Lambda Sensor

[BigGingerBob]

Hello,

Just a quick one, I am going to buy a lambda sensor tonight and a kind person on here is going to help me fix it. However, there are a number available. The car is a year 2000 Red Rose.
We have;
1. http://tvr-parts.com/tvr-parts/part-details/tvr-m1...
2. http://tvr-parts.com/tvr-parts/part-details/tvr-m1...
I hope it's not the £150 one although sods law says it will be.

[clive f]

Its a 3 wire or 4 wire sensor, check your plug to the sensor lead to find out.

[m4tti]

You need to remove the bonnet and check whether its a 3 or 4 wire sensor...

Edit- Clive got there before me. The sensor wiring emerges through the grommet on the passenger side inner wing.

How did you diagnose its a lambda fault.

Edited by m4tti on Sunday 25th January 21:59

[BigGingerBob]

Efi fault on the display that doesn't disappear when the car is driven long distances.

[m4tti]

I wouldn't rely on that fault. I'd want to look at the voltages of the sensor switching via the mbe software and see how it behaves.

[clive f]

m4tti said:

I wouldn't rely on that fault. I'd want to look at the voltages of the sensor switching via the mbe software and see how it behaves.

this

[MrChips]

I've got a couple of spares in the garage if you want? One of them was switching slow but the other was perfectly fine. I stupidly didn't take note of which was which so am selling both.

[BigGingerBob]

clive f said:

m4tti said:

I wouldn't rely on that fault. I'd want to look at the voltages of the sensor switching via the mbe software and see how it behaves.

this

And if the voltage was low/ it wasn't switching properly then what would be the diagnosis?

Mr Chips, YHM

[BigGingerBob]

If it makes any difference, the car runs absolutely spot on, even when I started it at -1 the other day.

The EFI warning occasionally disappears for about half a second when I lift off the throttle on the motorway.

[m4tti]

Do you have the cable and software? Otherwise this is pure guess work.

Edited by m4tti on Monday 26th January 11:33

[BigGingerBob]

No software or cables I'm afraid

[m4tti]

I think that's your next port of call before buying any parts. You can download the PC software for nothing or buy the android version. The cable is about 20 quid. The dash pod fault could be a complete red herring.

Falling that, if you don't fancy doing any of the above leave it with a specialist.

[BigGingerBob]

I will, do you know what cable I need? On the other thread they were talking about Cerberas and so I'm unsure whether it's the same cable.

[m4tti]

You can use the same cables as mentioned in the cerbera thread.

[Sagi Badger]

Throttle pots out of sync, this will give you an EFI fault.

You will need to balance throttles, described on here many times, and then reset throttle pots. The fact it shows when you lift off is symptomatic of this as any sluggishness in the return of any butterfly in either of the set of three will defeat the T pot return spring. The ECU spots a difference in the T pots % open and raises an EFI fault.

You will need the cable as I don't think the 12 flicks of the key resets T pots, just adaptives.

J

[BigGingerBob]

The revs don't fall as much as I expect them to either. Say if you blip the throttle, the revs don't shoot up then down again, they shoot up then hover and then come back down. Would this be linked?

[m4tti]

Again you'll need the software to determine where the ecu thinks throttle potentiometers are at. If the throttle bodies need balancing you'll need a synchronometer....

[BigGingerBob]

I had a day off yesterday so I took a trip to Bespoke Performance.
It was the air flow sensor so they took it apart and did something. I was too busy sitting in different cars to watch!
£48 for half an hours work so I'm not complaining!