ZD30 Engine Challenge - Intermittent Power Loss

[GU3_P@trol]

I have already put a new ECU relay in (after the swap worked I wanted to make sure so purchased a new one). Battery terminals and earth points have all been scoured and cleaned.

The ECU relay is above the fuse panel on the drivers RH side. You need to remove the trim panel to get good access (it is the very top relay).

[threedogs]

So all relays are new ,battery terminals, clean, earths all re-done.
Have you tried running an extra earth from battery to body and battery to Motor??
Just throwing stuff out there

[GU3_P@trol]

threedogs - no for the extra earths but at this stage am willing to give anything a go.

More than happy for any ideas.

Cheers

[mudski]

I'd be finding out whar fault 77 is... Unless you know.

[stumpie]

A quick check run engine and move the relay side to side a few times if engine stalls spray and work in and out then try again, cant hurt and no cost.

[Yendor]

Unfortunately the saga continues and some more advice needed!!

The vehicle ran fine for a number of months and then a few weeks back went into an underground car park and up and down a few ramps then headed back up the street and lost power again and spluttered and farted and shutdown multiple times on the way home. Next day no problem but thought it might be some crap in the tank that going up and down the ramps stirred up.

So vehicle was running fine again and I pulled the tank - spotless inside except for a small piece of foil from a injector cleaner additive bottle!. Connected the tank back up and here's where the fun begins! Soon as it was started got an engine fault light (77 - P7 code) and seemed to be in limp mode with no power all the time. shutdown and restart with the same result for a number of days. Went back to the tank and pulled the vent pipes that go to and from the check valve and blew all hoses out with air. rotated the check valve a few times to clear any liquid in it. Vehicle started with no engine check light, had full power and went like a dream for a few days. Checked all forums and found nothing on anyone having trouble with the check valves and Nissan said they have hardly ever sold any ($78 each).

Coming home from the Sunshine Coast yesterday the engine check light came on (77 - P7 code) and the engine started to miss and splutter and eventually died. Pulled over, restarted - spluttered and died a few times. Let it sit for 5mins and restarted and drove home with no problem.

The missus is a most unhappy camper and I'm unsure where to go next!! Any thoughts?

DTC 707 can be set by a blocked fuel filter or air being sucked in the fuel lines.

[joejtss]

The relay swap made a marked improvement for nearly 4 months did you have any stoppages in that time?

[threedogs]

Why not replace all fuel line and return lines,
cost wouldn't be huge IMO
Then you can tick that box, one less thing

[Sir Roofy]

Any chance that theres nothing sucked into
the fuel line
the way ive read it sounds like air a bit like seals drying out
in the pump or filter it is your daily or does it sit around till the next trip

[GU3_P@trol]

Thanks for the comments all.

mudski, the 77 or P7 code is listed as F/INJ TF / B or Injection Pump injection timing control - which can be either air/contaminants in the fuel or the injector pump (or so I have been told).

Stumpie - I have either removed/replaced or wriggled that relay so many times it's not funny with no impact to the engine running!

yendor - agree and have worked really hard to ensure there are no leaks or air in the system. The fuel filter primer is really firm, and don't know how to check any other way. looking to possibly get a clear hose from the injector pump return or filter output to injector pump to see if there are any air bubbles.

joejtss - No stoppages for about 3 months after the relay replaced - only started to run rough and die after going up and down fairly steer ramps in a car park then didn't stop again until the other day (just ran like crap for a few days after removing the tank)!

threedogs - done pretty much all the rubber hoses - haven't replaced the metal fuel lines.

roofy - it gets driven almost every day and the fact the fault is so intermittent is the frustrating bit. Have driven it almost every day since the last incident for both short and medium trips with no issue!! Doesn't fill me with any confidence to go hit the tracks with it though. Was going to hit Landcruiser Park on saturday with my son (he also has an 03 Patrol - it just doesn't breakdown as he loves to inform me!!) but the last thing I want is to breakdown halfway up a hill out in the bush so looks like we'll just take his.

I agree with those that think it's a air in the fuel issue and will keep working to try and get it sorted, but there have also been a number of comments and also problems on other forum posts that are similar that wree resolved by replacing the injector pump- bloody expensive maybe though!

Cheers