FL2 faulty throttle body?

Hi all,

I recently bought a 2007 FL2 with 2.2 TD4 engine. I went to get the yearly MOT done which resulted in some skipped heartbeats and money loss. The engineer performing the MOT came quite early to tell me that the engine let out a "bad" noise during emission test. Engine speed was around 4k rpm and the engineer shut off the engine immediately after he heard the noise. The MOT was discontinued and the engineer evaluated that the engine might have jumped timing.

I tried to start the engine to evaluate myself if the engine is seized due to jumped timing or if the noise was something else. The engine tried to start but there was some clicking and knocking that there was not supposed to be. So I got the car towed to a workshop that is specialized in diesel engines. They managed to get engine running, there were no additional sounds heard but on the test drive they managed to get a faut code from the throttle body. They did not find any signs of jumped timing or other possible faults, so they replaced the throttle body and fuel filter.

The engine works fine for now, but I'm curious about the throttle body. Could it be that clicking and knocking that I heard came from the throttle body that possibly had gear failure or something similar? Maybe the flap inside the throttle body flapped freely against the throttle body or something? Any ideas or similar experiences? Thank you for your answers in advance!

Akroni said:

Hi all,

I recently bought a 2007 FL2 with 2.2 TD4 engine. I went to get the yearly MOT done which resulted in some skipped heartbeats and money loss. The engineer performing the MOT came quite early to tell me that the engine let out a "bad" noise during emission test. Engine speed was around 4k rpm and the engineer shut off the engine immediately after he heard the noise. The MOT was discontinued and the engineer evaluated that the engine might have jumped timing.

I tried to start the engine to evaluate myself if the engine is seized due to jumped timing or if the noise was something else. The engine tried to start but there was some clicking and knocking that there was not supposed to be. So I got the car towed to a workshop that is specialized in diesel engines. They managed to get engine running, there were no additional sounds heard but on the test drive they managed to get a faut code from the throttle body. They did not find any signs of jumped timing or other possible faults, so they replaced the throttle body and fuel filter.

The engine works fine for now, but I'm curious about the throttle body. Could it be that clicking and knocking that I heard came from the throttle body that possibly had gear failure or something similar? Maybe the flap inside the throttle body flapped freely against the throttle body or something? Any ideas or similar experiences? Thank you for your answers in advance!

Click to expand...

If the throttle body change has solved the noise etc then that was the problem, running it at 4000rpm on the MOT most likely damaged the already faulty plastic cogs inside the throttle body, did they give you the old throttle body back, if so check it out or if not ask for it back to check.

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There is a fix.
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Why do so many MOT places still thrash the guts out of a diesel? There's absolutely no need to do that on a modern electronic controlled diesel, as the governor isn't mechanical in operation.
Ok my MOT garage is a bit anal about rust, but at least they test the engine correctly.

The old throttle body is already in the trash so I can't determine the condition of it.

Some MOT places in Finland are horrible when they do the emission test. I'll probably get the emissions tested in a different place next time.

I've been thinking about the situation and come to a conclusion that the clicking and knocking that I heard from the engine bay when starting the engine after the emission test might have come from somewhere else than the throttle body. It wasn't in sync with the engine rotation so might just be a loose part or something similar.

Also good if members please state where they are based, in my opinion it should be part of joining the forum you have to state where you are from UK and area ie West midlands