Hondata

Dear,

This is the car setup: Honda civic EP3 european model, 2004, with injen CAI and Hondata KPRO v3
Tuned by Exztra Inter Tuning recently in Belgium.

I have had this problem for couple of weeks now on cold start 14 degrees celcius outside temperature.
When I start my engine and it idles at around 1800 rpm, it drops pretty fast in idle to 1500.
Everything goes well but sometimes under 3500 rpm the car stutters.
Then after 5 min engine management light turns on and stays on until i stop the car.

When I start it again it works perfect without engine light being on, so on warm engine there is no problem.

The primary oxygen sensor was replaced recently because the old one was believed to be faulty.
Right after the oxygen sensor replacement when i started the engine, the engine light was on as well.
The engineer debugged the error code and it said primary oxygen sensor, he reset the fault and i continued driving.
It did not come back until the next time i started the car on cold engine.

Any ideas? Can this have something to do with the temperature corrections on cold engine?
Or the TPS? Car running too rich or lean or just a faulty oxygen sensor that he used?

Best regards and thanks in advance!

Dimitri

Ok i will try giving the info tomorrow, since i have to get the ECU out of my car for it.
I will try making a datalog of it as well, and upload the calibration.

Can i check the fault codes what they mean with hondata?
I dont believe CEL warnings are getting read in Hondata?
Maybe this is an option you can provide in the future? Then we dont need an OBD2 scanner to read them.

I'll provide the updates this evening.

This is my calibration already:

You can read the error code using KManager. A datalog of the problem occurring would also help.

Yes i'm gonna do it in the next hour.
Thanks for replying, can you check if the tune is well without the logging?
You need a log of hondata Kmanager or hondalogger?

Ok my logging seems to big: 25 mb

but i got the error code: 02 sensor high voltage and the serials:

Make a shorter recording then so we can see what you are describing.

Lol isnt there a way too shorten it the one i have?
The error did not come back today.
Any idea what the error code means?
What is the maxsize of an attachment here?

You can define new start and end points in the datalog in the Graph window.

Ok ive found it the fault did not comeback, the stuttering however is still in place between 3000 and 3500 rpm:
I have noticed that enable emissions error checking is unchecked, i have a standard catback with primary oxygen and secondary present,
does it need to be on or can it be kept of?

0-5 min 5-10 min 10-15 min

It is the o2 sensor and/or o2 sensor wiring. My guess is that the o2 heater is broken / not working / wiring broken, as the sensor does work after 3-4 minutes. Before then, however, it is running a -27% fuel trim, which is why the engine is not running so well.

There are no error codes reported in any of the datalogs you have provided.

Ok thnx guys
Yes when taking the datalog it did not happen