-JSPEC 90 TII Engine
-FMIC 2.5" piping
-3" Straight pipe
-Emissions removed
-MOP removed
-airpump removed
-PS, AC removed.
-Stock Turbo
-Stock 550cc Injectors
-Stock fuel rails
-Stock FPR
-Stock PD
-Haltech Sprint RE
-Ghetto comp test Hot 93 on all faces with schrader valve removed.
-Timing is dead on at 5* ATDC @ 850rpm
-Innovate LC-2 WB02 set to 5v on both outputs
-Stock CTS
-No AIT Sensor
-Running 91 Premix lucas semi-syn 2 stroke oil

Issue: Running super lean

Holds a idle. Braps nicely.

with no load and steady throttle applied, it leans out, sputters.

With load, seems like any throttle applied leans out and sputters.

-New walbro 255,
-New Stock Fuel filter,
-Glow shift FPG reading 40 to 45 psi.
-Rebuilt fuel injectors.
-Checked fuel coming in at fuel rail inlet. filled 16oz water bottle in 3-4 seconds.

-pulled fuel rails off and left injectors attached with fuel pressure. Jumped the FIs with 12v and G. All 4 injectors sprayed healthy streams of fuel.

-Triple checked wiring.
-Check injector resistance - all ~14.5 Ohms
-Checked fuel injector wire resistance - .2-.4 ohms for 12v and .1 for all 4 Gs


-stock coils working fine, verified with a timing light.

Seems like the longer i run the car, the worse the issue gets. Eventually the car leans out so much it wont idle and dies, and will not restart.

tried adjusting fuel maps, maxed them out, has no effect on AFR. Sits around 15:1+ no matter what.

ECU is wired per haltech quick start manual.

Injectors, Coils, Fuel pump, and ECU all have their own relays and fuses, with 8ga wire from the battery to the fuse box.

Just cleaned up all grounds per Aaron Cakes Proper grounding procedures.

Any other questions just let me know.

Attached is a Datalog i took yesterday.

Ive changed the datalog file extension to xml to let me upload it because of size. You will need to change the file extension back to .csv once you download it.

Edit: Engine is completely independent from the car, meaning no electrical issues from the car are causing this problem.

 

1. it sounds to me like you definitely have a fuel delivery issue.

what happens to the fuel pressure when this happens? i can't open the datalog to see if you're logging fuel pressure.

your post did not mention verification that the walbro 255 is actually good. have you tried swapping it with a KNOWN good pump on a car that boosts and delivers fuel correctly at high pressure?

i had a "good" walbro 255 fuel pump in my white FC that would only run at a certain (low) speed and the fuel pressure would drop and cause lean AFRs when the FPR saw the rise in boost pressure. mine was not run-time dependent, but still a regular ol' walbro 255. this issue actually caused me to blow several engines.


2. if the pump is pumping plenty after it warms up it could easily be your map. upload your haltech map. i'm most curious about the fuel correction maps (coolant, air temp, post-start, etc.) a multiple percentage lean-out in a IAT fuel correction map or coolant temp map could cause this (like was your coolant temp at thermostat temp when you did any idle/driving/etc. tuning?)



i will open the map and the datalog when i get home. (i really want that $20).

 

1. I've actually bought 2 walbro 255 s brand new, but have not tried a know working fuel pump on a car that boosts. I am not logging fuel pressure. But according to my glowshift digital gauge, it never drops Below 40 psi. I have a hard time trusting this gauge ever since it ran outta gas and was still reading 37psi.

2. Haven't checked if fuel pump is pumping when car warms up, but like I said, fuel pressure is steady. I believe I AT correction is disabled, cts is whatever the base map is set at as well as post start enrichment.

I'm driving home so I'll post my map when I get there.

Also forgot to mention that plugs are dry and black after running. I take them out every time I'm done trouble shooting and inspect them.

Edit. I'm using base sprint re map for s4, only changes I made are target afr to 12.5 and fuel base map. And whatever standard settings to get it started. (Trigger angle, tooth ofset, etc

Edit2: coolant temp on this run was cooler than usual around 136f.

