slow / lack of power on uphill starts

[Gav72]

Gday travellers,

My recent purchase of a GU 2006 Patrol, 4.8L auto has a little quirk.

I've noticed on a number of few occasions, usually when I've come to a stop, and then start to accelerate that the car is lacking power, I'm having to give it a fair amount of revs and even then its only crawling for 5-10 seconds until it starts to properly find 1st gear.

Anyone have any tips on what this is....

I'm thinking with it being an uphill thing it may be to do with fuel getting into the engine etc.....?

[Makka]

Stop doing that and get it to a automatic specialist sounds like it is slipping in first or the fluid is low mine dose that when cold so I drive easy till it warms up the auto in a patrol needs to be service every 20,000 km


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[Gav72]

Stop doing that and get it to a automatic specialist sounds like it is slipping in first or the fluid is low mine dose that when cold so I drive easy till it warms up the auto in a patrol needs to be service every 20,000 km


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Gday Makka,

I reckon perhaps its not dropping back to 1st gear when I come to a stop?, its as if I'm moving off in 3rd or 4th gear, am booking it in.
Has only been happening occassionally, next time it does it I'll slip it into tiptronic - and see if that changes the occurence

[Gav72]

Gday Makka,

I reckon perhaps its not dropping back to 1st gear when I come to a stop?, its as if I'm moving off in 3rd or 4th gear, am booking it in.
Has only been happening occassionally, next time it does it I'll slip it into tiptronic - and see if that changes the occurence

Hi People,

So I've tried moving from drive and dropping the tiptronic at what is coming up in 4th back to 1st, but I get no change in power.
Have checked the air flow sensor and it appears ok.
Have disconnected / reconnected the battery....

Problem still occurs, any ideas,
Can anyone else confirm if there at low speed and move over to tiptronic that it comes up in 4th?
any recommendations for a patrol specialist in Melbourne's eastern suburbs...

Cheers

[Mike02Ti]

Any time you move the tiptronic lever over to manual mode it displays 4th. It doesnt mean though that it is actually in 4th from what I have felt in mine. However selecting 1st while your moving , like changing down as if was a normal manual should be able to be done.

I would be doing a flush on the box. See if that clears it up then go from there.
Other possible things wrong could be the torque converter being stuffed or slipping ratios internally. Will need an auto specialist to take a look and diagnose. Cant help with that sorry as im in WA

[Gav72]

Hiya,
So my service mechanic hooked up his little computer and found the following errors: DTC list - P1764: Direct Clutch Solenoid Valve / Circuit Fault. & P1845: Pressure switch 5 Circuit Valve Difference.....
He said its a bit hard to tell exactly, perhaps new oil/fluids??
I am taking it to a Transmission specialist next week.

Google machine has a few answers, anyone have a glaringly obvious answer to the above faults........

[Avo]

hye mate duuno if they are the same...but i have a 2010 3ltr crd auto,and unless i come to a complete stop...the transmission will not go back to 1st,come up to a give way sign...no cars...take off but not stop...it is pittyfull....did ask someone about it and their answer was that they do not go back to 1st gear unless come to complete stop...

[Gav72]

Hiya

So my Patrol has been in surgery. The transmissions guys have opened up and checked the solenoid valves and found no faults, diagnostics found no fault with the ecu either. They have cleaned the connectors/terminals? where there has been dust / carbon? dust or whatever and are hopeful that my issue may be fixed.

I'm off to pick up the Patrol from the mechanics tomorrow, expecting for what they have checked / tested will run into ...$4-500 or more??,

anyone have a feel for what I should be expecting to pay.....

Cheers

[Gav72]

OK
I have picked up the patrol today
The error codes for the transmission were P1764 & P1845

Mechanics did - scan test and check for code.
Perform solenoid actuations - No faults found.
Remove connectors & valvebody. Remove solenoids from heatplate. Heat up and check resistances. - ALL GOOD.
Clean all solenoid terminals and clean wiring connector.
Reassamble
No faults found / no solenoid failures

The Patrol has had the same issues - since I've driven it on the road today. ie: move off from a stop and car is slowww - like in 4th gear.
I turned off the engine and re started car - moved off and all good at normal speed (as suggested by mechanic).

