1G Idle drop / car dies / help identify my ECU

[Laence]

Hey everybody. If been a "read only" member for years. I was able to serve most of my problems, cause most of them were just asked 100 times before

This time not, unfortunately. I got a 92 1GB Talon with 92 harness and sensors. I though I got a 90 ecu with ecmlink, so I switched PIN 6 & 14.
I experienced some idle isues. Everytime I hit the throttle pedal and let it off, the rpms drop below 800 and the car stalls, sometimes it comes back to 850 but most times it dies. On my other dsm the rpms drop down the ~1100 and then slowly goes down to 850. My talon is just missing this "backup function". From my understanding it could be a faulty idle switch right? If I just do not hit the gas it idles flawless. That makes entering a parking lot oder coming to a stop realy ugly.

I opend up the ecu (pics attached). It seems to be rebuild...they killed all numbers on it, it just says 90 ecu on the case. But on the board you can see E331B989D. I researched it, and from what I got I think its a 91+ ECU. So my pins have to be swapped back right? I already did that and it doesnt seem to do anything. I'm realy frustrated right now cause I got out of ideas :-(

Any help appreciated!

PS: Sorry for my english, it hast been years ago that I learned it in school...guess my grammer or word decision isnt 100%

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[Brandon Mau]

You have to post a idle log for us to help you out. Are you running speed density? You may need to raise your maf sliders or raise the ve table if speed density. After I swapped to my Kelford 272 for HKS I had the same problem everything looked good on the laptop but kept stalling. Finally raised my VE and fixed the stalling issue. But we need a idle log to fully help you out.

 

[Laence]

Im on a 2G Maf, but will switch to SD later this summer. I never though about it it could be an tuning issue. I only did some few adjustments to run it stable. I came up with the problem after setting the base things like timing, biss screw, idle switch.
Its late in the evening here and the car is at my friends garage. I will catch up a idle log tomorrow after work and post it here.

 

[Brandon Mau]

Sounds good. I live in Italy same time as you.

 

[Laence]

Awesome day...a friend had a idea, how to check if the ecu is 90 or 91+. I simply logged idleswitch so I found out that it is a 90 ecu and I had to swap the pins. Even when its a 91+ pcb, the guys who rebuild it changed it, maybe therefore are the blue wires on the back.

I said that I read all newbe things 100 times. Lets just say english is not my main language and my brain was off when I was reading some thinks. In my log I saw that tps was off. I used the tps adjust function in link and thinks changed to a way better idle. I also unterstand now how to adjsut the throttle switch, mine reads 0-1% at itdle, but it should be at 10%.

I will readjust thinks in the end of the week. First the idle stop switch to 10% at idle, then tps to read 0.63V (mine reads 0,67V at idle). Then readjust biss (even when its 29-30 now, I guess it will change after my throttle will be 10% not 1%).

I dont know what to say, I read 100x times about this value, but just dont know where to start. Seams everythig will be good soon. I will post a log anyways after I adjusted my TB. Never though thinks could change so much with only a few %...

Thanks for your help! I will show up a log an the end of the week and will see what you say about it.

 

[steve]

That is a late model ECU that has been converted to work in a 90 car. I'd have to go look at one of my ECUs to be sure but I suspect the two blue wires on the bottom are to swap 6 and 14 and the board added to the top side with the long blue wire is a 90 tach adapter.