2006 Prado stalling and starting issue

[Wettergreen]

Hi,

Last summer my j120 had a period where it suddenly would stall at low rpm and idle and was very difficult to start - if it would start at all. On my way home from an errand out of town it died in a roundabout and I had to get a friend to come tow it while I hopped on a flight home. Anyway, after a week and a switch of battery (unrelated?) in the car key it started fine and had no issues. Until now, a year later, the same issue.

At low rpm it dies and won't restart unless I reconnect the battery. In idle it sits at ca 700rpm and occasionally dips to 650; it might recoup to 700rpm a few times until it eventually dies. As long as I keep rpm high the car drives perfectly.

No error codes present themselves.

What do you all think?

 

[OG Zuninja]

Mileage? When was the last time the ignition was serviced? What about fuel delivery? With no knowledge of your vehicle's service history, we're flying blind.

 

[Wettergreen]

Mileage? When was the last time the ignition was serviced? What about fuel delivery? With no knowledge of your vehicle's service history, we're flying blind.

I bought it >1 year ago 170000km - been driving it a lot. Now sits at 209000km. I've personally had it serviced twice, a major one at 190k and another now at 205k - right before the issue presented itself again. Unsure if ignition is looked at/service during the major one at 190k.

Some googling brought me to the thought of it being the suction control valve - at least the symptoms were similar... Am I just guessing here or could it be?

 

[OG Zuninja]

What exactly was serviced? There's a lot of information still being left out. You very well could be guessing.

Now that you mention "suction control valve", that changes things a bit and gives a small glimpse at what direction we can go for troubleshooting.

 

[Wettergreen]

What exactly was serviced? There's a lot of information still being left out. You very well could be guessing.

Now that you mention "suction control valve", that changes things a bit and gives a small glimpse at what direction we can go for troubleshooting.

To be honest I think not too much. I'm not very satisfied with the Toyota car maintenance service - they do more talking than maintenence. But they follow a maintenance schedule/booklet, and I have the papers - just not on me atm since I'm away at my cabin without my car of course.

The last (smaller) service however,
"maintenence according to booklet (21 years/315000km)
Oil filter
Synthetic oil"

 

[Wettergreen]

To be honest I think not too much. I'm not very satisfied with the Toyota car maintenance service - they do more talking than maintenence. But they follow a maintenance schedule/booklet, and I have the papers - just not on me atm since I'm away at my cabin without my car of course.

The last (smaller) service however,
"maintenence according to booklet (21 years/315000km)
Oil filter
Synthetic oil"

My prado is at a workshop currently but the guy can't find any error codes and is somewhat bewildered. He - probably googling as well - mentioned SCV. was hoping this was a known issue - and that a fix was straight forward. Not very keen on a "changing parts until it solves itself" approach.

 

[OG Zuninja]

Firing the parts cannon at the problem is a method but not an effective one. I assume you have a diesel. We don't have the diesel J120 in the States so its tough for me to help very much.

That said, if you're having stumbling, it seems you could be having fuel delivery issues especially considering the age of the vehicle. What exactly is the problem is the tough part. Does your guy have a way to check the fuel pressure and see if its within tolerance?

 

[FrankTorres]

What engine do you have in your Prado?

 

[Wettergreen]

What engine do you have in your Prado?

3.0 D-4D 1KD-FTV 4x4 (122 kW)

 

[Wettergreen]

Ok, so I have some data from the workshop.

Comments (pardon my translation from norwegian to english):


"*Error codes read. No active error codes found under further control.
*MAF sensor controlled and replaced without change in symptom.
*Motor stalled in idle, but was held alive with higher engine speed(rpm).
*Rail pressure was controlled using live data. Actual rail pressure varied and deviated from desired value under certain circumstances.
*After ended control issue could not be recreated, motor started and worked normally."

 

[Wettergreen]

Ok, so I have some data from the workshop.

Comments (pardon my translation from norwegian to english):


"*Error codes read. No active error codes found under further control.
*MAF sensor controlled and replaced without change in symptom.
*Motor stalled in idle, but was held alive with higher engine speed(rpm).
*Rail pressure was controlled using live data. Actual rail pressure varied and deviated from desired value under certain circumstances.
*After ended control issue could not be recreated, motor started and worked normally."

View attachment 4173736

View attachment 4173737

View attachment 4173738

View attachment 4173739

View attachment 4173740

 

[OG Zuninja]

Well, as suspected, its a fuel delivery/pressure issue. Since I'm not familiar with the diesel variants of the Prado 120 (as previously stated), this is what I found with some internet searching:

and this:

Goes inline with what you found initially but the diagnosis from the tech was needed before giving a recommendation. From the looks of this video, it seems easy enough to repair:

 

[Wettergreen]

Well, as suspected, its a fuel delivery/pressure issue. Since I'm not familiar with the diesel variants of the Prado 120 (as previously stated), this is what I found with some internet searching:
View attachment 4173763
and this:
View attachment 4173764
Goes inline with what you found initially but the diagnosis from the tech was needed before giving a recommendation. From the looks of this video, it seems easy enough to repair:

I did order a new SCV, which arrived today. I'll be a little surprised if it fixes the problem but I welcome it and hope it does!

Thanks a lot for your input.

 

[OG Zuninja]

Hopefully that does it for you. Happy to help however I could.

 

[Wettergreen]

Hopefully that does it for you. Happy to help however I could.

The shop wanted $350 to swap the scv... Managed to get the prado home and swapped it myself. Fingers crossed.

 

[pngjoseph]

Hi,

My KDJ95R-GKMNYW with the 1KDFTV is having starting issues. Consistently will not start on the first key turn but will start on the second key turn. It has had loss of power as well. My particular injection pump has two SCV (one red, one green) which I am ordering replacements for. I am in PNG with no shops available locally so I have to use the "changing parts until it solves itself" approach. There is another part on the top of my injection pump which I am curious about but cannot find any information for. Would anyone know what this part is and what id does?