90 Fuel trim help.

[white92talontsi]

Fuel trim Waaay off.

Just got my 90 running with dsm link setup.

Logging my Lo fuel trim it shows 0. Doesn't this mean that the ECU is dumping fuel?

Would this be indicative of a Large Vaccum Leak? Car would be Actually lean but ECU would be dumping fuel to compensate? Car has no power/extremely sluggish(Dumping Fuel)?

Also with the Lo being at 0 would this cause the car to drop out of closed loop and default to open loop since the PCM can no longer compensate?

 

[Tyeler18]

Post a log.

 

[EvilTSi_97]

Fuel trim Waaay off.

Just got my 90 running with dsm link setup.

Logging my Lo fuel trim it shows 0. Doesn't this mean that the ECU is dumping fuel?

Would this be indicative of a Large Vaccum Leak? Car would be Actually lean but ECU would be dumping fuel to compensate? Car has no power/extremely sluggish(Dumping Fuel)?

Also with the Lo being at 0 would this cause the car to drop out of closed loop and default to open loop since the PCM can no longer compensate?

Having your fuel trims around zero is a good thing. However, we need more information to be able to help. The best thing to do would be to post up a log. For example, if it's idling rough, take a 10 second log of it idling and upload it here for us to look at. Make sure you log the proper values, though. I would strongly recommend going over to start [ECMTuning - wiki] and reading through that. There's a very good section on fuel trims, what they are and how they work. There is also a really good video showing an example of getting fuel trims in line on their website here: http://www.ecmtuning.com/demos/fueltrim.html

Once you've read around about fuel trims, watched the video and have a good idea of what everything is...post up a log so we can see what's going on. We can't help you if you can't help yourself.

 

[white92talontsi]

Having your fuel trims around zero is a good thing. However, we need more information to be able to help. The best thing to do would be to post up a log. For example, if it's idling rough, take a 10 second log of it idling and upload it here for us to look at. Make sure you log the proper values, though. I would strongly recommend going over to start [ECMTuning - wiki] and reading through that. There's a very good section on fuel trims, what they are and how they work. There is also a really good video showing an example of getting fuel trims in line on their website here: http://www.ecmtuning.com/demos/fueltrim.html

Once you've read around about fuel trims, watched the video and have a good idea of what everything is...post up a log so we can see what's going on. We can't help you if you can't help yourself.

This is on a 1g and fuel trims are backwards from a 2g from my understanding. You want 1g fuel trims as close to 100% as possible for the Lo and the Mid's

 

[EvilTSi_97]

This is on a 1g and fuel trims are backwards from a 2g from my understanding. You want 1g fuel trims as close to 100% as possible for the Lo and the Mid's

I don't know who told you that, but that is not correct. Have you read anything on the ECMLink Wiki? That's a really good place to start.

fueltrimupdatepoints [ECMTuning - wiki]

 

[white92talontsi]

I don't know who told you that, but that is not correct. Have you read anything on the ECMLink Wiki? That's a really good place to start.

fueltrimupdatepoints [ECMTuning - wiki]

Yes I have read over the Wiki a few times.

For a 1g you want your fuel trims as close to 100% as possible. Anything over 100% and the ECU is pulling fuel and anything under 100% and the ECU is adding fuel.

http://www.pocketlogger.com/?pid=1gtech_trims


Just think of 100% as Zero on a 2g

 

[EvilTSi_97]

Yes I have read over the Wiki a few times.

For a 1g you want your fuel trims as close to 100% as possible. Anything over 100% and the ECU is pulling fuel and anything under 100% and the ECU is adding fuel.

1G Fuel Trim Information


Just think of 100% as Zero on a 2g

Did you? I'm assuming this part right here just slipped your mind:

"The ECU will also watch what's going on with the short term fuel trim variable. If conditions are right and the short term variable has stayed positive or negative long enough, the ECU will move the long term STFT pattern into the long term variable (LTFT). This is called a learning mode. Let's say instead of swinging around 0%, STFT is swinging up and down around -5%. The ECU will eventually take note of this and move that -5% adjustment into the appropriate LTFT variable and then zero out the STFT variable. Since both are factored in, the end result will be the same but STFT should now swing around 0%."