With my fan on, the car usually runs around 176, and I've had the same issue

 

Lets see your map

 

Be home in hour and a half. Commuting

 

Map attached.

 

Data log from yesterday, drove the car.

change .xml file extension to .csv

 

injector resistance ? ....


are you using the low ohming injectors on the sprint which can only drive the hi ohming ones?

if your injectors have a central locating notch on the clip then they are 86-87 injectors and low ohms

as such your ecu will run them for a short time./ start to overheat and lose control and lean out and eventually shut down till cool

sounds a bit like your problem and something you should double check


else have found that when running a walbro then it pays to upgrade the earth from top of the inspection lid to the body
( and sometimes from pump to lid )

as this will cause erratic running and a pump overheat

 

Injectors are high impedance. 195500-2020 densos.

Also did ground tge fuel pump to the body.

 

What is telling the ECU air flow? Map sensor or MAF sensor? This is your problem.

Also if you don't have a AIT sensor what are you telling the ECU the temp is?

 

Internal map.

The ait correction is disabled.

Why do you think the map is the problem

 

I would check the reading it is actually getting in the ECU, I have seen this many times. Confirm that it is correct and not some off the wall number. I would also check to make sure you do not have any major vac leaks. You're leaning out, meaning you are getting little fuel and a lot of air. So the ECU thinks there is not a lot of air in the motor ( ie map is reading incorrect). From what I have read here it sounds like you have really looked at all your fuel system pretty closely so I don't see that being your issue.

It could also just be your base map, where did you get it?

 

base map from haltech section

 

Well if you can post a log I will be able to check it out tomorrow when I get back to my computer. Does sound like a very odd problem.

When you are adding fuel to the map are you adding to target area or full map?

 

I already posted 2 datalogs. I've maxed out a 7x7 area on the map with where the load is in the center and still lean

 

Another random thing.... What kind of TPS are you using? And are you seeing that input on the ECU?

 

Stock s5 tps full range one.

It's been calibrated and fully functional

 

Just covering all the bases here, what does the ECU say the running temp is? You did say it leans out more as it heats up. Maybe the temp correction is all messed up? Or it's getting a bogus temp reading

 

... check that your P1 and P2 wires to your primary injectors are not crossed over. (so P2 isnt on chamber P1 injector)

I did that and it would run (was wet walling very badly) and it you gave it any throttle would go super rich and die.

just a thought.

 

The highest correction for the CTS correction map is 10 percent I believe. I doubt 10 percent is enough to cause this issue.

 

I've checked that. I'll check again tho when I get home this afternoon

 

When I was first installing the ecu, I had my primary injectors hooked up on my secondaries and vice versa. That's why I'm pretty sure they're hooked up correctly now.

 

A couple of things, someone mentioned the injector connection wires could be in the wrong location, also, looking at your map i get the impression that you may need to properly set the Staged Injection Bar map, that map will cause a lot of problems if not set right, anything from the engine not reving past a certain load when the secondaries are supposed to kick on, or leanouts. As well as the injection angle split table.

The way the staging works on the current generation of Haltechs is a bit different as how it used to work.

Also, did you go over your Injector Dead Time table for your particular injectors, looks kinda low low to me.

Also, go over the transient throttle settings, the main pulsewidth table looks on the low end, but you have 1.2 on the delta deadband, and the trim set at 100%, on the old E8/E11 it did need to be 100, but now it needs to be 0.

Also, turn off DECEL CUT until you get everything sorted.

Finally if you want to try and get this sorted out i would be available to provide you with full remote session tech support, for a fee of course, contact me if you're interested. To me it looks mostly like it just needs proper tuning, and making absolutely sure all is right with the fuel system and injector connections.

 

Check injector wiring.

Set injector angle per drawing attached.


Trim set to 0'/, deceleration cut disabled.

Still the same.

Like I said, longer I run it, leaner it gets.

It will run fine, then all of the sudden run on 1 rotor it seems like. Gets all shakey.

My trailing coil is pretty warm.

My ecu is also pretty warm.

New data log coming soon

 

new map.

stupid forum has upload size limits. cant upload datalog.