Air in Fuel Filter? throwing code 77 P7 - Nissan-Navara.net
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post #1 of 18 (permalink) Old 23-04-19, 07:54 PM Thread Starter
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Air in Fuel Filter? throwing code 77 P7

Hey all,
First real problem with my Navara. Bought at 65k, it drove spot on for 3000 miles, then the engine light started flashing towing a trailer uphill on the M6, and the engine started making an awful noise. I shut it off, fearing the worst (you know what I'm talking about) but after a good look it hadn't launched a rod through the block, so started and it drove fine, with no noise, for 1/2 mile to the next junction, where I left it and picked it up with the big trailer.
Took it to a nissan specialist (who was very good), where it was already booked in to do the bottom end. He read the code (fuel timing) put a new diesel filter on it and ran a load of diesel system cleaner through it, as well as put a fair couple of miles on it, which to solved it.

400 miles later I'm driving down the M6 again (no trailer this time), and it happens again. Check Engine Light flashes, engine sounds like a bag of spanners, and it won't do over 60mph. Drove home the back way, stopping about every 30 minutes when the CEL came on.
Code read this morning as 77 P7 Fuel Timing Control. Drove absolutely fine locally today. Priming it though, it does sound like there is air in the system for the first few pumps after a drive.



I picked up a new filter today, so am going to pull the filter tomorrow to see if it is full of **** again, as well as go through the lines for obvious faults. Otherwise, are there any other areas to look at? Most posts on this forum and elsewhere point to either the filter, or the injection pump (please no...).
I have access to a two poster lift, so can drop the tank if need be.
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post #2 of 18 (permalink) Old 23-04-19, 08:24 PM
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I wonder if you have picked up some contaminated fuel?
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post #3 of 18 (permalink) Old 23-04-19, 09:28 PM
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I had this code with very small hole on main fuel line at tank.
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post #4 of 18 (permalink) Old 29-04-19, 05:45 PM Thread Starter
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Thanks guys.
I was running fuel from a small, unbranded fuel station at the time, and looking back through my reciepts I have filled up there one other time - around the time it last acted up...
Managed to borrow a van for the weekend so haven't driven it yet. I'm going to fill up with the good stuff, as well as some diesel cleaner, change the filter and have a belt up and down the A road a few times to blow its nose out. Then check all the lines and filter to see if any air is getting in.
I'd be sceptical that bad fuel would cause this much of a problem, but may well exacerbate another problem.


Will keep you updated.
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post #5 of 18 (permalink) Old 29-04-19, 06:27 PM
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"Bad fuel" is often cited as a possible cause of problems, but I wonder how often this is proven to be a root cause especially in the UK/EU?
I suspect it is pretty rare, despite hysterical newspaper reports.

This may be the problem in your case, and there are loads of things that can go wrong that are more likely.

I assume your truck is bog-standard - chips and remaps have caused problems for many who tow (DPF and/or EGR) - this is becoming a well-known thing.

The "bag of spanners" noise is interesting as it seems that is not a mechanical cause (i.e. it comes and goes you said!) - so I am not sure if it implies injector, or general fueling/air leak/pressure loss, or boost solenoid/boost pressure/turbo issues as all (apart from a dodgy injector) seem to usually lead to power and smoke problems but not necessarily scary noises.

I don't know what the code is, but strange things can happen when the crank position sensor plays up.

Is the timing chain OK?
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Last edited by freemansteve; 29-04-19 at 06:31 PM.
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post #6 of 18 (permalink) Old 29-04-19, 10:31 PM Thread Starter
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Yes I don't suspect bad fuel to be the root cause, quality control on fuel in the UK is pretty strict, but you never know if a smaller station is keeping on top of its own filter changes etc. Which is why I think some lower quality diesel is probably revealing an underlying problem.
Truck is bog standard save for the bearing mod. EGR, fuel pump, cat etc. haven't been touched.
There is definitely a lot of noise, and definitely no smoke. Temperature gauage also stays stable.
I didn't think D22s really had timing chain issues, especially below 70k miles?
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post #7 of 18 (permalink) Old 30-04-19, 07:41 AM
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Your correct D22 timing chain setup if bomb proof left alone. ( Its the D22 chain that is the upgrade on the D40) besides if it was the timing problem, I doubt your problem would be intermittent.
Nor do they have a DPF

Have you found any debris/water in the fuel filter at all.

I had an intermittent issue with my previous Pathfinder, went through the fuel system, I had air getting in from the injector leak off pipework, also found this black type slime on the pick up filter inside the fuel tank.
The fuel delivery pipe from the tank was under too much vacuum caused by the blind tank filter, air was getting sucked in at any weak point.

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post #8 of 18 (permalink) Old 30-04-19, 11:43 PM
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Quote:
Originally Posted by diydave View Post
Your correct D22 timing chain setup if bomb proof left alone. ( Its the D22 chain that is the upgrade on the D40) besides if it was the timing problem, I doubt your problem would be intermittent.
Nor do they have a DPF

Have you found any debris/water in the fuel filter at all.

I had an intermittent issue with my previous Pathfinder, went through the fuel system, I had air getting in from the injector leak off pipework, also found this black type slime on the pick up filter inside the fuel tank.
The fuel delivery pipe from the tank was under too much vacuum caused by the blind tank filter, air was getting sucked in at any weak point.
The black slime you describe is an issue with modern diesel fuel and is caused by bacteria acting on the biodiesel content within fuel . We have to use special additives in the tank with any machinery that sits idle for any length of time. The bio diesel content sucks in a lot of water .
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Last edited by popsdosh; 30-04-19 at 11:45 PM.
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post #9 of 18 (permalink) Old 08-05-19, 10:46 AM Thread Starter
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Quote:
Originally Posted by popsdosh View Post
We have to use special additives in the tank with any machinery that sits idle for any length of time. .
Exocet?


Finally got the truck on a lift yesterday evening. Unfortunately can't see anything obvious.
It's nearly empty now so I think it's a good time to drop the tank and have a look.


Apart from the fuel strainer, is the in-tank unit known to give problems?
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post #10 of 18 (permalink) Old 19-05-19, 07:45 PM Thread Starter
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Update:
The service manual states reasons for code 0707 P7 as:
Harness or Connectors
Electronic Control Fuel Injection Pump
Improper Fuel Quality

I ran it out as much as I could, then dropped the tank, hoping for a bit of improper quality fuel. It wasn’t bad at all, with just a small amount of black floating around (fingerprints mine).




I pulled the filter (400 miles old), which had nice, clean diesel, but also a couple of big chunks of gunge.








Now. I disconnected the fuel lines at the filter, attached a water bottle with holes drilled in it to the tank end, and blew them out with a compressor. And this is what came out of the main fuel line.




Quite a difference. It was as opaque in real life as it looks in the pictures, and a lot more jet black diesel ended up on the garage floor. I blew the thinner pump return line out into a rag, and it was pretty much pure black solids with a little liquid.


After refitting the tank, replacing the rubber pipes at the tank, half filling it with new, name brand diesel and Exocet diesel anti-bug, it was primed up and taken for a good, hour long blast up and down the A-roads to blow its nose out, which went without a hiccup. I wouldn’t say it has added any power, but the engine now seems a lot happier at the top end.


So, I’d say blocked up fuel lines were my problem. I’m still going to put a few hundred local miles on before venturing too far, hoping that no permanent damage has been done to the pump. Of course using a regimen of quality diesel and bug-killer.
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