1992 200tdi 90 High Reving Engine on Start Up🤔

Mepps · Sep 9, 2024

Hello
On the search for some suggestions please.
So, progress to date & current challenge.

Engine starts up ok (Sounds Strong) but immediately goes to high revs and I have to shut engine off.

I have drained fuel from tank, cleaned lines, replaced glow plugs, new fuel lift pump, replaced fuel filter.

Sounds like choke is stuck open or could it be injectors ?

Appreciate any information

kevstar · Sep 9, 2024

Mepps said:
Hello
On the search for some suggestions please.
So, progress to date & current challenge.

Engine starts up ok (Sounds Strong) but immediately goes to high revs and I have to shut engine off.

I have drained fuel from tank, cleaned lines, replaced glow plugs, new fuel lift pump, replaced fuel filter.

Sounds like choke is stuck open or could it be injectors ?

Appreciate any information

Assuming you have wound the accelerator cable all the way off.

Mepps · Sep 9, 2024

Hello, yes, disconnected accelerator cable . Thanks, I should have mentioned on post .

kevstar · Sep 9, 2024

Mepps said:
Hello, yes, disconnected accelerator cable . Thanks, I should have mentioned on post .

Seized boost pin perhaps, remove the 4 screws on the top plate on the injection pump & remove the boost pin.
Clean & re-fit. Vids on youtube mind an mark/take note on the positioning on the pin.

Mepps · Sep 9, 2024

Sounds interesting, I will definitely try your suggestion re: boost pins
If successful, I will let you know.
Many thanks

dag019 · Sep 10, 2024

I assume it was running normally before and hasn’t always been like this with you?
It does sound like the fuel rack is sticking so definitely worth trying the above.

But this might be an odd suggestion here and only really applicable if someone has been messing with the pump. But could try adjusting the idle screw? If that has been wound all the way in by someone playing with the pump not knowing what they are doing it could do this.

Mepps · Sep 10, 2024

Hello,
I only took ownership of vehicle in March this year.
My First Defender ...
Engine was not running as parts missing. Probably 10 years or so off the road.
It's a low mileage jeep and mechanic did look after when it was in use as I was familiar with jeep before it moved to me.
I did check idle screw & will check again. If I have any success, I will share.
Either way, I am enjoying the process and learning as I go.
Thanks for your help

Mepps · Sep 10, 2024

kevstar said:
Seized boost pin perhaps, remove the 4 screws on the top plate on the injection pump & remove the boost pin.
Clean & re-fit. Vids on youtube mind an mark/take note on the positioning on the pin.

Hello Kevstar
Your diagnosis was correct & thank you.
Much appreciated
Attached photo

, don't laugh, ha ha
All cleaned now & engine is idling & reving nicely.

I replaced clutch cylinders and pipes etc and now after testing, we have a clutch.

Next up is drive shaft & rear diff to be repaired / fitted. Lots to do, making good progress.

Mepps · Sep 10, 2024

Hello,
High Reving on start up is now resolved.
Stuck / Seized boost pin was the issue.
Removed/ cleaned/ lobricated etc .
Seems to have worked. Engine sounding great.
Thank you all for suggestions & your help.
Great Forum

kevstar · Sep 10, 2024

Mepps said:
Hello Kevstar
Your diagnosis was correct & thank you.
Much appreciated
Attached photo , don't laugh, ha ha
All cleaned now & engine is idling & reving nicely.

I replaced clutch cylinders and pipes etc and now after testing, we have a clutch.

Next up is drive shaft & rear diff to be repaired / fitted. Lots to do, making good progress.

Superb, glad you got it sorted well done mate.

1992 200tdi 90 High Reving Engine on Start Up🤔

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