200 TDI running issue
Discussion
Hi all,
My mate has series 3 lightweight that has been converted to 200tdi at some point in its life. We have a bit of a running issue with it that I have no idea how to move forward on.
If you leave it to idle for five minutes and press the throttle it won't pick up. It bogs down but as soon as you let the throttle off it idles perfectly. With a bit of feathering it will pick up again but if it was a petrol car it would be best described as what feels like fuel starvation. It also runs out puff at the top end and if revved nearer the upper part of the rev band it starts to lose power and it takes a second or so once in the next gear for it to come back to you. Right that's the symptoms.
We have checked that its boosting properly and holds 12psi well once up and running. I checked the fuel flow yesterday to see if we had an air leak or a dodgy lift pump. The flow out of the return pipe at idle was around 1 Litre/minute which I thought was plenty. After that I'm stumped.
Any ideas would be gratefully received.
Thanks
My mate has series 3 lightweight that has been converted to 200tdi at some point in its life. We have a bit of a running issue with it that I have no idea how to move forward on.
If you leave it to idle for five minutes and press the throttle it won't pick up. It bogs down but as soon as you let the throttle off it idles perfectly. With a bit of feathering it will pick up again but if it was a petrol car it would be best described as what feels like fuel starvation. It also runs out puff at the top end and if revved nearer the upper part of the rev band it starts to lose power and it takes a second or so once in the next gear for it to come back to you. Right that's the symptoms.
We have checked that its boosting properly and holds 12psi well once up and running. I checked the fuel flow yesterday to see if we had an air leak or a dodgy lift pump. The flow out of the return pipe at idle was around 1 Litre/minute which I thought was plenty. After that I'm stumped.
Any ideas would be gratefully received.
Thanks
Check the basics (fuel filter, sedimenter, etc...) but for that age of engine, it'll probably be the top end of the fuel (injection) pump.
There's a mechanical system on the top of the fuel pump, which has a feed from the turbo. As the turbo picks up, the pressure is also increased in the top of the injector pump, which in turn causes it to deliver more fuel.
This mechanism and some of the associated linkages can seize.
What to do now??
Locate where the turbo pipe enters the injector pump, pop the top off (4x threaded screws or bolts) and have a look. You should find a rubber diaphragm and under than is the mechanism in question... Just push down on the bolt on the top to see if it moves up and down.
If not... Start off with a drop of WD40 (but not much!!!).
Bear in mind that there are other linkages which sound be affected.
M
There's a mechanical system on the top of the fuel pump, which has a feed from the turbo. As the turbo picks up, the pressure is also increased in the top of the injector pump, which in turn causes it to deliver more fuel.
This mechanism and some of the associated linkages can seize.
What to do now??
Locate where the turbo pipe enters the injector pump, pop the top off (4x threaded screws or bolts) and have a look. You should find a rubber diaphragm and under than is the mechanism in question... Just push down on the bolt on the top to see if it moves up and down.
If not... Start off with a drop of WD40 (but not much!!!).
Bear in mind that there are other linkages which sound be affected.
M
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