Unexplained loss of power 4.7lt V8 petrol (1 Viewer)

[Spudman]

Hi everyone

I am having this intermittent problem with my landcruiser and it's scaring the geebies out of me

When I first bought the cruiser about 12 months ago, I was diving along the highway at around 120km/h it was around 38 degrees Celsius outside! all of a sudden whenever I put my foot down the vehicle would accelerate to around 5500 rpm but would not increase speed.

I reported it to Toyota and they said there are no error codes showing and they would need to see the car when it's actually happening.

In the last 12 months it happened once again, driving normally accelerating normally and then when planted the foot upto 5500rpm and car is not going faster.

Just recently it has started happening quite often including whilst passing a truck, I accelerated and nothing 5500rpm and wouldn't pick up speed.

A mechanic thought it might be the fuel cap not breathing correctly, so when it happened today I pulled over and opened the cap, a heap of pressure released, I then tightened it and accelerated heavily, it coughed and sputtered a bit and again wouldn't increase speed, so I pulled over undid the cap and left it slightly open and tried again and same thing.

So I stopped for 10 minutes, turn it off and opened the fuel cap, I then took off and all back to normal.

So my mechanic friend has told me to get a fuel filter and a fuel cap from the Toyota dealer here in Kununurra and we'll try that.

So has anyone got any ideas, ever had the same problem, it's not limp mode because it accelerates normally and changes gears it's only when you accelerate heavily.

Thanks

Spudman

 

[OGBeno]

Hi everyone

I am having this intermittent problem with my landcruiser and it's scaring the geebies out of me

When I first bought the cruiser about 12 months ago, I was diving along the highway at around 120km/h it was around 38 degrees Celsius outside! all of a sudden whenever I put my foot down the vehicle would accelerate to around 5500 rpm but would not increase speed.

I reported it to Toyota and they said there are no error codes showing and they would need to see the car when it's actually happening.

In the last 12 months it happened once again, driving normally accelerating normally and then when planted the foot upto 5500rpm and car is not going faster.

Just recently it has started happening quite often including whilst passing a truck, I accelerated and nothing 5500rpm and wouldn't pick up speed.

A mechanic thought it might be the fuel cap not breathing correctly, so when it happened today I pulled over and opened the cap, a heap of pressure released, I then tightened it and accelerated heavily, it coughed and sputtered a bit and again wouldn't increase speed, so I pulled over undid the cap and left it slightly open and tried again and same thing.

So I stopped for 10 minutes, turn it off and opened the fuel cap, I then took off and all back to normal.

So my mechanic friend has told me to get a fuel filter and a fuel cap from the Toyota dealer here in Kununurra and we'll try that.

So has anyone got any ideas, ever had the same problem, it's not limp mode because it accelerates normally and changes gears it's only when you accelerate heavily.

Thanks

Spudman

You might have better luck getting a good answer in the 100 series section since the US market did not get the 200 series with the 4.7L.

The US market only got the 5.7L petrol engine for the 200 series.

 

[Spudman]

Thanks Beno, I was going to do that, but I've got it licked now

Drove back today, about 120k from home on a 357k trip and it started playing up big time, so I just took it easy till I got back to Halls Creek, put it on the OBD machine and it finally came up with error codes P0171 and P0174 which relates to system too lean, bank 1 and bank 2, so it's either oxygen sensors, fuel pump or fuel filter at least we've nailed it

On a sad not Scanguage did not pick up the codes, useless piece of crap
And also the engine management light did not come on

 

[LCKID]

Thanks Beno, I was going to do that, but I've got it licked now

Drove back today, about 120k from home on a 357k trip and it started playing up big time, so I just took it easy till I got back to Halls Creek, put it on the OBD machine and it finally came up with error codes P0171 and P0174 which relates to system too lean, bank 1 and bank 2, so it's either oxygen sensors, fuel pump or fuel filter at least we've nailed it

On a sad not Scanguage did not pick up the codes, useless piece of ****
And also the engine management light did not come on

you have the exact opposite problem that i do; i get the "too rich" error code at least once a day now. become ridiculous. i wonder if there could be an issue with my fuel pump or filter??? this has been going on since 1000miles (now 3800miles)

 

[Spudman]

Have you taken yours to a Toyota dealer, because your lucky in that you've got codes, according to 2 Toyota Dealers there were no codes on mine, yet an independent mechanic plugs his code reader into the UBD and gets to codes straight away that are causing the problems

 

[LCKID]

Have you taken yours to a Toyota dealer, because your lucky in that you've got codes, according to 2 Toyota Dealers there were no codes on mine, yet an independent mechanic plugs his code reader into the UBD and gets to codes straight away that are causing the problems

Multiple times and on Monday the UNICHIP will be replaced, however UNICHIP claims (i DO believe them) that they have never once seen/heard of such issue

 

[Spudman]

Ok best of luck with yours and hopefully mine will be sorted very shortly

 

[Spudman]

So gotta a call from the Toyota dealer this morning, very apologetic and assured me that they wanted this fixed nearly as much as I do they also assured me that the person at the service centre has been sacked already for other problems with customers

They have told the mechanic here that it will be a process of elimination and they will support and pay him for his work.

