MPG drop with new injector

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Creeeg

Well-Known Member
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Location
East Sussex
Anyone else every experienced this?

My Td4 had to have an injector replaced a couple of weeks ago. It was done in an indy garage and they popped a recon Bosch in (thankfully without hassle).

Prior to the replacement I was getting about 35mpg. Visually the fuel gauge would just start to drop from a brimmed tank after about 120 miles (yes, I know you can't trust it, but it's always been like that). Post-replacement, the gauge started dropping after only 90 miles.

I'll do the proper mileage checks after I next fill up, but, currently, it looks like my MPG figure has dropped, which is a bit annoying. Naturally I'm now well happy the vehicle's starting better than it has done for months, but I'm hoping the new injector just needs to "bed in" and normal service will be resumed soon.

The original injector was leaking back badly. The only thing I can think is that some of the fuel I'm now burning with the new one was just going back to the tank with the old one. The only thing that goes against that is that I'd have expected performance to be down as it was, but it wasn't. Once it fired-up (eventually...) it ran smoothly. It feels slightly more torquey with the new injector, but that's about it.

Ideas where my missing MPG has gone anyone?
 
Probably should have said - the garage did say that the other three are "weak, but serviceable currently", but assured me they are fine for the mo. They said that in an ideal world all four should be replaced at once, but it's impractical given the cost of each injector. Fair advice, I'd say.

So it could be that I suppose. I don't feel inclined to go out and spend £500 - £600 on the other three just yet though. Plus the slide hammer to get them out :)

Besides, I recall seeing quite a few others here replacing just the one injector with no probs as far as I can remember. Thanks for the idea tho.
 
Anyone else every experienced this?

My Td4 had to have an injector replaced a couple of weeks ago. It was done in an indy garage and they popped a recon Bosch in (thankfully without hassle).

Prior to the replacement I was getting about 35mpg. Visually the fuel gauge would just start to drop from a brimmed tank after about 120 miles (yes, I know you can't trust it, but it's always been like that). Post-replacement, the gauge started dropping after only 90 miles.

I'll do the proper mileage checks after I next fill up, but, currently, it looks like my MPG figure has dropped, which is a bit annoying. Naturally I'm now well happy the vehicle's starting better than it has done for months, but I'm hoping the new injector just needs to "bed in" and normal service will be resumed soon.

The original injector was leaking back badly. The only thing I can think is that some of the fuel I'm now burning with the new one was just going back to the tank with the old one. The only thing that goes against that is that I'd have expected performance to be down as it was, but it wasn't. Once it fired-up (eventually...) it ran smoothly. It feels slightly more torquey with the new injector, but that's about it.

Ideas where my missing MPG has gone anyone?
I can't think of any reason why this would cause increased fuel consumption. It could be coincidental and due to falling temperatures.
 
its certainly ok to replace just the one injector, and as they are £160 a time just as well ,(landrover price )
also if you need a new injector , source them from a rover dealer, i found a saving of £60 each
 
The injectors in the td4 dont need coding into the ecu but you need to make sure the numbers on the injectors match as i believe there are three different sets for the td4 i no this as we have just done my mates freelander injectors.
 
Am I right in thinking that the 3 types refer to early 2.0DL then early TD4 pre 03/5 then post 05 and also a different one for the Auto. But my experience is they a have either different lengths or plug fittings.
 
There are two types of injector manual transmission and auto which look same but give different volumes to cylinders,:)
 
There are two types of injector manual transmission and auto which look same but give different volumes to cylinders,:)

Well I have injectors on my 03 manual that are different from a second hand 05 one - the 05 is longer and has a different plug unless that is an auto one and has not been identified as such by the seller.
 
It's definitely the correct injector for my engine (manual). Maybe it is as Chaser suggests: just the cold affecting it.

No coding to the ECU is required either. I think that's on the Td5 engine.
 
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