Mechanic has suggested the next steps in fault finding this issue for permanent fix:
- 1. Check external wiring / harness - 1/2 days work......

- 2. work backwards from the transmission controller through the wiring and hopefully find fault.....

- 3. worst case scenario - Nissans suggestion - replace all wiring = $3-4k - which I hope it doesnt come to that....

Any suggestions gear heads....

[Bloggsy]

Your snow mode switch is not on is it?

[Gav72]

Your snow mode switch is not on is it?

Nope unfortunately

- With regards to shortcut fix on this beig. If the car is sluggish/no power.
I turn off the engine, and then back on again and the car takes off fine.
To me that sounds ECU related - but the transmissions specialist siad their checks had the ECU all ok.
So could it still be anyone of a number of thins electrical wiring etc and not necessarily the ECU....?

[threedogs]

Just to try a different tack, how about a dirty MAF sensor??
Disconnect the battery and give it a clean, allow at least 1/2hr

[Gav72]

funny you say that,

I cleaned it with MAF cleaner about an hr b4 you posted

Havent got it out for a drive yet

[mudnut]

Since you have not had the vehicle long, remove the earth straps and cables and clean the connections. Add a couple of earths between the chassis and body as well. You never know, it may clear the fault, if you are lucky.

[Gav72]

Since you have not had the vehicle long, remove the earth straps and cables and clean the connections. Add a couple of earths between the chassis and body as well. You never know, it may clear the fault, if you are lucky.

being not that mechanically minded, would the earth straps / cables be listed in the owners manual, are they hard to locate etc, I've tried google and theres a little bit there that may steer me in the right direction...

[Gav72]

So I have since used MAF cleaner.
Swapped the relays around.

And I still get this fault / sluggish at take off.
Also had the AT light flash 8 times at me - signalling transmission fault still !!

[mudnut]

I hope someone that owns a 4.8 can tell you. There should be a couple that run from the engine block to the body. As for the body to chassis, I have no idea where they would be. Apparently, some auto shops have cables ready to go and they come in different lengths. Just make sure you get a good metal to metal contact when you fit them.
I also fitted an earth strap from the trailer socket to the chassis.

[Gav72]

So i had a nissan service dealer give it a look over, they couldn't isolate the problem.
They've said they'd have to fault test through all the wiring until its found and that its an unknown. It could take a number of hrs, it could take days.... :(

What do i do...

I'm thinking of looking towards a nissan or 4wd specialist....

Any recommendations for nissan patrol specialists in Melbournes eastern suburbs....

[threedogs]

being not that mechanically minded, would the earth straps / cables be listed in the owners manual, are they hard to locate etc, I've tried google and theres a little bit there that may steer me in the right direction...

As MN suggested first measure where you want the earth strap say Auto casing to
chassis/body or even back to the neg terminal on the battery if its not too long

What area are you in???

[Stropp]

So i had a nissan service dealer give it a look over, they couldn't isolate the problem.
They've said they'd have to fault test through all the wiring until its found and that its an unknown. It could take a number of hrs, it could take days.... :(

What do i do...

I'm thinking of looking towards a nissan or 4wd specialist....

Any recommendations for nissan patrol specialists in Melbournes eastern suburbs....

i would take it to a competent auto sparky rather than a nissan dealer if you are chasing electrical gremlins

[Gav72]

As MN suggested first measure where you want the earth strap say Auto casing to
chassis/body or even back to the neg terminal on the battery if its not too long

What area are you in???

I'm in Ringwood mate

[threedogs]

I'm in Ringwood mate

Go have a talk to Paul at Outback 4wd in Bayswater he may be able to sort you out

[Gav72]

Hello Again,

Having spoken with a few mechanics & auto transmissions places about my issue, it sounds like I'm better off taking my patrol to an auto electrician.

Any experiences / recommendations ..... (Melbournes eastern suburbs)

[Neil V]

Hi Gav72, I have the same problem with my 4.8 and I was wondering if you ever found out what the problem was.
I have spent thousands chasing it and it's killing me.

[Avo]

Hi Gav72, I have the same problem with my 4.8 and I was wondering if you ever found out what the problem was.
I have spent thousands chasing it and it's killing me.

welcome to the forum mate..will tag Gav n see if he gets back to your question

Gav72