TD5 rough running.

**sierrafery** · 25th February 2021, 07:30 PM

I should have mentioned F2 engine bay

**Tins** · 25th February 2021, 07:35 PM

Originally Posted by sierrafery

I should have mentioned F2 engine bay

Yep. Sussed that.

**slug_burner** · 25th February 2021, 09:51 PM

My money is on the fuel pump. Although in my experience the engine idled ok, under load the engine had no power and was just as if starved for fuel. Car was able to tick along on the dirt track, as soon as it got on the bitumen the fuel supply was not up to it.

**Tins** · 25th February 2021, 10:24 PM

Originally Posted by slug_burner

My money is on the fuel pump. Although in my experience the engine idled ok, under load the engine had no power and was just as if starved for fuel. Car was able to tick along on the dirt track, as soon as it got on the bitumen the fuel supply was not up to it.

In this case I don't think so. I was prepared to agree, but the only time it has a problem is when I floor it, and then it takes a few seconds. The rest of the time, including driving around here, freeway driving, going up a certain track near here, it's fine. So, under load it's fine, but full throttle it fails. I'll try the boost solenoid first. It's cheaper.

**Bohica** · 26th February 2021, 06:40 AM

No need to buy the whole thing.

Land Rover Discovery Defender TD5 Fuel Pump Kit Genuine VDO Made in Germany 4103590928344 | eBay

**Tins** · 26th February 2021, 09:51 AM

I had the tank out, and the pump out of the tank. Don't ask. The pump housing thing was broken.
IMG_2098.jpg IMG_2099.jpg IMG_2104.jpg

So I did this:

IMG_2124.jpg IMG_2125.jpg IMG_2126.jpg

Seems to work.

**Tins** · 26th February 2021, 11:45 AM

Originally Posted by sierrafery

Remove fuse F2 and try so cos then the solenoid should be open all the time as like it's bypassed

I think that did it! Thanks again.

**Tins** · 26th February 2021, 02:06 PM

Originally Posted by Tins

I think that did it! Thanks again.

Spoke too soon. But it's so random I'd better go over all the wiring for a potential short or something.

**maxperformance** · 26th February 2021, 02:25 PM

Can you explain what exact happened when you "floor it" then "it fails"? Does it surge/jump like short of air or fuel, or does it stop/stall immediately, or it doesn't go more revs than 2700rpm-3000rpm, or it doesn't response in a few seconds then slowly increases the power as normal, or how it "failed"?

Originally Posted by Tins

In this case I don't think so. I was prepared to agree, but the only time it has a problem is when I floor it, and then it takes a few seconds. The rest of the time, including driving around here, freeway driving, going up a certain track near here, it's fine. So, under load it's fine, but full throttle it fails. I'll try the boost solenoid first. It's cheaper.

**Tins** · 26th February 2021, 02:42 PM

Originally Posted by maxperformance

Can you explain what exact happened when you "floor it" then "it fails"? Does it surge/jump like short of air or fuel, or does it stop/stall immediately, or it doesn't go more revs than 2700rpm-3000rpm, or it doesn't response in a few seconds then slowly increases the power as normal, or how it "failed"?

First time it happened I was driving up a hill and accelerated and it lit up the MIL, the fuel filter light and it lost power and surged until I backed off. I was able to drive it to the top of the hill, and then I restarted it.
Next time I was pulling away from the lights and wanted to see how the shifts were going at full throttle. This time it lit up both the lights, lost all power and stalled and refused to cooperate until I shut it down and restarted it. I thought, and an indie confirmed, that it might be the boost solenoid that was the culprit. I disabled that and for some time today I thought that to be correct, but then it did it again, this time NOT at full throttle but going up a hill. I'm beginning to suspect that my wiring job may not be as good as I thought. The CPS wiring was what was damaged.

Originally Posted by sierrafery

The MIL can be "officialy" triggered only by two things on a Td5: the CPS or TPS

I'll also grab the TPS off the other car. I was planning to do so anyway.

Thread: TD5 rough running.

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Fuel pump

If it is the pump.

I did have to 'repair' the pump..

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