Vehicle & Technical > Range Rover

HELP

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rangerider:
With no OBD port its keep swapping bits on early EFIs :(

The problem is swapping bits and knowing for sure that your replacement part is good. I had a stack of ECUs that were all supposedly good, only 1 would work properly in any truck, 2 more seemed to be picky about what they would work with.

I had a similar problem with a C reg efi, it turned out the engine was breathing a little hard and oil was gumming up the MAF & intakes. Starter spray and letting the breathers run to a collector sorted that one out for a while. The real fault when we had time to work on it was overfuelling. Check spark plugs for oil or over fuelling contamination. Temperature senders can fail leading the ECU to always over fuel (thinking cold start) this will soon foul the plugs within a matter of hours or days depending on usage.

gords:

--- Quote from: "rangerider" ---I had a similar problem with a C reg efi, it turned out the engine was breathing a little hard and oil was gumming up the MAF & intakes.
--- End quote ---

MAF ... what's that then? :?

rangerider:
Sorry, Mass AirFlow sensor, on the intake pipe between the airbox & the plenum chamber. Measures airflow so the ecu can decide how much fuel to pump in for a given throttle setting. I guess I spent too long under the bonnets of rangies

Henry Webster:
I've had a similar no-start problem after an AFM (or MAF) went down.  Ran the engine on the rich limp home mode for a bit (AFM disconnected - not recommended).  Fuelled up the plugs and then wouldn't start again.

New AFM and a new set of plugs sorted it.  What do the plugs look like?  It may be that it coked the plugs up if/when you had an AFM problem.  

If the AFM is at fault disconnecting it and seeing whether it will start may highlight the fault.  If it starts AFM probably at fault.

You can do some diagnostics, either with the LR TestBook, or by going through a routine of tests.  I think that the Haynes manual details these, otherwise there is a elctrical test manual that Land Rover published.

H

Range Rover Blues:
Ah, careful there, MAF is the sort of thing used on a hotwire system, the 3.5 flapper is a VAF sensor, they are different things entirely.

If it's a hot-wire system it should be pretty tolerant.  I forgot to reconnect my MAF the other day, only realised when I saw this black cable not doing anything.  I'd been driving it round for a while by then.

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