jimmyk
Member Since: 28 Jun 2020
Location: Yorkshire
Posts: 14
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Low pressure fuel pump problems |
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Hi Guys,
I am new to the site so please excuse me if I have done this incorrectly!!
I have a problem with a Discovery 3. I bought the car around a month ago and discovered that it had had an engine replacement after re- seating a blowing injector. As the car did not have full history anyway, I decided to have belts and Oil pump done at a local specialist as much for insurance after having read all the horror stories, plus the fact that I don't know much about the exchange engine other than its from a a land rover and it had been "thrown in" by the looks of the quality of the fitting. After I had the belts done I decided it was safe to do a reasonable journey and drove the car to see my daughter in Manchester, a round trip of about 160 miles. The car drove fine without any issues and I returned home without any problems. The next morning I jumped in to start, but the car just kept turning over without firing. Then I noticed the Engine system fault on the dash. The car had no issue before but it wouldn't start but after looking through your forum and with some advice from my LR specialist, it seems the most likely thing is the low pressure fuel pump. I have tested the voltage and current across the relay and am getting around 4.23 amps, however, I think its had the tank off before and maybe had a pump already. if I bridge the Positive and neg terminals on the relay fitting I can get the pump to run and it chucks fuel out of the bleed valve on the engine. My question to you really is: could this be anything other than the pump, Is it worth changing the filter, and could I try to start the car by bridging the relay contacts then removing the bridge once the car is running to try and get it started and then take it somewhere to be fixed? Sorry for rambling on but any help or advice would be appreciated. Thanks
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29th Jun 2020 3:39 pm |
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Flack
Member Since: 06 Sep 2006
Location: Preston Lancashire
Posts: 6224
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Quote:I try to start the car by bridging the relay contacts then removing the bridge once the car is running
Are you saying it runs when yo u do this ?. Or it does not run at all.
Flack
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29th Jun 2020 4:11 pm |
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jimmyk
Member Since: 28 Jun 2020
Location: Yorkshire
Posts: 14
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Hi Flack,
Thanks for your reply. No I haven't tried to start this way, I just did it to see if the pump would run diesel to the bleed valve. is it possible to do this to get the car started?
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29th Jun 2020 4:14 pm |
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Flack
Member Since: 06 Sep 2006
Location: Preston Lancashire
Posts: 6224
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You need to get a gauge on the bleed valve and see what pressure is there, it should be around 5 to 7 psi.
The intank fuel pump will not put the EMl light on, check and make sure both belts are turning ?.
Everything is controlled by PCM Ecu.
Flack
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29th Jun 2020 5:57 pm |
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jimmyk
Member Since: 28 Jun 2020
Location: Yorkshire
Posts: 14
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Hi Flack,
Thanks for that, I will check the pressure, but which belts do you mean?
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29th Jun 2020 6:50 pm |
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Flack
Member Since: 06 Sep 2006
Location: Preston Lancashire
Posts: 6224
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Both Cambelts.
Flack
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29th Jun 2020 7:39 pm |
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gearmuncher
Member Since: 30 Oct 2018
Location: Woodley
Posts: 143
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what are the codes logged.
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29th Jun 2020 7:39 pm |
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jimmyk
Member Since: 28 Jun 2020
Location: Yorkshire
Posts: 14
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Hi gearmuncher,
Unfortunately my code reader is knackered so don't have anything at the moment. I borrowed a mates Mickey mouse one but it wouldn't even communicate with the car.
I'm going to try to get something tomorrow and then I will post the results.
Thanks, James
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29th Jun 2020 8:01 pm |
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jimmyk
Member Since: 28 Jun 2020
Location: Yorkshire
Posts: 14
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Thanks Flack,
Hope not after they have just been changed
Anyway, I assume a code reader will bring something up if that's the case?
Thanks again, James
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29th Jun 2020 8:04 pm |
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gearmuncher
Member Since: 30 Oct 2018
Location: Woodley
Posts: 143
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yep, I think you are barking up the wrong tree with the low pressure pump.
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29th Jun 2020 8:10 pm |
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jimmyk
Member Since: 28 Jun 2020
Location: Yorkshire
Posts: 14
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Hi Guys,
Just a bit of an update really.
I have borrowed a slightly better Diag to try today but with not much more success. I did get a P062E code but I think that must have been the blowing injector. I managed to speak to someone at the LR specialists who said that if I could bridge the relay, I should try to start it, but to be honest I'm not happy, just in case the belt has slipped. I asked a mechanic friend to call and have a look and he says that he doesn't think its the LPFP and also said not to risk starting until the codes have been read properly. I am just waiting for the new diag equipment to arrive then I will do a full scan, or I am going to ask the specialist to see if they can pop pout and plug it in.
Anyway, Ill keep you posted as to my progress
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30th Jun 2020 5:09 pm |
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jimmyk
Member Since: 28 Jun 2020
Location: Yorkshire
Posts: 14
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Hi all,
I have eventually managed to replace my code readers and plugged into the Discovery today.
I have attached the list of codes it came up with but there are two particular ones on the engine (P0630 and P062E) the first of which I think it my problem!!
It says Vin Not Programmed or Incompatible ECM/PCM
The other relate to injector driver circuit performance which I dont think would stop the engine from starting?
I have put a better battery plus jump pack on in case it could be voltage related but doesn't make any difference.
Any help or guidance would be appreciated!!
Thanks, James
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3rd Jul 2020 4:39 pm |
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lynalldiscovery
Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274
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If you have the code number, a search is often much quicker, and will yeald much reading.
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3rd Jul 2020 8:54 pm |
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jimmyk
Member Since: 28 Jun 2020
Location: Yorkshire
Posts: 14
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Hi all,
Just to let you know: I cant upload the file that shows all the codes on the car as it was saved as an XPs document and it wont let me upload.
Going to try and get it into a different format and post it as soon as I can.
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3rd Jul 2020 9:21 pm |
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jimmyk
Member Since: 28 Jun 2020
Location: Yorkshire
Posts: 14
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Seems to be an injector problem |
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Hi Guys,
Just an update if anybody hasn't lost interest in my numerous waffelings on
I have been outside with the Discovery this morning testing and checking all fuses looking for possible wiring issues and making sure my battery was fully charged.
I was jut about to give up when I thought I would disconnect all the injector connections on Bank 2 (left hand side)
To my amazement the car fired
I then re connected the injectors one by one and every time it fired until reached the injector I had removed and re-sealed Rear injector bank 2 rear injector which I think is cylinder 6 in the firing order.
If I connect this injector the car wont fire but if its disconnected it will fire and run on 5 cylinders but the engine stystem fault still comes up on the dash?
Any ideas??
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4th Jul 2020 1:21 pm |
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