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ECMlink Car won’t stay at idle

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byAzon

Proven Member
43
3
Jul 27, 2019
Cheyenne, Wyoming
Mod list: DSMLink v3, 1220cc injectors, speed density (Mitsubishi style), after market fuel pressure regulator, gt35r turbo, tubular manifold, FMIC, Walbro 450 pump.

Got the car in pieces and finally put it all back together. I can get the car to fire up like normal and it will hold RPMs but every time it dips below 1k RPM it just stalls.

I did a boost leak test and everything fine no leaks. I got two good data logs that I’m gonna try to post. I also have all the correct setting for speed density. I’m getting a new ISC tomorrow and TPS is adjusted to .63 bolts and cable linkage is adjusted. The only way I can keep the car alive is to blimp the throttle if I try to hold the pedal it will stall out. Any ideas anything helps
 
^^^^^ This
Yep, then we can see whats goin on.
Global set correct?
Injector voltage offsets correct?
What are the afr's?
 
Here the log I have where it stayed alive the longest. I had to use a different computer and for some reason wont let me display more values.

I'm currently having my down pipe made I just need it to stay alive so I can get it out of my brothers garage
 

Attachments

  • long idle log.2019.11.20-01.elg
    85.8 KB · Views: 90
No Wideband sensor? Can't read AFR's without it.
I would unlock your MPD sensor so it can read.
I have my MAP sensor assigned to my Baro input, see my picture.
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Last edited:
Ok I see why its missing then. It is needed for tuning and seeing if you are rich or lean.
 
Ok I see why its missing then. It is needed for tuning and seeing if you are rich or lean.
I do plan on putting it in but the guy who’s making it says next week I will have it but the afr not reading shouldn’t stall the car out. I’ll be back at the car here in 20 minutes and I’ll try those settings in your picture and I’ll unlock my MPD
 
I don’t think that’s a laptop issue. Is the “capture” not highlighted?
I pretty sure I went to capture value and I added more but I couldn’t get like my Omni 4bar to pop up and others like I did on my other laptop
 
Tony, maybe his firmware isn't up to date? What do you think to help him out?

I know I have one DSM running on some old firmware and some options aren't available on that ECU (the 90 GSX), so I need to do a firmware upgrade myself. I couldn't see a lot of captureable values when I added displayable items. Thoughts?

Trying to get that sorted out before he gets his downpipe and wideband installed so we can actually see the fuel the motor is getting.
 
Tony, maybe his firmware isn't up to date? What do you think to help him out?

I know I have one DSM running on some old firmware and some options aren't available on that ECU (the 90 GSX), so I need to do a firmware upgrade myself. I couldn't see a lot of captureable values when I added displayable items. Thoughts?

Trying to get that sorted out before he gets his downpipe and wideband installed so we can actually see the fuel the motor is getting.
Everything should be updated and I forgot to mention it’s a 97 7 bolt and also I have a steady 40 psi on my fuel pressure regulator. It feels something more with air than fuel. And I can’t keep the car alive by steady holding the gas it will stall I have to keep blinking the throttle
 
Speed density cars are relatively easy to get started and running if you have all of the equipment installed.
My 21 yr old's project from me was to get my 92 up and running, since he helps me tune on the fly all the time. It took him about 15 mins and she fired right up.
I'm just saying that when you get all of the proper sensors needed for a good analysis, you will probably notice the problem yourself and be able to get her to idle and cruise. We play with global fuels until we get some reaction from the car then fine tune it for a +-5% in combined and short term fuel trims and they usually run great.
 
Tony, maybe his firmware isn't up to date??? What do you think to help him out? I know I have one DSM running on some old firmware and some options aren't available on that ECU (the 90 GSX), so I need to do a firmware upgrade myself. I couldn't see a lot of captureable values when I added displayable items.
Thoughts???
Trying to get that sorted out before he gets his downpipe and wideband installed so we can actually see the fuel the motor is getting.

The firmware version is on the lower right corner when you're connected. Latest one is from 2/2018 and you'll see the fuel prime under Misc tab. You have to add them from Captured values first, then you should see them in displayed values.
 
Everything should be updated and I forgot to mention it’s a 97 7 bolt and also I have a steady 40 psi on my fuel pressure regulator. It feels somthing more with air than fuel. And I can’t keep the car alive by steady holding the gas it will steal I have to keep blinking the throttle

Don't think this is your issue, but did you set the pressure with the vacuum hose off? Also, which 1200 injectors are you running?

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Don't think this is your issue, but did you set the pressure with the vacuum hose off? Also, which 1200 injectors are you running?

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I did set the fuel pressure with the vacuum off and my injectors are FIC 1220s.

I thought speed density kits were easy too but idk I’m the only one you know that’s not running GM MAP cause I have the Mitsubishi style so on top of the intake manifold for a stock look but I’m hoping it’s my ISC.
 
Still reviewing the log we have.
Your MPD sensor is reading a constant +5.8 hg.....it shouldn't read that. Should have vacuum on it or at zero but no positive pressure, but I don't use the MPD sensor, I run the Omni 4 or 5 bar, depending on which car we are talking about. Still looking at your log but need more info from the motor feedback
 
Still reviewing the log we have.
Your MPD sensor is reading a constant +5.8 hg.....it shouldn't read that. Should have vacuum on it or at zero but no positive pressure, but I don't use the MPD sensor, I run the Omni 4 or 5 bar, depending on which car we are talking about. Still looking at your log but need more info from the motor feedback
I’m heading home when I get the new ISC and I do have a Omni 4 bar. I bought the speed density bundle (mistu style). How would I fix the reading so it’s not reading positive? What other reading do you want so when I head to the car I can get a new log
 
When possible, log the world, we can weed out what we don't want to see. But if you don't log it, we can never use the data.
I would log STFT, Combined FT, Boost (MAP sensor), Wideband (when you get that installed), Timing, Airflow, Throttle Position, VE and speed. Horsepower and torque if you like.
I log all kinds of stuff then just display what I want to see.
I would bet if you installed the Omni sensor (GM style), the values would be logged correctly.
 
So I should switch to a GM style instead of the MDP style? Or is that in the ECU input tab? And I’ll log everything it lets me and I’ll to add more values
 
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