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With G4X ECUs on the latest firmware (comes with the G5 PCLink install) you can reallocate which ignition and injection drive is used for what so if you can use any of the Ign 5-8 pins on the expansion header as your additional ignition outputs as long as you reallocate them correctly in the Ignition Reallocation table. Example below uses Ignition 1 output for cyl 1 coil, Ignition 2 output for cylinder 2 coil, ignition 5 output for cyl 3 coil and ignition 6 output for cyl 4 coil.

It will most likely be to do with the speed lockout on your idle control. when rolling in neutral above the speed lockout the Idle position will be based on the base position table and offsets but when you stop rolling and drop below the idle speed lockout the closed loop idle will kick in and reduce the idle position to bring the engine speed down. Take a PC Log of it revving high while rolling in neutral and then coming back under control when stopping and attach it and a copy of your tune here.

Well yes, that was a theory a couple of days ago but now seeing that fuel pressure drops without any boost reference attached makes me think again. I need to think it all over. Been a long day juggling work, family and car bits!

All this seems to be leading to the manifold pressure reference going to the FPR is not really manifold pressure (i.e. it's restricted, leaking under boost, or similar). Or the Fuel Pressure Regulator isn't plumbed correctly, or has a leak itself.

Spent some time today changing out the last two fuel hoses to the hat from the hard lines under the car and then putting the the cam belt cover on. This has cleaned up the RPM a fair bit. These logs are with no filtering applied. The CAS definitely likes those rubber gaskets for vibration it seems! I thought I'd do a test with boost reference removed from FPR and set to 400 kpa. Still dips by nearly 60 kpa. With no reference shouldn't the FPR keep the same pressure it's set to? This is it set back to normal 300kpa and boost reference back on. [url=https://ibb.co/80HsSK0][img]https://i.ibb.co/xDNLRCD/image.png[/img][/url]

Hi, I've done a search but can't find anything similar and hoping someone can help. I have an R32 GTR with Link G4X. When coasting to a set of lights in neutral, the car will rev to 1500-2000 but as soon as I stop moving, it idles properly at just under 1k. The car was set up by a mechanic in Aberdeen, who now says he hasn't got time to look at it. Has anybody come across this previously? I'm fairly sure it's a setting in the ECU causing it. Someone suggested maybe the car thinks it's an auto, and so is revving as it slows. Is that plausible? Really appreciate any guidance anybody could offer.

GReddy so should be quite decent.

Im not sure if this is your only problem but it appears there is something wrong with your MAP sensor or its plumbing - it takes nearly 3 seconds after the engine stops to return to atmospheric pressure. Prior to that it looked like it was giving normalish response. Perhaps a kink in the hose or its full of oil or delaminating?

Thank you Adam.

There is no temp 4 on that ecu. The manual is correct, temp 3 is available on both the header and expansion.

You have it set to log only above 2000RPM, so in your top pic the logging is starting and stopping constantly as the RPM is constantly bouncing above and below 2000RPM. It appears you changed that setting for the 2nd picture as it starts logging from about 1200RPM in that one.

Would need to see the log and the tune. Does injector PW vary when the lambda varies? Is fuel pressure stable? Perhaps over-run fuel cut or another trim is active...

It is not possible with that ECU, there is extra hardware attached to Ign 4 to control the main relay etc.

Hi everyone, Working on an Evo 1, I would like to setup direct fire on the ignition side. I saw that pin 33 is label ignition 3 and fuel solenoid, and pin 38 is label ignition 4 and ecu hold power. Can I attach 3 & 4 coil to the respective pinouts and fire up or are there changes that need to be made in the ecu software as well? Thanks

Sorry gave you the wrong info about the ignition timing, had a brain fart. It was the lambda that was stable as this was the problem we were chasing originally. For some reason the lambda was above 1.4 and should have been below 0.9 So to overcome that I tweaked the fuel table to drop the lambda at idle. But as I have been testing I have been checking the exhaust pipe temperatures and one cylinder is quite cold compared to the others I have checked the injectors are working properly, by cleaning and testing the flow, I have checked that cylinder has spark. I believe everything is mechanically sound .

These are the logging setting I ran a test this afternoon and the first test still had this issue. I did another test, and it cleared it self It's a bit confusing

My WRX6X has AN Temp 4 stuck on 5V. There is some confusion in the drawings as the quick start says Temp 3 is pin B136-19, but also says T3 is on the expansion loom. Ive used the expansion T3 for oil temp and get a change in readings when i plug/unplug so i'm presuming that the onboard Temp is actally Temp 4. B136-19 has no wire in the plug from factory, so i added one in. Even with my new wiring connected or not, I still get 5V on Temp 4. Any ideas?

Thanks again @Vaughan

When running the lambda is sitting at around 0.875-0.925. To verify the O2 sensor, I had a spare so I put that on and no change. I have a copy of the tune and log with the ignition sitting stable at 30 degree, I can send you these later, I'm In western Australia so about 5hrs behind you in time.

Do you have a log and a copy of your tune with a point where it should be 30degrees and is not? Is the 30degrees that you are checking based on what the software says or based on a timing light? Lambda reading above 6 while it is running implies that there is an exhaust leak or a miss as that is very lean, what lambda sensor are you using, how is it connected to the ECU and if the lambda controller has a gauge does that show a different reading to the ECU when the ECU is seeing a lambda of 6?

The ignition angle should be 30 degree. I lambda will read above 6.00 when should be 0.900 approx and if i do a second test without changing anything the readings will be different

This is highly likely to be your ECU Logging settings with the condition for the logging constantly switching on and off. What do you mean by this

Looking at your log again and there appears to be some big bumps in the amount of fuel going in just before it dies which appear to be coming from the accel fuel putting in an extra 4ms of fuel which is about 5 times what it's putting in to keep it idling so maybe have a look at your tune and log to see why it is adding so much extra fuel in through the accel enrichment at that point in time.

I'll double check when I get home, although my setting have changed and previously I haven't had this issue.

I think I have a corrupt processor on the G4X, as you can see in the log It starts and stops the record constantly. I have posted another question on the forum page about this with an attached logged file. I have been getting a lot of abnormal reading after so a tests without doing any changes to the ECU.