Sudden power loss on motorway

[Yorkshire4x4]

SCV valves are always number one suspect on these engines - can an electronically controlled enclosed solenoid driven valve fail catastrophically - i think so

Thank you Shane
I thought the suction control valves would die a slow death going into limp mode etc. Looks like they suddenly packed in. Fingers crossed its nothing else or I will be stuck in mud

 

[StarCruiser]

Did you try running from a can or does your mechanic think he’s eliminated the need to do this? Have you checked for wiring damage Round the oil filter if any? I’m not sure if it has one but a crank position sensor would cause sudden stop if the connection to it failed. Equally if connection to an SCV failed it would almost certainly die. You haven’t got any codes or CEL so I’m thinking it’s not anything that’s monitored like a sensor or valve coil. That said, SCVs are the only things to generally fail on these engines of their own accord.

 

[Yorkshire4x4]

Did you try running from a can or does your mechanic think he’s eliminated the need to do this? Have you checked for wiring damage Round the oil filter if any? I’m not sure if it has one but a crank position sensor would cause sudden stop if the connection to it failed. Equally if connection to an SCV failed it would almost certainly die. You haven’t got any codes or CEL so I’m thinking it’s not anything that’s monitored like a sensor or valve coil. That said, SCVs are the only things to generally fail on these engines of their own accord.

The mechanic said there was no need to run it direct from a diesel can as he Che ked all the pipes and the fuel primer. He did not mention any wiring near the oil filter its a d4d so maybe there's none.
It just judders like mad when u turn the key so he said he could only think of it being suction control valves. Due to the rev meter going up during the judder he has eliminated ecu failure

 

[StarCruiser]

Sounds like he’s got it under control.
Hopefully the SCVs cure it.
Looking forward to hearing that it’s going. SCVs are available from Roughtrax I believe.

 

[Yorkshire4x4]

Sounds like he’s got it under control.
Hopefully the SCVs cure it.
Looking forward to hearing that it’s going. SCVs are available from Roughtrax I believe.

Thank you StarCruiser
The crank position sensor was tested claims the mechanic as the rev meter was working during the judder when key was turned ! I will deffo report back to the forum once the suction control valves are in

 

[StarCruiser]

It’s probably them. Just an unusual way for them to die. Doesn’t mean they haven’t. Just part of the learnin’.

 

[Animal Mother]

Have you had the diesel pump injector timing checked? Might have slipped on the belt.

 

[Yorkshire4x4]

Have you had the diesel pump injector timing checked? Might have slipped on the belt.

Hi Animal. Other No where will I find the diesel injector timing and what are the symptoms if one slips
Thank you for your contribution

 

[Yorkshire4x4]

Having just replaced the suction control valves I made two attempts to start it it did not start. The battery went dead so ive left the batteries to charge over night and will try again tomorrow!

 

[Higgy]

Having just replaced the suction control valves I made two attempts to start it it did not start. The battery went dead so ive left the batteries to charge over night and will try again tomorrow!

Sorry to jump in, but I had same problem with 3.1 trooper. I ran it from a can direct into the fuel filter fired up straight away, turned out to be split pipe from tank.. sorry I was just reiterating starcruisers post... worth a try

 

[StarCruiser]

Sorry to hear that Yorks I had my fingers crossed for you.
At least you can eliminate the SCVs now.

 

[Yorkshire4x4]

Sorry to jump in, but I had same problem with 3.1 trooper. I ran it from a can direct into the fuel filter fired up straight away, turned out to be split pipe from tank.. sorry I was just reiterating starcruisers post... worth a try

Thank you Higgy
There is no sign of diesel leaking and the mechanic seems to think diesel is circulating so no need to run it from a can of diesel !! I'm stuck the mechanic did mention injectors but I've never had white or black smoke no rattles it's a KDJ95 52 reg d4d so not suspecting injectors! ! I need a landcruiser specialist to get me out of this mess
Thank you for your contribution

 

[StarCruiser]

Sorry Yorks, but I’m not 100% on what you’re being told by your mechanic. Theory is one thing and I respect his experience but nothing beats actually doing the simple test and then saying ‘see I told you it wouldn’t run off a can’ but if you don't and it does turn out to be then you’ll kick yourself for not doing it.

It cannot be injectors. Sorry, what, all of them, all at the same time? Sorry I don’t buy that one.

 

[Higgy]

My signs a symptoms were the same, It just died at 70 on the m25. no smoke pops or bangs, it just died..

 

[Yorkshire4x4]

My signs a symptoms were the same, It just died at 70 on the m25. no smoke pops or bangs, it just died..

Thanks star and Higgy I will put some preassure on my mechanic tomorrow to run it through a can it has to be fuel pipes as Higgy says as I've had issues with fuel pipes at the top of the tank before

 

[Jack VZJ90]

I don't drive a diesel, but former diesel cars i drove had a diesel fuel cut-off valve to stop the engine. Normally while running it has a 12 volt current on it to stay open. With ignition switch off current stops and valve closes. To test this, you can make an electrical bypass. But again, i don't know if those diesel engine's have one these days. good luck.

 

[Higgy]

Thanks star and Higgy I will put some preassure on my mechanic tomorrow to run it through a can it has to be fuel pipes as Higgy says as I've had issues with fuel pipes at the top of the tank before

Its quick and simple to do.. if it doesn't work.. Star and I will get our coats , Promise

 

[Beau]

Does the check engine light appear when you turn the ignition on? Does your truck have an alarm/immobilizer fitted? Check the ground wires for the immobilizer in the drivers side wing area, this can cause similar issues.

Not sure on the D4D lump but on the KZ you can crack the injector line after the pump to see if the pump itself is passing fuel on. This will show the pump is working. But I know the injectors on the D4D are controlled via the ECU so that may not help.

 

[Yorkshire4x4]

Does the check engine light appear when you turn the ignition on? Does your truck have an alarm/immobilizer fitted? Check the ground wires for the immobilizer in the drivers side wing area, this can cause similar issues.

If only you guys were northerners you could have grabbed your coats and boots n spanners and sorted it

Not sure on the D4D lump but on the KZ you can crack the injector line after the pump to see if the pump itself is passing fuel on. This will show the pump is working. But I know the injectors on the D4D are controlled via the ECU so that may not help.

The mechanic pumps the fuel pri

Does the check engine light appear when you turn the ignition on? Does your truck have an alarm/immobilizer fitted? Check the ground wires for the immobilizer in the drivers side wing area, this can cause similar issues.

Not sure on the D4D lump but on the KZ you can crack the injector line after the pump to see if the pump itself is passing fuel on. This will show the pump is working. But I know the injectors on the D4D are controlled via the ECU so that may not help.

 

[StarCruiser]

I don't drive a diesel, but former diesel cars i drove had a diesel fuel cut-off valve to stop the engine. Normally while running it has a 12 volt current on it to stay open. With ignition switch off current stops and valve closes. To test this, you can make an electrical bypass. But again, i don't know if those diesel engine's have one these days. good luck.

Good call Jack but I think this function is performed by the suction control valves.