Hey all this is a silly question..... Would logging show any problems with the engine? Like leaking injector(s) or a bad MAF?

Car is a MY98 gf8 ej20k.

 

yes of course and is a very useful tool in diagnosing problems. leaking injectors will affect your air fuel readings and your fuel trims and also your maf readings as well. regarding the maf try unpluging it and see what happens. if the engine ticks over smoother there could be a problem with the maf. you could try cleaning the maf sensor with carb/brake cleaner but do it carefully as the sensor is a thin piece of wire.

 

if your car has OBD access then yes . . .

 

Thanks guys, I have the ESL ecu and I haven't logged/tuned it yet. What parameters should I be logging to see what causes high idling(1100rpm)? For leaking injectors I just log the A/F?

 

are you saying you have fitted the esl but havent had it profesionally mapped?

 

I have the ESL but I haven't installed it yet. Andy said the map on it is the same as the stock map 7s map. I assume that its safe to drive with?

 

Version 4 sti?
I'm pretty sure that would be 75 not 7S
UK MY98 would be 8S

If you haven't installed the ESL are you just running standard ECU atm?

What problems are you having?

 

yes ver 4 STi, and yes it is 75 sorry just checked.

Yes running standard ECU, my car has hard starts during first startup in the morning, high idle when cold outside even after achieving operational temps. The high (1100rpm) idles happens randomly, if I shut off and restart the engine it will go back to 800rpm.

Idle doesn't fluctuate.

 

Why have you not installed the ESL ecu yet?
Have you checked for error codes?
Sounds like it could be a CTS fault?

Install the ECU/ESL and do some data logging so you can see what's happening

 

I was going to wait until I have all my exhaust mods done so I can get a tune. I may as well install it

I don't know anything about tuning so I doubt I'll be able to read the logs. What would I be looking for?

 

Yes I would install the ESL since you have it.
Have you read the manual?
Data logging is very simple and the ESL software is very user friendly

Also some very helpful members on here if you get stuck.

 

Awesome, yes I printed and read the manual few times. I know how to log, just not sure what to make of the info. I will install it after work, log and see if I can view it.

Thanks!

 

Cool.
You will get the hang of things when you start using it.
Don't log everything at once as this slows down the sample rate.
Example,if your working on boost log Load,TP,WGDC,Manifold pressure,rpm,vehicle speed.
Working on timing log Load,actual timing,IAM,Knock events,TP,speed,coolant temp,IAT(if you have one fitted)
By the way,I'm still in the learning stages myself so don't take my info/advice as gospel lol

If you've read the manual a couple of times then I would advise reading it a few more times,and refer back to it when you are working on different parts of the map.

Good luck mate,let us know how you get on

Ideally you will need detcans,Wideband AFR gauge,boost gauge at the minimum.

 

Hi what do you mean by CTS?


I installed the ESL ecu. To get an accurate reading, to I log doing wide open throttle pulls? or Just regular driving?

 

Coolant Temperature Sensor (which sends info to the ECU).

It does what it says on the tin.

 

You can tune idle and cruise more accurately if you switch off closed loop,this way you can line up your AFR with the wideband and get things a lot closer so closed loop isn't working as hard to make changes.
And WOT pulls to get your power runs tuned.

CTS is coolant temp sensor,you can log that data and will show if its faulty,but sounds like you're having fuel pump issues over on your other thread.

 

Awesome thanks!


yes sir I am I didn't want to go wide open throttle logs if not needed. I was hoping I could view some sort of data on the log if my pump is going. I'm at work so I can't check, but I am assuming no.

 

Unfortunately fuel pump duty and injector duty can't be logged on ESL.