So at the mechanics today they agreed first place to start was the fuel filter, now where is it. According Toyota it's in the fuel tank not even close it's just in front of the KDSS adjusters, but anyway we pulled the filter out and tested it and it's all good and working perfectly.

Process of elimination, 1 down how many more to go

Next onto the sensors

 

[Spudman]

Today we plugged in one of those u bute OBD scanners, worth about $9000, did all the tests and everything came up passed, no error codes, zip.

Took it for a test drive around 100 kilometres, did everything I did the other day and the car drove and responded perfectly.

The last 50 kilometres I put the cruise control on and yet again it drove and responded perfectly, no dropping gears to get up hills etc just drove completely normal.

So tomorrow it's a 200 kilometre trip to see if we can get it to break down

 

[Spudman]

Today was the big trip, drove a 100km's out and back tried everything to get it to play up, nothing drove beautifully and did everything I asked of it.

Ain't it a shame when you have to resort to driving your car hoping it will play up.

Anyway we are now looking at the fuel vaporising due to the hot weather, so if it turns out to be that, looks like I'm just gonna have to live with it

 

[FJ62INTX]

Hmm...

Not knowing the 200 emissions system with a 4.7, would there be a solenoid that controls vapor release to the carbon canister that could be essentially air-locking your fuel tank and causing an extreme vaccum to form?


The only other thing that I could recommend is to drain the fuel tank and fill with new high octane gas.

It is possible that You got a bad tank of old gas that has lost much of its octane and light ends....


Being that the symptoms didn't show on your recent trip, bad gas may make the most sense.

BTW- 38 degrees Celsius is only 100 degrees Fahrenheit.... We see that here in Texas for much of the summer normally.... It doesn't cause vapor lock in anything but old carbureted cars really...

 

[Spudman]

Thanks for the info mate, I'll take it to my mechanic and show him your response.

Also my mechanic has suggested that I ask on here if anyone is having problems with 5.7 litre as apparently they are the same setup with fuel system and also the Lexus 5.7.

So looking forward to any responses

Btw we are going to pull the fuel tank out on Tuesday there is supposed to be a liner on the bottom of the tank, similar to a big filter, so we're going to have a look inside the tank.

Incidentally since cleaning the fuel filter my fuel economy has dropped by 4-5 litres per hundred kilometres

Thanks

Spudman

 

[AussieHJCruza]

Incidentally since cleaning the fuel filter my fuel economy has dropped by 4-5 litres per hundred kilometres

 

[Spudman]

Thanks mate, hopefully that wall will disappear

 

[AussieHJCruza]

Yeah, I know how you feel with an intermittent problem...The only time it WON'T do it is when the service tech from Toyota is driving the car!
We had some stupid intermittent issue a couple of years ago with Mum's Toyota (not as serious, just annoying) but they sorted it out in the end

 

[Spudman]

Today was a good day

Pulled the tank out today at my mechanics workshop, comes out quite easily.

We then removed the fuel pump and it was clogged with rubbish also around the filter area as well, so we gave it a good clean, all back together and she runs so beautifully it amazing.

The only thing you need to remember when removing the tank is where the coloured fuel lines go back all worked out ok in the end.

We also replaced the fuel filter with a genuine Toyota one, you can buy aftermarket filters on eBay for $20, genuine cost me $80

So my mechanic is going to write up his report to Toyota tomorrow with the recommendation that they replace the fuel pump, so we'll wait and see.

 

[LCKID]

well, installed the new UNICHIP module at 3838miles, and at 3858miles sure enough she threw the same "Top Rich 1 and 2" codes.....

Any insight welcome; i am thinking the bad fuel at 1000miles has caused something to go wrong with fuel sending unit and/or fuel filter

 

[Spudman]

Well I went to see the mechanic yesterday as he said he was going to ring Toyota to let them know what he has found and whether or not they will replace the filter.

It's amazing how a Service Manager can change the way he's thinking, no scrap that he typical leopard what they're thinking and what they're saying are 2 different things, anyway big argument on the phone and now I've got to wait until he views the photos of the fuel pump.

Well here's the photos of the fuel pump that I sent him

Now you probably wouldn't get a fuel pump replaced under warranty like this, but this has been the problem since I purchased the vehicle 12 months ago causing excessive fuel consumption and running rough.

He gave it a good clean but he couldn't get a new pump before I drove to Perth.

I'm heading to Perth tomorrow it is around 3000 kilometre trip so hopefully now the car will run nice and smooth.

Hey Lckid is that a unichip you have fitted to a petrol, I've been told you can't get one.

 

[LCKID]

Hey Lckid is that a unichip you have fitted to a petrol, I've been told you can't get one.

yes, it's a UNICHIP that is programmed to work in conjunction with my TRD SC. this entire situation is utterly bizarre for a truck with just under 4000miles on it.

 

[Spudman]

Lckid
Did you try driving it around without the chip, drive it for about 50k and see if it does it again, at least that way you can eliminate the chip, also show Toyota dealer my photos although I'd be surprised if your pump would be as dirty as mine.

With so few k.s on the clock Toyota should be doing a whole lot more