Fuel dump

[Shades_of_grey]

I will try to post a log tomorrow, but curious if anyone else is having or had this issue. Recently installed primary 200 cell high flow downpipes. Was throwing codes,but got non foulers installed and no more CELS. Now, in WOT, in 3rd, or even at 5th, once it shifts to those gears..it's almost as if the lpfp basket is running out of gas. It completely bogs, no power and it goes to map 0. I run E30 on Map 3 daily. Never had any issues before changing DP. Even went from a 1 step to a 2 step colder plugs gapped to .22. If I gradually increase throttle, no issues up to 175 (mexico). I also have EWG wires installed. In manual mode if I early shift (5200 ish, seems ok). For instance, today on the way home..doing about 65, floored it,kicked down a gear, shifted to 6th and then, felt like no fuel
.Just blah and went to map 0. Help?

 

[MetalMania80]

Post log with this issue. What happens then? Everything back to normal when you slow down or do you have to restart the car?

 

[Shades_of_grey]

Take a look at this wild log. It's not a 2nd to 4th pull, but a pull on the highway when it happened. You will see I am in Map 3, then switched to Map 4, WOT, then it threw me into Map 0. Normally when this happens, I just have to switch the the Map back to 3 and it's fine. Here's another thing. If I am using the paddles, and this happens, it will put me back to Map 0, but also put me in limp mode. I then have to restart the car.

@Terry@BMS Any thoughts on this?

 

[MetalMania80]

Last safety code 5- Fuel Trim Variance.

If it happened after your modifications, it has to be related to that.

Correct me if I'm wrong, but isn't the ECU tune needed after the installation?

 

[Thomby]

Working backward from the easy stuff: you have almost no timing corrections (ign1, ign2-6), your HPFP isn't crashing (fp_h steady at 10), and your fuel trims look ok (30s-40s). Pedal is 60-80 with throttle at 99 which seems odd, maybe pedal commander?

Where you drop from map 4 to 0, your fuel_en values hit 100. BMS says this is the O2 sensor offset to lean out AFR, but not what the values should be. Mine are usually 30-60, and I expect 100 means maxed out.

Trim2 is also 15-20 points higher than Trim, and it looks like 15 is enough for the JB4 to disable. Have you checked your fuel wires?

AFR: Air/fuel ratio bank1. Factory air/fuel ratio runs stoich 14.7:1 during lean spool mode and quickly drops down to 10:1 under sustained full throttle. The JB4 using FuelEn will lean out the AFR dynamically to a target of around 11.9:1. If AFR goes leaner than 14:1 at higher RPM the JB4 will disable.

Trim: Fuel trims in bank1. The JB4 has scaled fuel trims for quicker viewing, 25 in JB4 logs = 0%, 50 = +34%, and 0 = -34%. Generally fuel trims will jump up in to the 40s under peak torque and drop down towards 25 at higher RPM.

Trim2: Fuel trims in bank2. These will mirror Trim generally and if there is a deviation may indicate a fuel wire is loose or installed improperly. The JB4 will disable if Trim and Trim2 have more than a 15pt variation.

FuelEn: This represents the bank1 dynamic o2 sensor offset required to maintain a 11.9:1 AFR at full throttle. It’s managed by the JB4 internally using its dynamic double fuel control PID.

 

[Shades_of_grey]

hmm... I will check them again. It's funny that you mention the fuel wires. I was installing something (cant remember what, but it required me to disconnect them and I lost the bottom of the posi tap, but got some new ones the next day and redid them. Maybe the connection isn't good...because this all started happening right after that. If you just solved my issue...I owe you 1!

 

[Shades_of_grey]

I just rechecked the posi taps and everything was fine, even redid them to make sure I had solid connections. Guess it wouldn't hurt to disconnect the battery for a bit and see if that helps anything. Still waiting to hear back from Terry@BMS or their shop on the logs.

 

[G-10530]

Check your O2 sensors.

 

[MetalMania80]

Check your O2 sensors.

I'm wondering if it's possible for your o2 sensor to read differently and trims trying to adjust causing this trims discrepancy?

 

[Thomby]

Check your O2 sensors.

I'm wondering if it's possible for your o2 sensor to read differently and trims trying to adjust causing this trims discrepancy?

That's a good point. Maybe wrong wire tapped into, or sides are swapped. If I remember correctly, the wire lengths are different to account for distance from fuse box to passenger/driver side bank, but maybe they got mixed up.

