djhedges Posted January 21 Report Share Posted January 21 First time wiring an ECU and I think we're getting close. It's finally cranking and making noises but not quite idling yet. I thought the header had a hole in it at first. I've tried a number of things Trigger offset of -84 or 276 (and played with ±10 degrees) With a timing light set to 0 the marks on the crank pulley lines up best at 6 degrees BTDC in the calibration settings I tried adding +10% fuel on cold start cranking table across the row (@ +20% there's backfires in the exaust) I pulled the spark the plugs and tested the pairs that are firing to ensure that they fire per the firing order 1, 5, 3, 6, 2, 4: IGN1 - Clyinders 1&6 IGN2 - Clyinders 2&5 IGN3 - Clyinders 3&4 If I crack the throttle a bit it idles roughly like in the video but on it's own Weeks ago I verified the injector wiring with a volt meter before installing the intake manifold Other things worth mentioning: ECT signal is from a linear 0-5v out from an AEM gauage which is reading ~10 degrees higher than the gauge itself. Although I did calibrate it against a chart from AEM. I assume this doesn't matter though. The motor has 276 cams, 11.75:1 compression and MS109 fuel Link 1.15 bar MAP sensor Link LSU 4.9 Tomorrow I plan to check if ever configured the idle stablizer valve. What else should I try? Trigger Scope - Waves.llgx Quote Link to comment Share on other sites More sharing options...
Adamw Posted January 21 Report Share Posted January 21 Attach the tune and a PC Log. Your trigger scope shows some teeth on the trigger wheel arte either damaged or magnetised or something, but Im not sure if that is the only problem without seeing a log. Quote Link to comment Share on other sites More sharing options...
djhedges Posted January 21 Author Report Share Posted January 21 I haven't touched any of the fueling parameters other than experimenting with some of the cold start settings. I did try lowering the trigger 1 arming threshold by 0.1 across the row and tried setting a target idle rpm of 1200 in this last attempt. PC Datalog - 2024-01-21 9;15;32 am.llgx Trigger Scope - 2024-01-21 9;16;05 am.llgx corrado_20240119_01_idle_rpm_1200_and_isv (1).pclx Quote Link to comment Share on other sites More sharing options...
Adamw Posted January 22 Report Share Posted January 22 In the log it looks like it is a lack of fuel, the RPM increases when inj PW increases and it appears happiest when the crank enrichment is dumping extra fuel in. Assuming it does actually have fuel pressure, then try adding about 50% to the current master fuel value. It looks like the trigger wheel is not causing any issues at this stage, but there is definitely something wrong with that wheel and will need to be fixed before the engine is run under load. Quote Link to comment Share on other sites More sharing options...
djhedges Posted January 23 Author Report Share Posted January 23 I tested fuel pressure before the fuel filter and before the fuel rail. It held >60 psi for 10 minutes after priming the pump in both locations. I also replaced the fuel filter while I'm here. I then tee'd the fuel pressure gauge inline with the fuel rail and watched it as it was cranking. It stayed in the 55-60 psi range. This was with an additional 50% fueling. I also logged the PDM this time. I'm dubious there's anything useful there. corrado_20240122_00_50_fuel.pclx PC Datalog - 2024-01-22 6;35;13 pm.llgx Trigger Scope - 2024-01-22 6;35;29 pm.llgx 20240122_00.pdmlog Quote Link to comment Share on other sites More sharing options...
djhedges Posted January 23 Author Report Share Posted January 23 I also pulled all the spark plugs last night and cranked the engine. With the timing light set to 10 it lines up with the TDC marks on the crank pulley. Quote Link to comment Share on other sites More sharing options...
Adamw Posted January 23 Report Share Posted January 23 I dont see anything obvious now. I would try a spray of starter fluid to quickly rule out fuel related possibilities. I notice you have an ignitor on the firewall - what is the ignition coil off? Does it have 4 pins? Quote Link to comment Share on other sites More sharing options...
djhedges Posted January 23 Author Report Share Posted January 23 ICM 0227100209 https://www.autohausaz.com/pn/4A0905351A (Although the picture looks different but it has 7 pins) Coil 0221503002 https://www.autohausaz.com/pn/00098 Crank Sensor 0261210107 https://www.autohausaz.com/pn/0261210107 Quote Link to comment Share on other sites More sharing options...
djhedges Posted January 24 Author Report Share Posted January 24 I got it to idle on it's own by cranking with the throttle open a bit for a minute or so. I think the header is either cracked or has a hole in it. I've not run these headers before. I did try a number of things before starting it. Ran a seperate shielded wire for the trigger signal to the ECU, swapped crank position sensors with an older one and I swap out the spark plugs. I didn't snag any logs unfortunately and the trigger scope looks the same. My next steps are to swap the headers and figure out why the killswitch didn't work. I apologize for the music in the background. I couldn't hear it over the exhaust. Quote Link to comment Share on other sites More sharing options...
Adamw Posted January 24 Report Share Posted January 24 Sweet, good work. It looks like you are going to have to replace the crank wheel now. Quote Link to comment Share on other sites More sharing options...
djhedges Posted March 27 Author Report Share Posted March 27 A bit of a follow up. You were correct in that the trigger wheel was bent. After swapping it we now see a better trigger scope and zero error counts. Quote Link to comment Share on other sites More sharing options...
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