Pajero Owners Club of South Africa

So my Paj has had the heart transplant after the original engine developed a hole in a piston. Read my previous post here: https://www.pajeroclub.co.za/forum/view ... =24&t=6213

The "new" engine idles fine, but when driving the car there is no power. After scanning for errors it gave error 41. That's the throttle control valve. However, the mechanic has swopped the throttle control valve with one from a working Paj and there is no improvement. The mechanic has also double checked the vacuum tubes and electrical wires of the engine without any success, and he is about to give up hope.

My Paj has been standing for 3 months now and I really need her back in a good running condition. Any ideas where one could still look for the fault that causes the lack of power?? Any ideas would be welcome!!

Thanks in advance.

Hi superairborne. Does it throw a Cel under acceleration?

The throttle control valve kills the engine quickly under shutdown by closing completely, and under closes partially under part throttle conditions to assist the EGR in operation.

You can safely disconnect both vacuum hoses by blocking then with a bolt or golf tee and take it for a test drive as the valve will stay 100% open. It will throw a CEL, but see if your power problem is solved, if not the problem lies elsewhere unfortunately.

Google for 4epikanini's post with a you-tube clip of how it the valve should work when operating properly.

If this all checks out, looks at typical issues like air, fuel filters, kinked hoses, injector pump timing, vacuum leak in fuel line, etc....
Good luck

Ps. Did they do a complete engine swap, ie injector pump and everything, or did they swap these items back to the 'newer' engine from the old?

Pps. Have you checked if the turbo is boosting correctly, @ 1.6bar? Might be a loose or cracked hose or intercooler or maybe a stuck wastegate actuator?

Sent from somewhere in a galaxy far, far away...

Nick Gibson wrote:Hi superairborne. Does it throw a Cel under acceleration?

The throttle control valve kills the engine quickly under shutdown by closing completely, and under closes partially under part throttle conditions to assist the EGR in operation.

You can safely disconnect both vacuum hoses by blocking then with a bolt or golf tee and take it for a test drive as the valve will stay 100% open. It will throw a CEL, but see if your power problem is solved, if not the problem lies elsewhere unfortunately.

Google for 4epikanini's post with a you-tube clip of how it the valve should work when operating properly.

If this all checks out, looks at typical issues like air, fuel filters, kinked hoses, injector pump timing, vacuum leak in fuel line, etc....
Good luck

Ps. Did they do a complete engine swap, ie injector pump and everything, or did they swap these items back to the 'newer' engine from the old?

Pps. Have you checked if the turbo is boosting correctly, @ 1.6bar? Might be a loose or cracked hose or intercooler or maybe a stuck wastegate actuator?

Sent from somewhere in a galaxy far, far away...

We know that it's not the throttle control valve as there has been three different valves in the car and the problem persists. Turbo boost is at 1.6bar. Fuel and air filters are new.

The "new" engine has the injector pump of the "old" engine. The injectors have undergone a spray pattern test and tested fine.

It might not be the valve itself, it might be a sticky solenoid causing the throttle valve to not open or close correctly? If the EGR activated solenoid get stuck open, the throttle valve will be closed by 90% the whole time.

Do 4ePikanini's test as posted on you-tube and report back.
See here:
https://www.pajeroclub.co.za/forum/viewtopic.php?t=4274

Other issues to check:
1. Accelerator check - the car has drive by wire and there might be a fault there that the ECU isn't receiving full throttle signal from the potentiometer under the accelerator pedal.
2. Injector pump timing out by a tooth.
3. Blocked fuel pickup in the diesel tank.
4. Fuel tank breather blocked?

To build on Nick's response, it seems that fuel supply problems can result in a code 41 being thrown - per this thread: Fault code 41

In particular, this post:
"They're twin break nozzles (injectors).
you will know if they are duff as makes it smokey and rattly.
ive never come across this (code 41) with duff injectors.
ive seen the tcv problems with a blocked filter.
its to far out of position as trying to make up for lack of fuel.
I suppose if metal fillings from pump gone to injectors it could of blocked nozzles.
This would make tcv out of tolerance but when thats the case I dont see 41."

Could be that standing for 3 months you have algae growth in your fuel tank. Try draining some fuel from filter bowl water drain into glass jar for a visual inspection.

If the fault lies with the throttle control valve or any of the other systems that feed the throttle control valve with info would the car smoke when driven??

Mine does not smoke. It's just that the power is so low that max speed is hardly 40km/h.

superairborne wrote:If the fault lies with the throttle control valve or any of the other systems that feed the throttle control valve with info would the car smoke when driven??

Mine does not smoke. It's just that the power is so low that max speed is hardly 40km/h.

Possibly, possibly not... It Depends on how much fuel the ecu is sending to the injectors as determined by the sensors around the engine.

Black smoke is generally over fuelling, ie. Too much diesel fuel for the available oxygen to combust cleanly in the cylinder, unburnt diesel = black smoke. The MAP sensor could pick up low manifold air pressure due to the throttle valve not opening correctly and adjust the fuelling downward accordingly.

For an engine to work properly, it needs air and fuel in the correct proportions. Mess with one or the other and the performance suffers drastically. Start with the easiest things to check and work up from there.

Sent from somewhere in a galaxy far, far away...