S10 Posted October 28, 2023 Report Share Posted October 28, 2023 Hi every body, I swapped my chevy S10 with a L32 buick 3.8L. The engine won't start. The ECU is an Atom. I don't know how to wire the injectors. I tryied INJ 1: cylinders 1-4 INJ 2: cylinders 6-3 INJ 3: cylinders 5-2 and INJ 1: cylinders 1-6 INJ 2: cylinders 3-2 INJ 3: cylinders 5-4 with no results. Ignition is wired IGN 1 cyl 1-4 IGN 2 cyl 6-3 IGN 3 cyl 5-2 Can someone help me ? Thanks Patrick Quote Link to comment Share on other sites More sharing options...
Vaughan Posted October 29, 2023 Report Share Posted October 29, 2023 I've got the firing order listed as 1-6-5-4-3-2, assuming this is correct then your ignition wiring is correct. This firing order I think doesn't work well for semi-sequential injection so probably best just to use it in multi-point group injection mode. Can you attach a copy of your tune and a PC Log of you trying to start it. I assume you've had a timing light on it and calibrated the ignition offset? Quote Link to comment Share on other sites More sharing options...
Adamw Posted October 30, 2023 Report Share Posted October 30, 2023 Also, what are you using for an ignition module or coil pack? Quote Link to comment Share on other sites More sharing options...
S10 Posted October 30, 2023 Author Report Share Posted October 30, 2023 Thanks for your answer Sorry for my bad english i'm writing from France. Ignition coils are from a Volkswagen Golf 4. Yesterday, I tried to wired the injectors like that: INJ 1= Cylinders 1,3,5 and INJ 2= Cylinders 2,4,6 . It seems a little better, but engine doesn't start. I send you the tune file and a screenshot of the start 3800 fuel 98.pclr Quote Link to comment Share on other sites More sharing options...
Adamw Posted October 30, 2023 Report Share Posted October 30, 2023 Your MAP sensor is reading wrong, it should show about 100Kpa when the engine isn't running. Try the settings in the pic below. Assuming it has stock injectors, your injector flow rate should be about 325cc/min. I would turn off all the advanced fuel stuff for now so you have factors involved which will make it easier to understand. Turn off the dual fuel table, IAT trim table, and 5D fuel table. Populate the charge temp table with the example values in the help file. Quote Link to comment Share on other sites More sharing options...
S10 Posted October 31, 2023 Author Report Share Posted October 31, 2023 Ok I ordered a new MAP sensor. Injectors are 441 cc/min. Is this wiring right ? :INJ 1= Cylinders 1,3,5 and INJ 2= Cylinders 2,4,6 I'll let you know when these change are made. Thanks a lot Quote Link to comment Share on other sites More sharing options...
Adamw Posted October 31, 2023 Report Share Posted October 31, 2023 You dont need a new MAP sensor, it just has the wrong calibration set. 3 hours ago, S10 said: Injectors are 441 cc/min. Please humour me and set them to 325cc. An engine will always start easier with too much fuel than too little. Your log suggests there is not enough fuel (some of this lack of fuel is because the MAP is at 60Kpa though). 3 hours ago, S10 said: Is this wiring right ? :INJ 1= Cylinders 1,3,5 and INJ 2= Cylinders 2,4,6 Injector wiring wont make any difference as it is batch fire. This wiring is fine. I would suggest you update the firmware too, you have 5.6.4 which is very old and one I am not familiar with. Quote Link to comment Share on other sites More sharing options...
S10 Posted November 1, 2023 Author Report Share Posted November 1, 2023 Hi, The engine don't want to start.I'm losing hope. There is fuel and ignition, the sparks plugs are wet. I tried to increase and decrease crank enrichment, increase and decrease ignition advance. no backfire. Firmwire is updated, MAP sensor calibrated. Injectors set to 325cc/mn and finally set to 441cc/mn. There is certainly a small detail that escapes to me. Is it possible for you to check the log file ? Maybe you will see something that I don't see. Thank you in advance for your help. 3800 fuel 98-2.pclr Quote Link to comment Share on other sites More sharing options...
Vaughan Posted November 1, 2023 Report Share Posted November 1, 2023 On 10/30/2023 at 11:01 AM, Vaughan said: I assume you've had a timing light on it and calibrated the ignition offset? Have you had a timing light on it to confirm it is sparking correctly while cranking and that the trigger offset is correct? Quote Link to comment Share on other sites More sharing options...
Adamw Posted November 1, 2023 Report Share Posted November 1, 2023 Can you also confirm that the coils are wired like this: Cyl 1 & 4 to ignition 1. Cyl 6 & 3 to Ign 2. Cyl 5 & 2 to Ign 3. And the crank sensor pin B(18X signal) is connected to trigger 1 and pin A(3X signal) is connected to trigger 2. Quote Link to comment Share on other sites More sharing options...
S10 Posted November 1, 2023 Author Report Share Posted November 1, 2023 Vaughan, there is no timing mark on the damper. Maybe I will need to make one. Adamw, yes ignition is wired like you say, and trigger too. Quote Link to comment Share on other sites More sharing options...
Vaughan Posted November 1, 2023 Report Share Posted November 1, 2023 11 minutes ago, S10 said: Vaughan, there is no timing mark on the damper. Maybe I will need to make one. Absolutely find top dead center with a dial gauge, make a mark and then confirm timing with a timing light. Quote Link to comment Share on other sites More sharing options...
S10 Posted November 1, 2023 Author Report Share Posted November 1, 2023 I checked the wiring of the trigger. A is trigger 2 and B is trigger 1. but there is spark when I crank Ok Vaughan, I will do it and let you know Quote Link to comment Share on other sites More sharing options...
Adamw Posted November 1, 2023 Report Share Posted November 1, 2023 1 hour ago, S10 said: I checked the wiring of the trigger. A is trigger 2 and B is trigger 1. Sorry, this is correct, I just edited my post as I had those swapped. Your log showed realistic RPM so that tells us trigger 1 is correct, but I know some of the later GM V6's also had a separate single-tooth cam sensor so I was really just trying to confirm that trig 2 was in fact connected to the crank sensor and not a cam sensor. Quote Link to comment Share on other sites More sharing options...
S10 Posted November 6, 2023 Author Report Share Posted November 6, 2023 Hi, The engine finaly start I marked the damper at top dead center and check with a timing light. Everything is wired correctly. The firing order should be: IGN 1=cyl 1-4, IGN 2=cyl 6-3, IGN 3= cyl 5-2. I don't know why but the firing order is offset, it's: IGN 3= cyl 1-4, IGN 1=cyl 6-3, IGN 2=cyl 5-2. Quote Link to comment Share on other sites More sharing options...
Adamw Posted November 6, 2023 Report Share Posted November 6, 2023 2 hours ago, S10 said: I don't know why but the firing order is offset, it's: IGN 3= cyl 1-4, IGN 1=cyl 6-3, IGN 2=cyl 5-2. This would be the same as adjusting the trigger offset by 120deg (or -120) Quote Link to comment Share on other sites More sharing options...
S10 Posted November 7, 2023 Author Report Share Posted November 7, 2023 OK thanks a lot for your help. Have a nice day. Patrick Quote Link to comment Share on other sites More sharing options...
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