D22 yd25 hunting

Scott Doyle · Sep 12, 2024

Hi everyone
I'm having problems with my2011 navara D22 yd25 Japan build 161000klm I first noticed slight hunting on start up. And when you take off a lot of top end rattles under load. Until you reach running temp & then runs normal no rattle hunting not noticeable.
She has had clutch and double row upgraded timing chain at 130000klm. So I read on your site it could be scv so I had it replaced driving home I was giving her a bit hit second and acceleration died had to pull over pressed accelerator flat then it really slowly reeved up. So I turned off turned back on and it drove home. In the morning it wouldn't start. Finally got started straight back to mechanic he has had it for week and a half with no word. Has anyone else had a similar experience.
Regards Scott

MANNING · Sep 12, 2024

Don't quote me, I've read that your SCV can be put in upside down.? 180 turn may fix it? Or a fuel pump reset

Scott Doyle · Sep 13, 2024

MANNING said:
Don't quote me, I've read that your SCV can be put in upside down.? 180 turn may fix it? Or a fuel pump reset

Hi Manning
Thanks for your help I will give it a try.
Regards Scott

MANNING · Sep 13, 2024

Scott Doyle said:
Hi Manning
Thanks for your help I will give it a try.
Regards Scott

Just spitballing, 100% not mechanical advise.

When was the last oil change?
Was the same oil viscosity used?
Just thinking why it's better when it's warmer.

May or may not help with the rattle but some decent in fuel injector cleaner aswell.

Scott Doyle · Sep 13, 2024

MANNING said:
Just spitballing, 100% not mechanical advise.

When was the last oil change?
Was the same oil viscosity used?
Just thinking why it's better when it's warmer.

May or may not help with the rattle but some decent in fuel injector cleaner aswell.

Hi thanks for all your support and advice.i noticed slight hunting about 157...klm so I did a full service all filters water separator. Always use magnatec diesel 15-40 since 30...klm. Nothing changed still rattle when cold and hunting. So I put injector cleaner & Molly oil additive. Little better but still hunting rattles less. Clear hosed fuel pump to check for air nothing. Mechanic couldn't notice it. Checked forum found scv could be fault also noticed oil tube leaking so got mech to replace them both. Then it played up driving home so went straight back. He has had it for two weeks. Told me he had part coming.
Hopefully it's not a $3500 part.
Regards Scott

KevinE · Sep 14, 2024

Dirty or damaged injectors can cause a rattle on cold start up, especially under load, that may go away when the engine heats up. Dirty injectors can cause hunting as well. You say the issue improved a little after you used injector cleaner, which also points towards dirty injectors.

Billy54 · Sep 15, 2024

I use Fuel Doctor additive in every tank, got rid of the hunting. cleans everything from tank to tailpipe with better milage on a long trip.

Scott Doyle · Sep 15, 2024

KevinE said:
Dirty or damaged injectors can cause a rattle on cold start up, especially under load, that may go away when the engine heats up. Dirty injectors can cause hunting as well. You say the issue improved a little after you used injector cleaner, which also points towards dirty injectors.

Hi Kevin
Thanks for your help I will check them out.
Regards Scott

Scott Doyle · Sep 15, 2024

Billy54 said:
I use Fuel Doctor additive in every tank, got rid of the hunting. cleans everything from tank to tailpipe with better milage on a long trip.

Hi Billy
I use to do the same. Probably need to keep it up slacked off penny pinching last year.
Regards Scott

Scott Doyle · Sep 26, 2024

Scott Doyle said:
Hi Kevin
Thanks for your help I will check them out.
Regards Scott

Hi Kevin
Went back to mechanic he is trying to tell me it's the pump $3500 +labor. I got the shits with him guessing went to injector and pump specialist. Straight away said it's not pump it's sucking air. Found brand new ryco fuel filter was faulty and leaking and then found hose on top of tank perished. He gave it back driving home acceleration would just die no rev's. Pull over restart drive off two hundred meters it would just keep loosing any acceleration but continues to idle. Specialist reckons object floating in tank blocking fuel. Just waiting to hear if he has cleaned.
Regards Scott

bringthenav · Sep 26, 2024

MANNING said:
Don't quote me, I've read that your SCV can be put in upside down.? 180 turn may fix it? Or a fuel pump reset

To save him some time taking it out being how much of a hassle it is, i have heard about what your saying & i did mine myself & knew to put in the Correct way up.

The Pink loom part when fitted if i remember right from month ago should be on a certain side, i think the left (looking in at it), if its upside down u can tell by the loom being in wrong spot, (rhs after fitting is wrong way up)

That could be checked by looking at some photos or others pics/vids of the YD25 SCV fitted on youtube or Internet search... or if people post pics here.

I took pics of mine fitted after, i will try attach to this reply. i also changed the Fuel rail pressure sensor @ same time & did the fuel pump/eu reset. Goes much better.

See mypics of the SCV fitted correct way up for reference

bringthenav · Sep 27, 2024

I'd be checking Boost control solenoid ... come to think of it !

My original one i had after i bought the vehicle second hand went on me after a year.

Those symptoms u describe...

The total power dying then idling ok, hunting, i had that trouble, new solenoid i fitted solved it & went like a new car..
For 3 months.. more fool me for buying cheap ones online to experiment with just to check it was the problem, then being a cheap part it would fail. I recommend a Genuine Denso etc thru the actual company, lotta fakes online.

