L32 won't start

[S10]

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

[Vaughan]

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?

[Adamw]

Also, what are you using for an ignition module or coil pack?

[S10]

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

[Adamw]

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.  

 

[S10]

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

[Adamw]

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.  

[S10]

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

[Vaughan]

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?

[Adamw]

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.  

[S10]

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. 

[Vaughan]

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.

[S10]

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

[Adamw]

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.   

[S10]

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.

 

[Adamw]

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)

[S10]

OK thanks a lot for your help.

Have a nice day.

Patrick