Thread: Why I Never take my Landy to a mechanic

Originally Posted by davrac

Ah yes I remember some of the old Nissan SD33's with a throttle butterfly. But on later diesel engines are they not just a butterfly related to EGR rather than something that controls the amount of revs like the throttle on petrol engine. I have just never heard of a EGR butterfly classed as a throttle body as regarded on a petrol engine. Totally different function. yes or no? Please correct me if I am wrong.

Yes Totally , An EGR certainly is as different to a Throttle Body as a Sparkplug is to an Injector.

The thing that I found bizarre and prompted me to post the topic is someone had actually listed a TD5 EGR as a TD5 Throttle Body on Ebay - and the seller is a professional motor organisation

Originally Posted by davrac

Ah yes I remember some of the old Nissan SD33's with a throttle butterfly. But on later diesel engines are they not just a butterfly related to EGR rather than something that controls the amount of revs like the throttle on petrol engine. I have just never heard of a EGR butterfly classed as a throttle body as regarded on a petrol engine. Totally different function. yes or no? Please correct me if I am wrong.

Yes only for EGR throttling on a Td5, not a Throttle body as such. I mentioned it as an illustration as there are jap diesels that have them, as you have seen. For example the 2H diesels use a throttle butterfly to control vacuum signal to the injector pump vacuum governor, maybe he has had experience only with these types of engine?

JC

The so called throttle body serves two purposes on the latter common rail diesels. One as mentioned assist the EGR on overrun or trailing throttle and the main reason is to prevent a rough shut down or "overrun on shut down" if you like.

Is JC and others have mentioned, some of the older inline pump diesels use a vacuum line either side of a throttle body to work a diaphragm that sits against a damper and spring to control fueling via the rack.

Originally Posted by bob10

It was whispered in my ear, when I purchased my EGR blanking kit, it might be a good idea to keep my engine cover in place , and either do all maintainence myself, or use trusted LR mechanics.Whether this advice was designed to frighten me into giving major work to this particular mob, or whether there was a genuine reason , who knows. [but it does make me feel deliciously evil , much like a mini Moriarty ] Bob

But who but an affectionado would know you had blanked off anyway?

There are a few of these TVR twin throttle body adaptors for 14cux systems going cheap

ROVER V8 ENGINE TVR EFI TWIN PLENUM THROTTLE BODY CONVERSION | eBay

Benn doing this job for 19 years now and there are some real bad ones out there but this is why we are all on the forum is it not...

Well I have a 2.25 Land Rover Diesel that has a throttle body, it is used to supply a Vacuum to the brake booster, JDNSW will know this engine, as I bought it off him a few years back, Regards Frank.