I'm not going to debate with you about fuel trims and where they should be. I know where they should be and it's posted clearly on ECMLink's website. If you want anymore help, I would suggest posting up a log.

 

[white92talontsi]

Did you? I'm assuming this part right here just slipped your mind:

"The ECU will also watch what's going on with the short term fuel trim variable. If conditions are right and the short term variable has stayed positive or negative long enough, the ECU will move the long term STFT pattern into the long term variable (LTFT). This is called a learning mode. Let's say instead of swinging around 0%, STFT is swinging up and down around -5%. The ECU will eventually take note of this and move that -5% adjustment into the appropriate LTFT variable and then zero out the STFT variable. Since both are factored in, the end result will be the same but STFT should now swing around 0%."

I'm not going to debate with you about fuel trims and where they should be. I know where they should be and it's posted clearly on ECMLink's website. If you want anymore help, I would suggest posting up a log.

Everyone that I have talked too and everything that I am reading about a 1g is not as you describe. The only fuel trim that will be close to zero should be CombinedFT. Everything else you want as close to 100% as possible.


This is Directly from Full Throttle

Before you go driving to set the base knob, you may want to reset the ECU, especially if the car is a 1g. This will reset the fuel trims all to 100% (1g) or 0% (2g), and will simplify tuning.

Although I am not using a MAFT it is telling you that the FT on a 1g should be at 100%.

 

[EvilTSi_97]

Everyone that I have talked too and everything that I am reading about a 1g is not as you describe. The only fuel trim that will be close to zero should be CombinedFT. Everything else you want as close to 100% as possible.


This is Directly from Full Throttle



Although I am not using a MAFT it is telling you that the FT on a 1g should be at 100%.

I am going to be as nice about this as possible. I have posted all of the relevant information on how ECMLink works with fuel trims, where they should be at, etc. I'm not quite sure why you're still trying to debate this with me. Read this VERY carefully:

"The ECU will also watch what's going on with the short term fuel trim variable. If conditions are right and the short term variable has stayed positive or negative long enough, the ECU will move the long term STFT pattern into the long term variable (LTFT). This is called a learning mode. Let's say instead of swinging around 0%, STFT is swinging up and down around -5%. The ECU will eventually take note of this and move that -5% adjustment into the appropriate LTFT variable and then zero out the STFT variable. Since both are factored in, the end result will be the same but STFT should now swing around 0%. "

Do you think ECMLink is lying to you?

 

[white92talontsi]

I am going to be as nice about this as possible. I have posted all of the relevant information on how ECMLink works with fuel trims, where they should be at, etc. I'm not quite sure why you're still trying to debate this with me. Read this VERY carefully:

"The ECU will also watch what's going on with the short term fuel trim variable. If conditions are right and the short term variable has stayed positive or negative long enough, the ECU will move the long term STFT pattern into the long term variable (LTFT). This is called a learning mode. Let's say instead of swinging around 0%, STFT is swinging up and down around -5%. The ECU will eventually take note of this and move that -5% adjustment into the appropriate LTFT variable and then zero out the STFT variable. Since both are factored in, the end result will be the same but STFT should now swing around 0%. "

Do you think ECMLink is lying to you?

This has nothing to do with what my original question was.

Simple Question.

LO TRIM is at 0, should be close to 100%, This would mean that the ECU is pulling fuel correct?

Did not ask about long term or short term. I know how those function, I was not asking about them.

 

[Tyeler18]

Funny how when the information is placed in front of you, you choose to ignore it. They do NOT go to 100% on a 1g, it is at zero. I have 2 90's tuned on link.

 

[white92talontsi]

Funny how when the information is placed in front of you, you choose to ignore it. They do NOT go to 100% on a 1g, it is at zero. I have 2 90's tuned on link.

Then why in the hell is everything saying that on a 1g the trims should be close to 100%????


?????
Fuel Trims (Low, Med, High):

Range: 60 to 140% (91+ cars), 80 to 120% (90's)
Fuel Trims are correction factors applied to the base fuel map. When in closed loop mode, the O2 Sensor is used to adjust the trims based on the sensor's values. A trim above 100% indicates the ECU is adding fuel (a lean condition), and a trim below 100% indicates the ECU is taking away fuel (a rich condition) from the base fuel map. Fuel trims are not used in open loop mode.