So i replaced my BCS everytime it went & the truck goes 100 times better, its quick as & no hunting, no dying yet idling okay.

bringthenav · Sep 27, 2024

Im having about a 40% power loss trouble now with EGR, even after test blocking, it went okay for a couple weeks or so testing.
I am going to do a full replacement of EGR Sensor/Butterfly & All the Piping.

Estimate cost of $500 before fitting, but my mech is a legend and will probably whack em on in 30 min and charge me $60 bux

Scott Doyle · Sep 27, 2024

bringthenav said:
To save him some time taking it out being how much of a hassle it is, i have heard about what your saying & i did mine myself & knew to put in the Correct way up.

The Pink loom part when fitted if i remember right from month ago should be on a certain side, i think the left (looking in at it), if its upside down u can tell by the loom being in wrong spot, (rhs after fitting is wrong way up)

That could be checked by looking at some photos or others pics/vids of the YD25 SCV fitted on youtube or Internet search... or if people post pics here.

I took pics of mine fitted after, i will try attach to this reply. i also changed the Fuel rail pressure sensor @ same time & did the fuel pump/eu reset. Goes much better.

See mypics of the SCV fitted correct way up for reference

Hi bringthenav
The first mechanic installed the new one upside down then they flipped it. But all problems continued. They wanted to do diesel pump $3500+labor so I got the shits as it wouldn't start next day. Found a injector and pump specialist. He found faulty new ryco fuel filter and perished hose on tank sucking air so he replaced and installed Old SCV. On the way home started doing all the same symptoms driving along you just loose all acceleration it drops to idle. Turn off restart acceleration is back drive of and it does it again. Straight back limped back restarting every couple of klms. Specialist reckons object floating around in the tank he is dropping tank to find and fix.
Praying that's it.
Thanks Scott

Scott Doyle · Sep 27, 2024

bringthenav said:
I'd be checking Boost control solenoid ... come to think of it !

My original one i had after i bought the vehicle second hand went on me after a year.

Those symptoms u describe...
The total power dying then idling ok, hunting, i had that trouble, new solenoid i fitted solved it & went like a new car..
For 3 months.. more fool me for buying cheap ones online to experiment with just to check it was the problem, then being a cheap part it would fail. I recommend a Genuine Denso etc thru the actual company, lotta fakes online.

So i replaced my BCS everytime it went & the truck goes 100 times better, its quick as & no hunting, no dying yet idling okay.

Hi we're is BCS located I'm guessing on or near turbo.
Regards Scott

SJM683 · Sep 27, 2024

Don’t stress too much about the cold injector rattle, common rail life. I had mine replaced as they were “just out of spec” and the new ones sound the same.
Have you tried another mass air flow sensor? Could be worth a try.
Also, check the turbo impeller housing bolts, mine came loose and I lost a lot of power. Was a common fault and I replaced several turbos under warranty on customers cars back in the day.

Scott Doyle · Sep 28, 2024

Hi guys after two mechanics and injector and pump specialist has come back after telling me it wasn't the pump & saying he thought something was floating in tank. It turns out valve in fuel pump is stuffed so I need to replace the fuel pump after a month of being left with mechanics replacing parts willy nilly $1500 wasted now I have to wait two weeks for him to replace the pump.
Regards Scott

Mark1973 · Sep 29, 2024

Scott Doyle said:
Hi guys after two mechanics and injector and pump specialist has come back after telling me it wasn't the pump & saying he thought something was floating in tank. It turns out valve in fuel pump is stuffed so I need to replace the fuel pump after a month of being left with mechanics replacing parts willy nilly $1500 wasted now I have to wait two weeks for him to replace the pump.
Regards Scott

Did anyone do a diagnostic scan on the vehicle before embarking on that all too familiar "try this/try that" practice at the customer's expense?

Scott Doyle · Sep 29, 2024

Mark1973 said:
Did anyone do a diagnostic scan on the vehicle before embarking on that all too familiar "try this/try that" practice at the customer's expense?

Hi Mark I only sore the specialist using it constantly apparently it was telling him scv. Then finally thinks Valve in pump isn't working properly.
Regards Scott

Scott Doyle · Oct 20, 2024

Update on D22 STR yd25 hunting.
After two mechanics and two pump and injector specialist. Two months on and no truck first specialist found perished hose on top of tank new ryco filter Faulty and having extra ryco water separator made negative suction to system. He gave it back on the way home it stalled 28 time's.then he thought it had something floating in tank. Computer kept telling scv but it wasn't as he changed again and again. Believed it was plunger in the pump. He didn't fit pumps. So a second specialist quoted $1900 fitted. I booked it in for pump replacement two and a half weeks later no word. Chased him every two days he kept telling me I don't think it's your pump. And if it turned out to be the pump he would only charge me for the pump fit as quoted $1900. Two and half weeks not one call from him. I ring he says I just got back from drive come pickup. Get there he lays down bill for $2585. And I have to come back and get a part that he took back of my truck to fix someone else's truck. I only had two grand stressed and pissed off as fuck just left apparently owing $585 . I get home open bonnet find factory return lines with no hoses completely open metal pipes. That's not right Don't use Geoff at Reef diesel in Mackay. Ripped me off and doesn't keep his word.

D22 yd25 hunting

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