23 replies to this topic

[Puddles]

Genpop,

 

Yes I flushed the manifold today while installing the new CTS. 

 

I will try to do a log tomorrow using Mems-Rosco before and after I do a ECU reset. 

 

Do you have a log for a healthy SPI that I could review for reference? 

[Puddles]

So I attempted to run a log using MEMS Rosco and MEMS Scan with no success. I keep getting an error along the lines "Error Communicating with ECU on COM3" and was unable to establish a connection. I have confirmed that I am using the right Com port for the cable. 

I dont know if this is a common issue people have that someone might have a solution to? I think it might be the cable I have, but I have a couple more tricks up my sleeves on the software side of things so I will attempt to give it another try tomorrow.

[genpop]

Have a look to the powerpoint presentation.You have to choose the com port within options on top of the window.

[Puddles]

Genpop,

 

I understand that I have to select the correct com port within the options. I confirmed that I was using the correct com port, and than tried several times to adjust the com port through device manager along with mems rosco/mems scan with no success.

 

I did see something that looked like a bunch of .jpeg that were from a power point presentation. Could you link me to the power point presentation that you are referring to?

 

Also, do you have a log from a healthy SPI i can look at for reference?

[genpop]

In your mems-rosco folder there is a "mems-rosco-presentation.pptx file. It is in english, "mems-rosco-Anleitung" is in german, slightly different but newer.  In the sub folder logs, there are some logfiles. At the moment I have no perfect logfile.

What   interface do you have? If it is not a 5V fdti  it is not garantied that it will work. 3 Volt from arduino do not work. 5V with silicone labs IC will work but you have to load the aprobiate driver..

[genpop]

Hi Puddies

download mems-rosco again. There was a small bug when loading a second  logfile.

Addionally theres a logfile "nearly ideal_high IAC-txt"

That is a good example. User is satisfied  but IAC could be 10 to 15 steps lower.

[Puddles]

Ok,

 

So I got MEMS Rosco to connect today unfortunately my computer blue screened while running the first log. I wasn't able to clear the faults or do a ECU reset through MEMS Rosco, but was able to connect using MEMS Scan and reset all faults and the ECU. 

 

After doing a ECU reset I started the car and it ran fairly smooth although it was already at 65C when I did this. I find that when the car is around this temp there is about a 25% chance it wont have a hunting idle when I start it. So I'm unsure if this was caused by the ECU reset or just a coincidence. I let the car idle for about 5 - 10 min and than took it out for a 10 minute drive.

 

After letting the car cool down for a couple of hours I connected MEMS Rosco and ran the following log.  2020-06-13_20.32.txt   380.33K   8 downloads The hunting idle was back. It looks like I forgot to change the settings back to Celsius. You will also notice that the cable came loose at about 6:45.

 

I might try to do a ECU reset and run another log while its cold and been sitting overnight.

 

I'm running out of ideas here. A carb conversion or VTEC swap is starting to look really good. 

 

 

[genpop]

Hi Puddies,

the log file looks not so bad.Temperature is at 85 degrees, closed loop works ,IAC at 44. But rpm never smaller than 930 . So you could try these things.

change long term fuel trim on the emission tab

change idle speed  on the emission tab

lower iac steps on the emission tab

if nothing of these three helps you may reset ecu so these parameters are set back to their originals.

As you have already changed the ecu it could be a mechanical problem too.

Slightly turn out the screw which should not be touched.This will close the throttle a bit.You can check that on the tab  all readings. Throttlepod and throttle angle should change.

As well you can check the throttle pot (engine off but ignition on) by depressing the gaspedal, if throttle pot and throttle angle change continuosly. Closed throttle is at 0,48V.

If you hover over the entries  you will get some hints what the normal is.

Attached Files

•  Einstellschraube.JPG   40.76K   4 downloads

Edited by genpop, 14 June 2020 - 08:38 AM.

[Dutchdave's25]

if you change the ECU, you might as well turn "the screw". because it is set for one specific ECU..