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02-10-2018
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Lowranger Shocker
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Join Date: Apr 2007
Location: Dracula's next door neighbor
Age: 35
Posts: 1,609 What Jeep do I drive?: WJ
Likes: 93
Liked 231 Times in 188 Posts
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What I know for sure is that a pressure loss in the rail will promptly shut the engine off. So chances of starting or building pressure with an open fuel rail are slim.
The system is self-bleeding, it's not an old ID or DI diesel to require bleeding the fuel lines.
__________________
Quote:
Originally Posted by Barefoot
Hey I wonder what happens if I plug this wire in therAAAAAGGGGGGHHHH............
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Last edited by Adrian D; 02-10-2018 at 04:33 PM.
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02-10-2018
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Lowranger Shocker
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Join Date: Jul 2017
Location: SE Qld
Posts: 1,510 What Jeep do I drive?: WG
Likes: 172
Liked 273 Times in 220 Posts
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We are flying a bit blind here. Some of the codes listed relate to brake pedal switching. First thing I'd do is clear the lot and see which come back.
One of the codes points to the fuel rail regulating valve. This is corroborated by difficulty starting. Injectors simply refuse to fire until the ECU sees the rail as healthy.
Things that can prevent starting (given it runs once started):
ECU supply below 9v - dying battery
Fuel rail pressure not good
Too cold and glow plugs not working
Things I recommend:
Attach a voltmeter to the battery, crank and read while cranking. If much below 10V try jumpering from another vehicle.
Set yourself up with Jeep Diag Pro and monitor the fuel pressure and regulator valve position while cranking. If it doesn't climb then you have a fuel issue (pump or regulation).
Start it with a spray aid, and take it for a test drive while monitoring fuel rail measured pressure, required pressure and regulator valve position. If it is constantly closing the valve but not achieving required pressure when under load, the HP pump might be sus.
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02-10-2018
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Rock Munki
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Join Date: Aug 2009
Location: Castle Hill, NSW
Posts: 2,136 What Jeep do I drive?: WG
Likes: 11
Liked 300 Times in 245 Posts
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Quote:
Originally Posted by JeanLuke
Things that can prevent starting (given it runs once started):
ECU supply below 9v - dying battery
Fuel rail pressure not good
Too cold and glow plugs not working
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Low voltage could be the problem, I suspect fuel rail pressure isn't coming up to snuff.
Quote:
Originally Posted by JeanLuke
Things I recommend:
Attach a voltmeter to the battery, crank and read while cranking. If much below 10V try jumpering from another vehicle.
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A low quality meter may make it difficult to see a quick drop in voltage, a new battery or a jump start will help isolate this as a potential source of problems.
If it was a voltage issue I wouldn't think it would start with start ya bastard, this me me indicates a fuel rail pressure problem which is aided when the engine starts with some external assitance.
Quote:
Originally Posted by JeanLuke
Set yourself up with Jeep Diag Pro and monitor the fuel pressure and regulator valve position while cranking. If it doesn't climb then you have a fuel issue (pump or regulation).
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Good advice, spend the money on the good ELM327 from https://elm-327.eu.
Quote:
Originally Posted by JeanLuke
Start it with a spray aid, and take it for a test drive while monitoring fuel rail measured pressure, required pressure and regulator valve position. If it is constantly closing the valve but not achieving required pressure when under load, the HP pump might be sus.
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Didn't you just put a kit trough the pump? If so this may be the root cause of the problem, something may not be quite right with the pump and a new one may be required.
Jason
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02-10-2018
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Lowranger Shocker
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Join Date: Jul 2017
Location: SE Qld
Posts: 1,510 What Jeep do I drive?: WG
Likes: 172
Liked 273 Times in 220 Posts
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Quote:
Originally Posted by bodgie
Low voltage could be the problem, I suspect fuel rail pressure isn't coming up to snuff.
A low quality meter may make it difficult to see a quick drop in voltage, a new battery or a jump start will help isolate this as a potential source of problems.
If it was a voltage issue I wouldn't think it would start with start ya bastard, this me me indicates a fuel rail pressure problem which is aided when the engine starts with some external assistance
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While I think it's most likely to be fuel related, we should eliminate voltage.
It's possible that a voltage dip is killing the ECU, but when it fires with start-ya-bastard it reduces the starter current by speeding up the engine, and the alternator would spring to life, all working to increase voltage to bring the ECU back on line and allowing it to keep running.
It's all a long shot, but a simple test takes it off the table. I agree that it's more likely a fuel rail problem.
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03-10-2018
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Senior Newbie
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Join Date: Feb 2018
Location: Blue Mountains NSW
Posts: 84 What Jeep do I drive?: WG
Likes: 0
Liked 5 Times in 2 Posts
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No start
OK, thank you all for coming back to me, much appreciated. Below is the report that came back from the mechanics.
Fit Replacement Battery.
Repair and Re end battery cable connections to battery.
Replace failed starter motor assembly.
Remove seized cylinder 4 injector and dicarbon head and retaining bolt hole.
Perform engine diagnostic computer scan to test fuel system pressure and detect electrical faults, no electrical faults detected.
ITEMS REQUIRING ATTENTION.
Fuel injection pump assembly needs replacing (Low Fuel Pressure). Specifications have desired fuel pressure at 36000 KPA. Fuel pump is only delivering 182-728 KPA.
Well, that is the report but in the early hours this morning I woke up thinking about it all, (it has possessed me) and would it be the high pressure pump that is the problem as in the report they do say that diagnostic testing indicates a bad pump but, would the low pressure pump produce 182-728 KPA? Now, one thing that may or may not be important, when I replaced the o rings in the high pressure pump, I replaced everything except the part where you have to remove that tiny cir clip and pull the front of the pump out, so basically I have not even looked at that part. I will pull it of today and finish the task. Also, how would I be able to tell if the pump is cactus? I do remember that the pistons under each head had some like sort of rusty marks, probably not rust but more scoring if you know what I mean.
Rob
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03-10-2018
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Senior Newbie
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Join Date: Feb 2018
Location: Blue Mountains NSW
Posts: 84 What Jeep do I drive?: WG
Likes: 0
Liked 5 Times in 2 Posts
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Forgot to add, the battery is not a week old as yet and I have had it on the charger to make certain it is up there, so the battery is all good.
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03-10-2018
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Lowranger Shocker
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Join Date: Jul 2017
Location: SE Qld
Posts: 1,510 What Jeep do I drive?: WG
Likes: 172
Liked 273 Times in 220 Posts
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Okay - ignore my ramblings about voltage.
I think you have misunderstood your mechanic's report. I read it as saying your HP pump is only producing 182-728 kPa when it should be 36,000kPa (which is 360 bar which sounds about right). If so, then it will never fire at 728kPa (7.28 bar). It's not even close to enough.
If the pump is three-quarters dead, it is possible that when the engine kicks on start-ya-bastard (wich is effectively throwing fuel directly into the intake) it has enough speed to get the pressure above 250 bar which will allow theengine to fire up and run. As I said before, get yourself set up with the software and check the pressures yourself. The real test will be to give it a boot-full and see how the HP pump keeps up.
In fact, if the HP pump is almost dead, the engine might even stall at full noise. Have you tried it?
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