I'm experiencing dieseling with my E-Force and I'm looking for others who have this problem. I have located 2 other people with this issue. I'm looking for a solution.

The dieseling event is around 2 seconds. After the ignition is tapped off, the rpms dive down toward 0, at 1 second of "decay" the rpms jump back up. I'll try to attach a screen shot of the scan. The entire shutdown event takes 1.94 seconds

The initial install was uneventful until the hand held tuner, that came with the kit, was used. The ECM became a paperweight for quite a few days until it could be revived and get the car to run.

We have tuned the car with MANY Edelbrock tunes and 2 private tuner's using MANY EFILive programs. The car runs perfect. It has NO other issues except it doesn't want to stop.

We've re-flashed the stock OS into the ECM and then edited the appropriate tables to run the SC, still dieseled.

We've pulled the SC and replaced the intake gaskets, still dieseled.

We've replaced the full set of injectors, still dieseled.

We've disconnected the evap line from the firewall, still dieseled.

Attachment:

diesel01 vertical bar shows ignition turn off
diesel02 vertical bar shows lowest decay of rpm before diesel event
diesel03 shows highest rpm during diesel event
diesel04 shows 0 rpm and end of shutdown


I'm looking for others that are experiencing this issue to compare notes and hopefully find a common solution to the problem. So, you need to have a 2007 LS2 M6 with the E-Force SC and you are experiencing a dieseling condition at shut off.


Elmer

 

What kind of injectors are you using?? are you sure they are in good operating condition??

 

ZR1 injectors. 52 lb/hr

Both sets used were new in the box.

 

interesting, everything ive ever seen with these situations lead to malfunctioning injectors.

 

Yeah, I got wind of that too. I still have the original 8 sitting on the desk in front of me. I had such high hopes for that 2nd new set!

 

When you key off. Is power definately shutting down to the coils and injectors/ecu etc ?

 

Steck and I are working on it on HPT right now. It's because the TB is not staying closed through shutdown. Will have fix soon.

 

Nothing to do with you, but im drunk, I can remember that my old 79 bronco would with a 400 modified would over heat alot, and when id shut it down, it would diesel for 5 seconds or more after shutdown. I can remember one time it did a bit longer and scared the **** out of me.


Not funny in your case, but just thought id share

 

Oh I remember those days! Does the term Throttle Position Solenoid mean anything to you? That damn thing would push up on the throttle lever and set the idle at "key on" and when you turned off the car it would dive back down to get the throttle blades to slam shut in the carb to try and stop the dieseling monster on emission withdrawals!

 

Yeaaaaaaaaaaah! It this only on the one OS? (mine?)

OS is 12614676
Cal is 12597121

 

As i was reading this, With drink in hand, i was cracking up! LMAO! the good old days, lol.

I hope you get her worked out man, sorry i couldnt help more.

 

Nah it's not just you, SOME of the 06-07 Z06's do it, but only become apparent when throwing a big cam at it.

 

But, but, but... I am sooooo stock except for the gadget on top of the engine it's embarrassing!

Give me a tweak to a table or something that'll shut that TB and stop this madness!

Elmer

 

I can only give you a redneck fix BUT it's HPT logic, not EFI Live. You can zero out the lowest portion of the RAF table but it isn't a promising fix, it just makes it so much better.

 

Is that the accepted fix for this issue? Surely, toning down the symptom is good but can't the disease be cured?


Elmer

 

We haven't got it figured out yet because the problem is "the tachometer resolution in your car is too fast and the ECM reads directly off it. Well as soon as the tach reports zero the TPS opens back up to default. In truth though when the teach reports zero ideally the engine is still turning 150 RPM and ignition voltage is put back to it for startup. The engine starts until the ECM realizes the key is still off and then dies." it is hard to tell the TB what to do with the key off

 

Tried to pull back some air by:

Minimum Idle Flow table:
RPM
250 set @ all 0, dieseled
250 set @ all 0, 450 set @ all 0, dieseled
250 set @ all 0, 450 set @ all 0, 650 reduced 10% dieseled
250 set @ all 0, 450 set @ all 0, 650 reduced 20% dieseled.


It's starting to look hopeless on this.