@Shades_of_grey did you get the plug & play connectors, or tap into the stock harness?

 

[Shades_of_grey]

The fuel wires have not moved since I originally installed the jb4, years ago. Nothing switched. Yes I have the plug in plays with the posi taps. Definitely not tapped on wrong wire. Only thing I can think of is I had to use 45° non foulers on the down stream o2s because I was throwing CELS saying I didn't have a cat. These non foulers have a small little cat in them as well. No CELS since putting them on. Didn't figure I would need them being that my DPs have a high flow cat, but...here we are. I adjusted my WG parameters to 45 across the board as it seems like I'm overboosting, disconnected the battery, so I'll know more once I drive it later today.

 

[MetalMania80]

Do you have EWG connectors to your JB4? If so, disable them for a run and see what will happen.

It started to happen after your exhaust modification, so...

 

[Shades_of_grey]

Yes I have EWG, the problem was there before, hence why I got the ewg. Yes, everything started happening after the down pipes, but there has to be a solution. Tons of stingers run aftermarket DPs, catted and no cats and aren't seeing this issue. It's either I need the Bef 93 to be able to better rune the parameters or something. I shouldn't have to go back to stock dp to solve this. Theoretically, I shouldn't even need a BEF being that my primaries are catted.

 

[MetalMania80]

Safe code is not related to over-boost. WGDC stay low. The problem is with trims bank 1 and 2 difference. Try to inspect your O2 DP sensors and change them by site. Make a log. If trims reading change by site, you need a new sensor. If not, you need other spacers for your sensors.

 

[Shades_of_grey]

What do you mean by "site". Originally, with no foulers on, I was getting lean codes for both backs. I put a 45 degree on the passenger, no more cel for that bank, put a 90 degree on driver side and was still getting a cel. Changed it to a 45 and then the cel went away. I agree that something must be going on with the o2 sensors, but can't figure the shit out.. I have inspected them numerous times and all seems well. Thinking of pulling the spacers and see if now that the DPs have been on over a month, that maybe it would then now register me having a cat. Have heard about cat break in, but never believed it.. as you can imagine, it's just frustrating as he'll. I do appreciate your help!

 

[Thomby]

He's saying swap the O2 sensors themselves, in case there's an issue with one of them. Then we can look at Trim, Trim2, and FuelEn values again.

 

[MetalMania80]

"by site" left to right; right to left.

Your problem lies in different bank 1 and 2 trims settings. AFR is almost the same.
Trims are responsible for fuel flow, to meet desired AFR.

So, the problem may be in:
1. bad reading- O2 sensor malfunction.
2. fuel flow- injection system.

Your problems started after DP installation and O2 sensor repositioning. The best way is to take an OBD scanner and check your O2 sensors readings.

 

[Shades_of_grey]

Ahhhh...I gotcha. I am assuming it would be the downstream o2s, being that's what the original codes were. Those are a bitch to pull especially on the drivers side, and have to drop my secondaries just to get my hand in there for the plug. Definitely sounds like one is bad. Sounds like a weekend job once again.. fml. Appreciate it! Will keep you posted and get some new logs once switched.

 

[Shades_of_grey]

"by site" left to right; right to left.

Your problem lies in different bank 1 and 2 trims settings. AFR is almost the same.
Trims are responsible for fuel flow, to meet desired AFR.

So, the problem may be in:
1. bad reading- O2 sensor malfunction.
2. fuel flow- injection system.

Your problems started after DP installation and O2 sensor repositioning. The best way is to take an OBD scanner and check your O2 sensors readings.

But will do the scanner first to see what it's reading

 

[Shades_of_grey]

Ya'all are going to laugh your asses off at me, but this simple mistake has caused me countless hours of wasted time being under my car, cuts, bruises, stitches and so on, not to mention money trying to figure this out..I have almost spent everyday for over a month under this damn car trying to figure it out..removing exhaust, squeezing my hands in tight spots, contorting my body to get stupid o2 sensors out....all because...wait for it....

So as we all know..posi taps have a dull side where the fuel wire from the JB4 goes into, and then a sharp side that pierces the red wire (02)... well, apparently when i reinstalled this damn thing after the DP install, I had the posi tap reversed so the dull side was trying to make contact with the micro hole that the sharp side pierced.... What a complete dumbass... That's what happens when you work on a car for 8 hours installing DP and want to get in a hurry to drive it and you rush the little things.. FML.

Appreciate everyone's help. Gonna get some good runs later and will post some logs for you to check out!!