Vehicle & Technical > Range Rover

Fuel system problems.

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skip:
Here I go again :roll:  

I thought I'd post in the rangie section as there seem to be far more V8 lovers here :lol:

I've been having trouble with my dico running on petrol, missing and general poor/eratic performance. so I took it to my local man with a rovacom.

Here's what he came back with.

Code 34 injector fault bank A
Code 36 injector fault bank b
Code 23 fuel supply

I already replaced the fuel filter incase that was the cause so i've eliminated that but i'm wondering if the first two faults would be cause by a lack of fuel pressure?

Infact any advice of what is the most likley cause would be appreciated as I can't afford to pay anybody else to do the work for me.

Thanks

Pete.

Range Rover Blues:
Perticulary if it's got Lambdas the ECU will figure out a missfire as being caused by 'something'

Mine reports a missfire on bank A that I can't even detect, thing is it won't tell you when it happened or if it's cleared up.

Here'a a tip, if you disconnect the battery then the ECU resets itself and clears the faults, so do this a few days before hooking up Rovacom and you will only see current faults.

As for the cause, could very likely be a fuel supply problem but the ECU can't measure fuel pressure so it's guessing that's the cause.

Get hold of the Range Rover Haynes manual, it has a comprehensive test section for the hot-wire, one of which is to check that all 8 injectors are still connected properly.  If you strip the engine you can also measure the output of the injectors, though I've never done this.

Also check the fuel supply pressure.

skip:
Thanks RRB

The chap read the ecu twice, once when I took the Disco in and then after he did a reset. The reading before also reported that there was a fault on both lambda sensors, but I think that was caused by me running the gas to the very last minute and ending up with a very lean mix :oops:

I think the first thing is to get a range rover haynes comic then find somone who has a suitable equipment to test the fuel pressure, I'll get into more complex stuff after that if need be.

Thanks again

Pete.

Range Rover Blues:
EFi fuelpressure is only about 23? PSi, so a Gunson's low guage should be able to do it, otherwise a fairly common pressure guage (like you find atop some tyre inflators) will do, the pressure is less than you put in your tyres IIRC.

My lambdas somethimnes sulk if my LPG system is playing up.  Do you have a single point/multipoint system with feedback or is it a drawthrough system?

You can dissable the lambda by swapping the tune select resistor.  All you need to know about that is in the comic too :)

skip:
I've got a mixer system with lambda control, when I first go the disco it was running very lean but i since adjusted that and all has been well.

I think I have found a copy of the official land rover diagnostic manual,       [/url]                  http://www.g33.co.uk/images/PDFS/14cux_fuel_injection.pdf                     [url]

i'm going to try some of the procedeures provided, hopefully it'll shed some light on the situation.

BTW is there a test port on the fuel rail? i've not noticed one.

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