hope you get it sorted and would suggest not returning to them ever again.
 

lucy.basten

New Member
Joined
Oct 17, 2019
Messages
19
Reaction score
7
Points
3
@Pedro no contaminated fuel no. Thanks for all your advice and @Flanners, I will speak to the garage today. Think I will just bite the bullet and insist on the HPFP being replace if it's not that then I will just swallow the cost on that.
 
Top