T350 lambda values

Author
Discussion

non_linear

Original Poster:

278 posts

82 months

Sunday 13th May 2018
quotequote all
I'm new to engine management software, so be gentle!
I've got an intermittent problem with the engine stuttering and cutting out. Most of the time it is fine though, which makes it hard to track down. A big thank you to EvoOlli for the MBETool software, which I have running on an old laptop under Win XP.
Logging the lambda values I get the following, which I assume is not right! Does this look like an earthing problem?
The engine was actually running well during this run.


cinquecento

553 posts

224 months

Monday 14th May 2018
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From my knowledge of Narrowband sensors that looks normal..they bounce between 0 and 1 volt depending on air fuel ratio

non_linear

Original Poster:

278 posts

82 months

Monday 14th May 2018
quotequote all
Thanks. I need to read up more on engine management!
I was concerned that the blue channel was dropping low during the warm up period and wondered whether there was a loose connection somewhere.

nawarne

3,088 posts

259 months

Monday 14th May 2018
quotequote all
The lambdas will take a time to warm up from cold start....hence the gradual climb to +1V indicated on the graph.

Then as other poster said, they should 'cycle' between 0V (or low figure) and +1V with engine running and hot.

Nick

Penelope Stopit

11,209 posts

108 months

Monday 14th May 2018
quotequote all
Have you carried out the earthing modification to the sensors?

non_linear

Original Poster:

278 posts

82 months

Tuesday 15th May 2018
quotequote all
Thanks Nick.
Hi Penelope. I have not done the earthing mod yet, it's on my "to do" list! Have you done it? Worth doing?

cheers
Stuart