Lean Spike

[LNFnewb]

Recently have noticed very consistent lean spikes in my lambda. CMD Lambda will be at 1.00, and it'll be hitting 1.99...

Best guess would be a boost leak at this point, but if anyone else has any clues to what the deal is I would really appreciate it. Car's been running perfectly fine up until the other day. Checked all the couplers for my hot and cold side IC piping and everything's been tightened as a precaution. Recently installed 3 bar sensors, and I checked those also and they seem snug and in place.

Going to go double check that my intake hasn't come lose from the turbo inlet now.

[silverbullet08]

post up a actual log, It looks like DFCO to me lol. Your throttle % looks to be 0 when it occurs. If you post a log I can trace it and see what all is going on at that excact time.

[LNFnewb]

post up a actual log, It looks like DFCO to me lol. Your throttle % looks to be 0 when it occurs. If you post a log I can trace it and see what all is going on at that excact time.

Here you go. Attached my tune as well for reference.

The knock I'm getting I'm almost 100% sure is ghost knock. It started just before the lean spikes and I discovered that the piece that held my Injen IC Piping down to the manifold broke in half and it has some wiggle room in there. Ordered the ZZP IC piping because of it.

[Freakotec]

It's 100% dfco. No need for concern in the least.

[LNFnewb]

It's 100% dfco. No need for concern in the least.

how do I fix it? and how do you know it's DFCO?

[Freakotec]

You can get rid of dfco by going to Torque Management<General<ETC Limits<Tq Mgt Inj Disable and zeroing out the entire table, BUT I personally wouldn't recommend it. You won't harm anything by disabling DFCO BUT it definitely makes the car decel soooo much smoother, quieter, and gives you far better fuel economy.

and i know that you're in dfco judging by your vehicle speed, rpm, load and ETC position.

[LNFnewb]

You can get rid of dfco by going to Torque Management<General<ETC Limits<Tq Mgt Inj Disable and zeroing out the entire table, BUT I personally wouldn't recommend it. You won't harm anything by disabling DFCO BUT it definitely makes the car decel soooo much smoother, quieter, and gives you far better fuel economy.

and i know that you're in dfco judging by your vehicle speed, rpm, load and ETC position.

So I feel like a dumby... My car has always done this. I just have never noticed it until recently... haha I just looked back at some older logs and saw it. Not sure why it just now came to my attention though.

[Freakotec]

So I feel like a dumby... My car has always done this. I just have never noticed it until recently... haha I just looked back at some older logs and saw it. Not sure why it just now came to my attention though.

haha.. no biggie man. No need to feel like a dummy.

[silverbullet08]

You can get rid of dfco by going to Torque Management<General<ETC Limits<Tq Mgt Inj Disable and zeroing out the entire table, BUT I personally wouldn't recommend it. You won't harm anything by disabling DFCO BUT it definitely makes the car decel soooo much smoother, quieter, and gives you far better fuel economy.

and i know that you're in dfco judging by your vehicle speed, rpm, load and ETC position.

Not sure what you ment by this but DFCO will help you with fuel economy. Think about it, every time you let off the gas and are coasting in gear your pulling out almost all the fuel except the little bit the engine needs to stay running. With DFCO turned off you are running a 14.7 AFR all the way through the decel vs. the 29.2 AFR that the car "claims", could be leaner idk. Thats atleast a good 9% reduction in fuel consumption everytime you let off the gas and enter DFCO.

[silverbullet08]

Here you go. Attached my tune as well for reference.

The knock I'm getting I'm almost 100% sure is ghost knock. It started just before the lean spikes and I discovered that the piece that held my Injen IC Piping down to the manifold broke in half and it has some wiggle room in there. Ordered the ZZP IC piping because of it.

That is DFCO. You need some serious work with your MAF. That is most likely 90% of the reason your getting kr. These cars do funny things when the maf is off. I pulled up your tune and it looks like your in the middle of doing a Maf cal since your MAF caliberation table was all 1s. You can get it a lot closer with just the frequency table alone so work on that one for a little longer. It will also help with your idle . I data log all 4 cylinders for kr seperate so I can see if what kr im getting is actual and or repetitive on a cylinder at a certain rpm. Not sure if you are or not. It showed me you only had it on cylinder 4.

[Freakotec]

Not sure what you ment by this but DFCO will help you with fuel economy. Think about it, every time you let off the gas and are coasting in gear your pulling out almost all the fuel except the little bit the engine needs to stay running. With DFCO turned off you are running a 14.7 AFR all the way through the decel vs. the 29.2 AFR that the car "claims", could be leaner idk. Thats atleast a good 9% reduction in fuel consumption everytime you let off the gas and enter DFCO.

Lol.... I think you misunderstood what I was saying my man. Either that or I just completely suck at explaining things correctly (which is more likely the case here.. lol).

That's kinda why I was recommending against disabling dfco..

[LNFnewb]

That is DFCO. You need some serious work with your MAF. That is most likely 90% of the reason your getting kr. These cars do funny things when the maf is off. I pulled up your tune and it looks like your in the middle of doing a Maf cal since your MAF caliberation table was all 1s. You can get it a lot closer with just the frequency table alone so work on that one for a little longer. It will also help with your idle . I data log all 4 cylinders for kr seperate so I can see if what kr im getting is actual and or repetitive on a cylinder at a certain rpm. Not sure if you are or not. It showed me you only had it on cylinder 4.

Not really sure why it was telling you I only had it on Cylinder 4. I have it on all 4 cylinders, and I only get knock on #4. I rarely get it on #1, and I can't remember the last time I saw knock on cylinder #2 or #3. I haven't found any repetitiveness with Kr in any of my logs which has become pretty irritating. Made a log on my way to work this morning and had no knock at all...

[silverbullet08]

Lol.... I think you misunderstood what I was saying my man. Either that or I just completely suck at explaining things correctly (which is more likely the case here.. lol).

That's kinda why I was recommending against disabling dfco..

Lol gotya. Well at least my post cleared it up for any one else.

[LNFnewb]

Lol gotya. Well at least my post cleared it up for any one else.

I do appreciate the clarification. I wouldn't dream of killing DFCO to get rid of the lean spike. Just wasn't sure what the deal was until I used my noggin. lol

[|V3nom|]

You can get rid of dfco by going to Torque Management<General<ETC Limits<Tq Mgt Inj Disable and zeroing out the entire table, BUT I personally wouldn't recommend it. You won't harm anything by disabling DFCO BUT it definitely makes the car decel soooo much smoother, quieter, and gives you far better fuel economy.

and i know that you're in dfco judging by your vehicle speed, rpm, load and ETC position.

whats the purpose of disabling dfco?

[LNFnewb]

whats the purpose of disabling dfco?

I'm sure there is more to it, but one purpose would to have complete control over the fueling of the car. It's sole purpose from what I understand is to save fuel, and increase efficiency in that sense.

[cobaltssoverbooster]

With deco on it messes with the fuel trims and screws your tables.