Anyone know what the pressure the 2.7 low pressure pump runs at? - Page 2 - AUSJEEPOFFROAD.COM Jeep News Australia and New Zealand


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Old 02-09-2018
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Old 30-09-2018
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Hi all,
I am ready to pull what remaining hair I have out. I simply cant start mine. 2004 grand Cherokee and I have put new filter, new orings everywhere, new battery, new starter, new injector no 4, leak test on injectors says all good, but turns over but refuses to fire. I just checked codes and have,1130,703,700,100,340, and the engine light is on.

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Rob
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Old 30-09-2018
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Hi all,
I am ready to pull what remaining hair I have out. I simply cant start mine. 2004 grand Cherokee and I have put new filter, new orings everywhere, new battery, new starter, new injector no 4, leak test on injectors says all good, but turns over but refuses to fire. I just checked codes and have,1130,703,700,100,340, and the engine light is on.

Whoever can get me going gets a gift.
Thanks,
Rob
The only code that concerns me is the 1130, no fuel pressure will be problematic.

Air in the high pressure fuel lines can cause a no starting situation as the injector won't fire. I know JL will have a problem with me saying this however, I'd be inclined to crack a high pressure line or two and crank the engine to ensure you have fuel to the injector.

Alternatively you could try a quick squirt of start ya bastard to see if it helps purge air. It should fire with this in the inlet manifold regardless of what's happening.

Jason
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Old 30-09-2018
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I know JL will have a problem with me saying this however, I'd be inclined to crack a high pressure line or two and crank the engine to ensure you have fuel to the injector.
I have a problem with this.

If you must do it, be very aware of the risks of injection injury. Google it and understand it before proceeding. Best way is to keep your body and limbs out of the engine bay while cranking, and if it does happen to fire shut it down immediately.

(I hate being so predictable!)
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Old 02-10-2018
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Hi Jason,
I have used start you bastard and it starts, however, once I stop the engine and try to restart it won't. So, the only way it will start is by helping it with a spray. Cracked an injector, and nothing there. Any suggestions?
Rob
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Old 02-10-2018
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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.
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Old 02-10-2018
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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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Quote:
Originally Posted by JeanLuke View Post
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
Low voltage could be the problem, I suspect fuel rail pressure isn't coming up to snuff.

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Originally Posted by JeanLuke View Post
Things I recommend:
Attach a voltmeter to the battery, crank and read while cranking. If much below 10V try jumpering from another vehicle.
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 View Post
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).
Good advice, spend the money on the good ELM327 from https://elm-327.eu.

Quote:
Originally Posted by JeanLuke View Post
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.
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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Quote:
Originally Posted by bodgie View Post
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
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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