Member Since: 11 Sep 2018
Location: Cardiff
Posts: 73
Low fuel pressure, oil or electrical?
I'm still trying to figure out what exactly is going on with my car. It will flash up 'transmission fault', 'limited gears', 'HDC fault', etc, then go into limp mode. Restart clears it and I've been monitoring the fault codes.
It has a new battery, rear brake light switch, rear brake bulbs (LR part), and fuel filter (LR part). One rear brake bulb had blown and the other was burnt and so I had hoped it was that, but seemingly not.
Initially, I had 'P0087 - Fuel rail/system pressure', but that has never come back. Now I have 'P2270 - Injector control pressure too low' and, once, 'P0101 - Mass or volume air flow circuit range/performance' with this. All these are marked as 'intermittent' faults. I think the air sensor is on the pipe leading into the air box over the engine and that all seems fine. The car starts without issue and will always drive at least 20 miles before any problems.
The only other thing is that the car pulls to the left slightly and some have suggested it could be the steering angle sensor causing this, but not checked that yet. I've also just noticed a small oil leak from somewhere in the engine. The obvious thing is the LPFP and I did try to measure the current on it across the fuse, but it was around 0.7 to 1 amp... then again, my multimeter is not at all reliable.
Does anyone have any suggestions of anything else to try before it's sent to the garage?!
26th Sep 2020 7:06 pm
aja4x4
Member Since: 14 Apr 2019
Location: Westbury
Posts: 2459
I would buy a pressure gauge and decent multimeter and persist with checking the LPFP
26th Sep 2020 9:25 pm
Lrstaylor
Member Since: 04 Oct 2018
Location: Kent
Posts: 597
Been trying to fix this exact same fault for 5 months.......still no joy and everything you can think of has been replaced.
26th Sep 2020 10:12 pm
Lrsg
Member Since: 10 May 2020
Location: Norway
Posts: 77
If you've seen P0087 and changed the fuel filter my money is on the HPFP. Do you find that limp mode kicks in at higher speed or high revs?
27th Sep 2020 6:49 am
danrjm
Member Since: 11 Sep 2018
Location: Cardiff
Posts: 73
I know it seems a bit strange, but its more time/distance related - Doesn't matter if I'm going fast or slow, cruising or accelerating. It always happens around 20 miles or 20 minutes in which makes me suspect that its either temperature related due to warming up or electrical.
It's off to the garage at the end of the week, hoping they can figure it out as they have better tools than me!
27th Sep 2020 9:47 am
Lrsg
Member Since: 10 May 2020
Location: Norway
Posts: 77
When my HPFP was on its way out, the first 15-20 minutes were also symptom free, regardless of speed or revs. But after that time, limp mode would kick in at about 40 mph or above. Restart and all would be fine again, until reaching higher speed or revs (a steep hill might induce limp mode at a lower speed for instance). But if this does not resemble your troubles, it could of course be that something else is to blame. BTW, have you blanked the EGRs? I had much of the same happen after EGR blanking, i.e. limp mode after 10-20 mins. But after restart it would be gone until next day, so no connection with speed or revs. The fault code was P0101, and it turned out to be the electrical sensors to the EGRs causing trouble. They were left plugged in after blanking, and all I had to do was disconnect them and P0101 disappeared for good.
27th Sep 2020 10:24 am
danrjm
Member Since: 11 Sep 2018
Location: Cardiff
Posts: 73
I've not blanked the EGR, so not that.
So I managed to find a good multimeter and the LPFP current draw is 3.8 amps, but that was after I'd been driving it for about 15 mins so fuel was warm - Maybe a bit low?
Is there a quick check for the HPFP?
27th Sep 2020 1:05 pm
aja4x4
Member Since: 14 Apr 2019
Location: Westbury
Posts: 2459
HPFP pressures will be low if the LPFP pressures are low, if you have diagnostics you should be able to look at the HPFP pressures in the live values
27th Sep 2020 1:35 pm
ds23man
Member Since: 19 Jan 2013
Location: Ainum
Posts: 227
How many miles did your car? Mine is a 2007 with 300.000 km and this is the result:
Get an adaptor for the schrader valve, put a hose on it and check the output in a jerry can. I had 60 liters in the tank and it took 8 hours to pump it out with the LPFP.....
27th Sep 2020 1:52 pm
danrjm
Member Since: 11 Sep 2018
Location: Cardiff
Posts: 73
Mine is a 2008 with nearly 165,000 miles (about 260,000 km). Maybe the LPFP needs to be cleaned.
I have a diagnostics tool and, on idle, fuel pressure is around 27,000 to 28,000 kPa revving at 2,000 puts it to around 46,000 to 48,000 kPa.
27th Sep 2020 2:30 pm
ds23man
Member Since: 19 Jan 2013
Location: Ainum
Posts: 227
Idle pressure does not mean anything. My car was going in limp mode after 15-18km from cold.
27th Sep 2020 2:35 pm
Lrstaylor
Member Since: 04 Oct 2018
Location: Kent
Posts: 597
Hpfp replaced
Low pressure fuel pump replaced
Air compressor replaced
Brake light switch replaced
Rear lights swopped out
Fuel filter obviously replace with a genuin one
Fuel rail replaced
Fuel pressure sensor replaced
Injectors tested
All manor of things checked and tested no electrical faults found
All ecus working as they should
Still get random limp mode some times pulling off the driveway sometimes hours later, sometimes once sometimes several times in a few minutes
They do test us sometimes dont they
27th Sep 2020 2:40 pm
danrjm
Member Since: 11 Sep 2018
Location: Cardiff
Posts: 73
That's what I'm doing really... spending my time going through all the things that need to be sorted on the car so it'll run without problems. I didn't drive it much during lockdown and it seems to have suffered.
It's annoying because it works perfectly fine until that fault pops up!
27th Sep 2020 4:01 pm
danrjm
Member Since: 11 Sep 2018
Location: Cardiff
Posts: 73
If anyone is interested - Took the car to a garage and they found no problem with the fuel pressure. There was a steering sensor fault, which has been fixed, and a problem with the fuel rail and sensor, so it's having a new fuel rail and sensor next week. They said that it could also be that the high pressure fuel pump is also on its way out but to replace the rail and sensor first to see if that fixes it.
3rd Oct 2020 3:01 pm
144Saints
Member Since: 26 Dec 2020
Location: Kakamega
Posts: 4
Hi danrjm,
Any update on how this turned out? Did you manage to resolve the issue?
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