Check out the tech article:

 

[92nolatist]

I know exactly what your talking about OP. When I had a MAFT and a pda datalogger, my fuel trims (on the logger) were supposed to be at or around 100%. It is completely different with dsmlink however; fuel trims should be at or around 0.

So your not wrong with where your coming from. But we do need more information about whats going on with your car. So please can you post up a log?

 

[white92talontsi]

I know exactly what your talking about OP. When I had a MAFT and a pda datalogger, my fuel trims (on the logger) were supposed to be at or around 100%. It is completely different with dsmlink however; fuel trims should be at or around 0.

So your not wrong with where your coming from. But we do need more information about whats going on with your car. So please can you post up a log?

Thank you!! That was all that someone had to say was that I was right but ECM Link reads them differently.

When I get to work tomorrow and get my Laptop I will take a 5 minute Idle log and post it.

 

[EvilTSi_97]

Thank you!! That was all that someone had to say was that I was right but ECM Link reads them differently.

When I get to work tomorrow and get my Laptop I will take a 5 minute Idle log and post it.

This was explained to you how ECMLink works and you still ignored it. I asked you for a log several times. Once it's up, we can figure out what's going on. Not trying to come off like an ass, but if you're asking for other people's help...you can't argue and say this is wrong or that's wrong...because if you already knew, why would you be asking in the first place? Just be humble, go with the flow, and follow what ECMLink has on their Wiki. I learned everything I know about ECMLink through that and learning from other knowledgeable members on here. Hope we can get your issues sorted out!

 

[compression]

i think ecmlink uses 0% as apposed to 100% , i also used safc maft and pocket logger and they were 100% was normal. 90s range was 80-120 and 91-94 was 60-140 (on a stock ecu)

it is the same exact concept i assume. most of these guys probably haven't used old school technology like some of us haha , lucky them.

 

[white92talontsi]

This was explained to you how ECMLink works and you still ignored it. I asked you for a log several times. Once it's up, we can figure out what's going on. Not trying to come off like an ass, but if you're asking for other people's help...you can't argue and say this is wrong or that's wrong...because if you already knew, why would you be asking in the first place? Just be humble, go with the flow, and follow what ECMLink has on their Wiki. I learned everything I know about ECMLink through that and learning from other knowledgeable members on here. Hope we can get your issues sorted out!

I did not ignore anything. If you would have said that "hey ECM Tuning" no longer uses 100% and now uses 0% I would have understood. I will post a log up tomorrow

i think ecmlink uses 0% as apposed to 100% , i also used safc maft and pocket logger and they were 100% was normal. 90s range was 80-120 and 91-94 was 60-140 (on a stock ecu)

it is the same exact concept i assume. most of these guys probably haven't used old school technology like some of us haha , lucky them.

Now I know, Thanks for the Info!

 

[EvilTSi_97]

I did not ignore anything. If you would have said that "hey ECM Tuning" no longer uses 100% and now uses 0% I would have understood. I will post a log up tomorrow




Now I know, Thanks for the Info!

That's the whole point. ECMLink has NEVER used 100% as a base fuel trim. That was explained to the in the first or second reply. Not only that, I provided you with links to their Wiki and a link to a fuel trims video, but you said you had already read them several times. You were referring to another technology, while your original post has ECMLink and how it's fuel trims work. My point is this: you posted up a problem about ECMLink and it was explained to you this is not how ECMLink works. I'm just wondering why the "Oh ok. This is different than the device I am using now. Cool." light bulb didn't go off in your head.

 

[white92talontsi]

That's the whole point. ECMLink has NEVER used 100% as a base fuel trim. That was explained to the in the first or second reply. Not only that, I provided you with links to their Wiki and a link to a fuel trims video, but you said you had already read them several times. You were referring to another technology, while your original post has ECMLink and how it's fuel trims work. My point is this: you posted up a problem about ECMLink and it was explained to you this is not how ECMLink works. I'm just wondering why the "Oh ok. This is different than the device I am using now. Cool." light bulb didn't go off in your head.

Well I am freaking sorry that I have never used Link before and did not know.

You could have been nice about it and said "hey DSM link changed that"