2G Car shut down and now it runs bad

[ttravis88t]

So, the other day I was driving home from work and as I was hitting some pretty high boost the car simply shut off on me. When trying to turn it back on it would die after about 3 seconds of running. So my first thoughts were "oh shit I broke another mass airflow sensor" so I unplugged the MAF and it was enough to keep the car alive and I was able to limp it home. But yesterday, I swapped in a working MAF and the same thing was happening.

Though not as bad, the car ran poorly with it plugged in for about 2 minutes before it simply couldnt accelerate anymore and begun to shut off. ECMLink isnt showing any DTCs and the CEL isnt on. Ive posted a log with the run I just described. Up until about 200 seconds I had the MAF plugged in and it run as i described. After that, is with it unpluged so that i would actually be able to drive it home.

Any ideas? Also this may be related, but I was getting a code a few days ago about "excessive time to enter closed loop fuel control" and I know a bad thermostat or a bad o2 sensor can cause this, so I already replaced the thermostat but the code still popped up, so my thoughts were maybe that the o2 sensor is bad causing both of these problems? Even though its not throwing a code?

 

[AWD-Tony]

Needs a tune!... Desperately
Why do you have it locked in open loop and locked O2 voltages?
At one point during idle, injector duty dropped to zero.
What are you using your MDP input for?
You don't have a wideband?
What injectors?
Why are you using MAF clamp function?

Please log & display battery, isc position and wbfactor (after you install a wb)

 

[ttravis88t]

Needs a tune!... Desperately
Why do you have it locked in open loop and locked O2 voltages?
At one point during idle, injector duty dropped to zero.
What are you using your MDP input for?
You don't have a wideband?
What injectors?
Why are you using MAF clamp function?

I this is how it was set from when my DSM tuner guy worked on it a while ago. I don’t adjust anything I simply use it to look at the DTCs and trouble shoot. I shouldn’t need a tune as it ran great before this. I do have a wideband, it was running like 10AFR during all this. Injectors are EVO3 injectors 550cc I think. And it’s not locked in open loop just none of the requirements were met and the car wasn’t running long enough to go into closed. The rest of your questions I’m not sure about.

 

[AWD-Tony]

You should wire in the wb output. I am amazed it runs and idle well. Those injectors shouldn't need much adjustment to the MAF slider. MAF slider and fuel sliders contradict each other. I would seriously tune this from scratch...just my .02. Good luck

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[ttravis88t]

You should wire in the wb output. I am amazed it runs and idle well. Those injectors shouldn't need much adjustment to the MAF slider. MAF slider and fuel sliders contradict each other. I would seriously tune this from scratch...just my .02. Good luck

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Well maybe, but I’d only say that’s something to say when the car runs how it supposed to. It’s not , something isn’t right that’s why I posted this was so that someone who knows more than me might be able to see what that thing is. Wether the tune needs to be changed or not in the future is different from what I’m asking. Nothing was changed in ECM link from when it ran good to now, so I’m not sure

 

[pauleyman]

boost leak test that thing.

 

[ttravis88t]

boost leak test that thing.

Just did. Hooked up a modified rubber clamp of sorts to the cold side of turbo and fitted around my air compressor with a shit ton of electrical tape. Bumped it to 30PSI and I listened…. Nothing…. No boost leak. Anything other values i should put on ECM link to run a log with that would maybe help track this down? And to clarify, it was running good before this so i can’t possibly see it as a tuning issue. Something malfunctioned

Edit: I just noticed the front O2 sensor voltage remains constant. Isn’t it supposed to fluctuate? I even unplugged it and it remains at the 0.51v could this maybe have something to do with it?

 

[jdxnc]

I think you need to fire that tuner guy.

 

[ttravis88t]

I think you need to fire that tuner guy.

Yeah I don’t go to him anymore, I’m trying to figure it all out myself through these forums, but I mean the tune was good It ran great before whatever this is happened

 

[AWD-Tony]

As I mentioned, your O2 voltages are locked for some reason. That’s why it’s not moving. Think it’s the last tab on the left

Sorry if I came off like a douche. Didn’t mean to

 

[ttravis88t]

As I mentioned, your O2 voltages are locked for some reason. That’s why it’s not moving. Think it’s the last tab on the left

Sorry if I came off like a douche. Didn’t mean to

All good man you didn’t come off as a douche, all this shit is just really new to me so I’m figuring it out as I go.

So would this be something in ECMLink I would have to change like a setting? Or is this something with the actual sensor itself? Maybe the harness? I’ve already got a new one ordered so I’ll hook it up tomorrow and see if anything happens.

