Thread: EMS thinks lean - why?

I have never heard that, the best way is to get under and see if there is any movement anywhere in the propshaft

Does your beast have before and after cat sensors?

The after cat sensors were only fitted to NAS vehicles as far as I know and they are there just make sure the cats are working correctly.

I have found that ebay out of the US seems to have the best prices for O2 sensors

Steve

I hope there are rear sensors I just ordered 2 off Amazon!!

"UJ slack is more evident with handbrake off and in Neutral, but chock the wheels first!"

I think I completely misunderstood

What a day. Going to bed.

Originally Posted by Tikka7mm08

I hope there are rear sensors I just ordered 2 off Amazon!!

There are only two, 4 wire bosch type. I have used generic ones with no problem, you just need to re-use the plug. The sensors come with a crimp kit to make things easy. Mine were $16 each, try and beat that

All good info.

UJs - yep, get under and wiggle in every direction with your hand. Should be NO movement.

You will only have 2xO2 sensors. Both pre-cats. Only NAS (USA) vehicles have post-cat sensors and they only check the cat performance. I do not believe they are swappable. Also beware that GEMS have 0-5v O2 sensors and THOR has 0-1v sensors (wide band vs narrow band).

So, the 'no oscillating' you are seeing on your Torque display may be monitoring the non existent post-cat O2 sensors. Also put up the display which monitors the fuelling mode, closed loop or open loop. Its handy.

Your min MAF reading looks low to me. If your ECU thinks less air is coming in, then it will put less fuel in, then your O2 will read lean.

To recap:

- revved car in neutral instead of wiggling UJ;
- ordered wrong MAF although this shouldn't be a great issue as usable;
- misinterpreted OBD reading and ordered REAR O2 sensors I apparently don't even have;
- even my self-deprecating sense of humour is struggling to keep up LOL. Gotta be able to laugh at yourself when you cock things up this badly...

On the upside my front O2 sensors are flicking nicely between .1 and .9v so at least they are ok. This morning will look for leaks as suggested...then try the MAF replacement when it turns up.

Yes I ran thr engine loop...it is closed when accelerating and open when coasting foot off...

...just note that Torque showed the rear sensors are 'active' or present and that O2 heating was fine but sensors incomplete.