Do early Range Rovers had Lambda sensors ?

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RoverDave

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Hi Everyone,
This is my first post and it starts with a very important question:

Do early (up to 1988ish) range rover 3.5 V8's with EFi (the flapper type) have Lambda sensors ?

I've looked around and can't this info anywhere, I know the 3.9 V8's have the Hotwire EFi and they have the Lambdas.

Thanks, Dave
 
RoverDave said:
Hi Everyone,
This is my first post and it starts with a very important question:

Do early (up to 1988ish) range rover 3.5 V8's with EFi (the flapper type) have Lambda sensors ?

I've looked around and can't this info anywhere, I know the 3.9 V8's have the Hotwire EFi and they have the Lambdas.

Thanks, Dave
Click to expand...

You wouldn't have lambda sensor(s) unless you were intending to run closed-loop fuelling and to do that, you would also need catalyst(s) fitted. I don't think they started fitting cats until the 3.9 v8 came out in 1989, so the answer to your question would be no. The 3.5v8 only ever ran open loop fuelling and so wouldn't need a lambda (HEGO) sensor.
 
bwarb said:
You wouldn't have lambda sensor(s) unless you were intending to run closed-loop fuelling and to do that, you would also need catalyst(s) fitted. I don't think they started fitting cats until the 3.9 v8 came out in 1989, so the answer to your question would be no. The 3.5v8 only ever ran open loop fuelling and so wouldn't need a lambda (HEGO) sensor.
Click to expand...
Not quite,you dont have to have cats to run closed loop,lots of RR classics and Discos are running around catless,but still with oxy sensors,esp when LPG is fitted.
The 3.5 ran closed loop in discos from about 92 on till it was downgraded to a 3.9.
 
eightinavee said:
Not quite,you dont have to have cats to run closed loop,lots of RR classics and Discos are running around catless,but still with oxy sensors,esp when LPG is fitted.
The 3.5 ran closed loop in discos from about 92 on till it was downgraded to a 3.9.
Click to expand...

Just checked, apparently HEGO sensors were fitted to the RR 3.5 V8 in some markets from 1986-1990.

LPG installations are not really too relevant as they are all aftermarket installs and so could be fitted to any model and any year. In those cases, any combination of sensors and actuators could be fitted to any model/year.....
 
Rover Dave can you tell us exactly what you are wanting to do so we can give you specific answers rather than end up with a pointless row about markets/model years.
 
eightinavee said:
Rover Dave can you tell us exactly what you are wanting to do so we can give you specific answers rather than end up with a pointless row about markets/model years.
Click to expand...

Would agree. However, I've not seen a late eighties RRC with Lamda and Cats. Mine is a '91 classic, no cats (hotwire). I'm reasonably confident all the UK flapper systems did not have cats so would not have lamda sensors either. In any event, as I understand the injection system, you can "remove" the lamda sensors by changing the tune select resistor.

The values for the tune select resistor are, if memory serves, shown in the Haynes book of lies but the RPI Engineering website has more detail on this. However, not sure if the same is true for the flapper system which I believe is a Bosh system not Lucas.
 
Hi Chaps,
Thanks for all the replies and comments etc.

Right, the reason I'm asking about the Lambdas is I have a Rover SD1 3.5 V8 and want to fit a fuel injection system from an early Range Rover (the Lucas Flapper type) and was told that the Range Rover has Lambdas and as the Rover SD1 doesn't then the injection system won't run properly. But I personally didn't think the early RR's had Lambdas and as I couldn't find a definite answer anywhere, I thought I would ask you guys, the people who actually own a Range Rover. So hence the question.

I hope this makes things a bit clearer and sorry for not saying it in the first place.

Dave
 
RoverDave said:
Hi Chaps,
Thanks for all the replies and comments etc.

Right, the reason I'm asking about the Lambdas is I have a Rover SD1 3.5 V8 and want to fit a fuel injection system from an early Range Rover (the Lucas Flapper type) and was told that the Range Rover has Lambdas and as the Rover SD1 doesn't then the injection system won't run properly. But I personally didn't think the early RR's had Lambdas and as I couldn't find a definite answer anywhere, I thought I would ask you guys, the people who actually own a Range Rover. So hence the question.

I hope this makes things a bit clearer and sorry for not saying it in the first place.

Dave
Click to expand...

If you are planning to transfer the complete engine management system (i.e. sensors/actuators etc.) from an SD1 onto your RR, then presumably you'll also be using the SD1 ECU as well?

In that case it doesn't really matter what RR's of the same era had fitted, so long as you transfer over the complete SD1 system, it will all match. Just don't try to connect things in that are already on the RR that weren't on the SD1 as the SD1 ECU won't be set-up for them .........
 
The Mad Hat Man said:
i think he wants to do the opposite - "I have a Rover SD1 3.5 V8 and want to fit a fuel injection system from an early Range Rover "
Click to expand...

DOH !

Should have read it all more carefully. If you are transferring over the complete system, presumably you have the engine loom off the RR (without it you are really stuffed as trying to buy the sensor/actuator connectors could be challenging).

Check the loom to see if there is a HEGO connector in it (and check inside to see it it's was used). I think it should be a three or four wire round connector.
 
Hi bwarb,

Yes I have the RR wiring loom (I like a challenge, but not that big!) there isn't an extra connector on it (good point) but there are 2 wires that have been cut ? but they could be a supply feed ? maybe....

Dave
 
RoverDave said:
Hi bwarb,

Yes I have the RR wiring loom (I like a challenge, but not that big!) there isn't an extra connector on it (good point) but there are 2 wires that have been cut ? but they could be a supply feed ? maybe....

Dave
Click to expand...

This may help, HEGO's on RR's have either 3 or 4 wires, and one of those wires will go back through the loom to the ECU connector .....

You could also trace every wire on the ECU connector and see where they go ?
 
Hi Bwarb,

Thanks for the info and help, I will do just that, I'll trace every wire back to the ECU plug and if I can find out whats meant to go to each pin in the plug (google search or something) then I can double check as I go.

Anyway, thanks for that great bit of thinking, I now have something to go on.

Dave
 
Rover Dave,you have an oppertunity here to get the best of both worlds,but you wont get it with a flapper system.They were never really much cop compared to the Hot wire system used on 3.9's and some 3.5 Disco's.The main problem being that the ECU's are dying with old age and cause allsorts of idling/running issues and decent ones are hard to find.
The Hotwire system is a different story altogether,much more reliable and more efficient.It is also younger so parts will be available longer.It has proper control of idle speed, can run open or closed loop and can store faults.
The whole Hotwire loom comes out of the car in one piece so is easy to refit in any other car.I would use it closed loop with oxy sensors,but with a change of tune resistor the same ecu will no longer look for their output.
 
eightinavee, Well thankyou very much for that, I was just starting to get somewhere and you throw a spanner in the works !!! lol

Yes, I can now see how the Hotwire system would be so much better, I knew it used Lambdas so thought it would be no good for an SD1, but you say the Lambda input can be switched off, this I didn't know, so now I'm thinking I might be better off with the hotwire system. I have just bought the flapper type and think I should have re-searched all this first!! I will soldier on with it, but I'll always be thinking of the hotwire system and be wondering if I should have gone for that instead !!

Dave
 
Sorry about that ! Dont be worried about the oxy sensors if you do go the hotwire route - its worth the little effort it takes to fit them.If you get stuck with either system I still have loads of bits in stock for both.
 
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