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ECMlink 90 DSM just put on SD need help with log

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unchuchable

Probationary Member
15
6
Jun 2, 2024
Seymour, Indiana
I have a 90 GST that I've been having problems out of.

When originally put on SD, everything ran fine but then I changed the throttle body and seemed to have all kinds of hell out of her for the last 2 years. Well I think I found my culprit in the MAP sensor connector was shorting out.

Now I've got her moving under her own power but I don't wanna mess anything up again so hoping I can post a few logs and have somebody with some knowledge help me out.

As stated the car is a 90 GST and mods are of course SD, FP manifold, bored .20 over then ARP headstuds and new gasket, Walbro 255 pump, TRE 1000cc injectors, FMIC, 2.5 turbo back exhaust AEM wideband in front O2, stock 14b turbo for now.

I am going to post 2 logs. First one is cold start and you can see how my AFR starts good then slowly goes lean. Second one is at operating temperature, it's only about 30 seconds long because the car dies and won't start back up. My battery jumper died so I figured this was at least a start to see what I may need to do to the car or in DSMLink.

Thanks beforehand with any and all help, its greatly appreciated!
 

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It's reading 68, 67, 66 degrees.
Raw voltage on it is logging as 2.94v, 2.96v, 2.98v.
In your earlier log it read 66 degrees all the way through.
I don't know, your weather there was in the 60's. Maybe it's ok?
If it was messed up, wouldn't the raw voltage be 0v, or 5v, or 4.7v or something like that?
Before that log it goes between 66 and 302. Something is wrong with it.
 
Also if spending money on a fresh wideband is something I need to do then I can just unsure of what’s the best option.
Innovate MTX-L Plus a good choice for our platform?

According to ECMtuning, the wideband that works the best with ECMlink is the Innovate LC-2.
They don't say anything about the MTX-L series but my guess is they just haven't tried it yet.
There are people in here who have bought new LC-2 units with a gauge recently. Takes a little figuring out how to do that because, as I recall, the ECMtuning pages for it are not very up to date.
I found somebody in here a couple months ago who has been using one of the MTX-L models and he thought it was good.

Anyway here's the potential problem for us 1g guys. It's that when you use both a narrow band and a wideband, you will run the narrow band on the Front O2 input, then you put the wideband on the EGRtemp input. The 1g EGRtemp input is the worst input of anything on any DSM. So if your AEM wideband is working badly on the Front O2 input, it will be even worse on the EGRtemp input.

So to put a wideband on the 1g EGRtemp input, don't even start with an AEM wideband. It should probably be an Innovate, or some other brand, but not AEM.
 
So to put a wideband on the 1g EGRtemp input, don't even start with an AEM wideband. It should probably be an Innovate, or some other brand, but not AEM.
If you have a narrowband and a wideband, you can use the narrow band to check the accuracy of the wideband when you have the car running at around stoic (narrow band is cycling).
That's one of the beauties of having both types of O2 on the car.
But you can't use the narrow band to verify that the wideband is accurate at richer AFRs like you have at higher power in open loop. And that's where you really need a wideband. To tune the high power part of operation. So it still comes down to, you need to have a wideband that is proven generally accurate on our 1g ecus.
 
Ok the "log after vacuum fix". I see one (1) sample where it glitches to 302 degrees. RawGMIAT is 0.00 volts there. So it looks like it momentarily lost contact there. That's at 1.995 secs in the log.
Everywhere else in all 4 logs it looks ok to me.
He might have a crusty connector or something on that thing.
 
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