I feel like this isn’t the issue though honestly, because it doesn’t throw a code

 

[AWD-Tony]

Yes there are two settings that’s making the ecu ignore your O2 sensor.
1 it’s locked in open loop (in the screen shot above)
2 O2 voltage is also locked

How long have you had the car?

 

[92AWDHX40]

Your a really good source to help, him out he just needs to start from the top.

 

[ttravis88t]

Yes there are two settings that’s making the ecu ignore your O2 sensor.
1 it’s locked in open loop (in the screen shot above)
2 O2 voltage is also locked

How long have you had the car?

I’ve had it since March of last year. So basically the car hasn’t been using the O2 sensor at all? Just stuck in open loop ??? That’s pretty shitty . I assumed it was in open because something was keeping it from meeting the requirements to go into closed. How do I change this along with the O2 voltage?

Edit: after looking under “ECU inputs” I now see it, there is box labeled “Lock front O2 voltage” and it is checked. So the guy who tuned my car clearly did that why would he have? Was it just a way for him to be lazy and give me a half assed tune?

 

[jdxnc]

Yeah I don’t go to him anymore, I’m trying to figure it all out myself through these forums, but I mean the tune was good It ran great before whatever this is happened

I'd say it was more of running "good enough" for you not to notice how bad it was. Learning to do it yourself is always best though, lots of good resources out there, you'll get it if you keep at it.

 

[ttravis88t]

I'd say it was more of running "good enough" for you not to notice how bad it was. Learning to do it yourself is always best though, lots of good resources out there, you'll get it if you keep at it.

Yeah I could probably agree with you on that ! Any places in particular that are good to learn from that you have in mind? Once I figure out what’s causing my problems I’ll definitely look into fixing the tune myself

 

[AWD-Tony]

I’ve had it since March of last year. So basically the car hasn’t been using the O2 sensor at all? Just stuck in open loop ??? That’s pretty shitty . I assumed it was in open because something was keeping it from meeting the requirements to go into closed. How do I change this along with the O2 voltage?

Correct. Uncheck both those two boxes, lock in open loop and lock front O2. But this might not help your current issue.

Can you wire in the wideband, log what I mentioned previously and post a log?

 

[ttravis88t]

Can you wire in the wideband, log what I mentioned previously and post a log?

Wire in the wideband? What do you mean by this? I have a wideband gauge but it’s standalone it doesn’t display through the ecu

 

[AWD-Tony]

Wire in the wideband? What do you mean by this? I have a wideband gauge but it’s standalone it doesn’t display through the ecu

You wire in the output (wb) to one of the inputs (ecu) you’re not using so it can be logged.

widebandbasics [ECMTuning - wiki]

www.ecmtuning.com

You can see my WB in blue. Very important for tuning.

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[ttravis88t]

You wire in the output (wb) to one of the inputs (ecu) you’re not using so it can be logged.

widebandbasics [ECMTuning - wiki]

www.ecmtuning.com

You can see my WB in blue. Very important for tuning.

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Ok cool, I’ll definitely have to look up a few tutorials on how to do that, and I’ll try to get a log posted soon with O2 voltage and locked open loop boxes unchecked so that way maybe I can pinpoint my current problem a little easier.

It’s just weird because the car will stay on if the MAF is unplugged but dies with it plugged in, yet the MAF isn’t the issue! I’m pretty lost but it’s clearly sensor related since I’ve determined there is no boost leak.

Thank you for your help though! Glad to have someone try and assist my stupid ass through this !

 

[AWD-Tony]

We’ve all started at the beginning at one point so we know the struggles.

 

[ttravis88t]

We’ve all started at the beginning at one point so we know the struggles.

Haha for real! It’s ok though I don’t plan to sell this car so I have plenty of time to learn. My knowledge of cars so far is pretty limited to just replacing whatever OBDII tells me to . I’m excited to learn more though.

 

[AWD-Tony]

There’s a lot of basics you have to go over before actually tuning. You’ll find several write ups here. If you’re more visual, jafromobile on YT has a few videos going over all that. It’s titled tuning 101. Great videos! You’re on MAF so don’t worry about anything speed density related.

 

[92AWDHX40]

That jaffro is amazing and really smart, and funny watch the many videos.

 

[ttravis88t]

There’s a lot of basics you have to go over before actually tuning. You’ll find several write ups here. If you’re more visual, jafromobile on YT has a few videos going over all that. It’s titled tuning 101. Great videos! You’re on MAF so don’t worry about anything speed density related.

Yes I’m definitely more of a visual/ hands on guy so this definitely helps. I will be checking that out tonight, I’ve been trying to find a series of videos for a while so this definitely helps. Thank you!