Random stall with wrench light under vacum

[b00stedgt]

Took the mustang to work today after not driving it for a month and it threw a wrench light and stalled in third gear while crusing with no throttle. I was able to turn the ignition off and restart the car but could not pull any codes. I am thinking it may have been a random misfire possibly due to old gas. This has happened to me before but not very often. Does anyone have any ideas on what may cause this?
Mods are:
Whipple with 3.5" pulley
Hot Rod Cams
Long Tubes
Lund Tune

 

[stkjock]

were you coasting at the time?

a misfire generally would not cause a stall

 

[b00stedgt]

Yes I was coasting. That is what I don't understand, there was no load on the car. It could have happened before I started coasting but even at that, I was under very light throttle as I was going down hill.

 

[stkjock]

sounds like the dashpot setting in the tune


I had a similar issue, I would put the car in neutral and coast and the motor would stall.

 

[13726548]

Is the dashpot setting adjustable?

 

[stkjock]

Is the dashpot setting adjustable?

yes, but not on the handheld AFAIK, it must be done in the tune file.

 

[b00stedgt]

Did you get a wrench light?

 

[stkjock]

well when the motor stalls, the entire dash lights up.... but nothing stayed on after the motor re-fired

 

[b00stedgt]

I only show a wrench light until the rpms drop to 0

 

[GerRod]

Any updates on the problem?

I have the same mods and experienced the same thing after a year of being supercharged, trouble free. Replaced the TPS and thought I had it but it happened again. Ended up cleaning the MAF and replacing the throttle body. So far, it hasn't happened again.

 

[b00stedgt]

It happened again today. This time in fourth gear maintaining speed. Wrench light came on, car went into limp mode and then stalled out when i put it in neutral. Does this sound like a tune issue or mechanical?

 

[maliciouslogistics]

I had a very similar problem. I have a Saleen S-VI and a JDM tune on a SCTX2. I would just barely press the throttle (pedal or cruise control) and I would lose everything and get a wrench light. I ordered a new tune with a SCTX3 and haven't had the problem since.

 

[b00stedgt]

Who tuned it when you resolved the issue? Do you know what they changed? I emailed lund, so hopefully he has an idea on how to resolve it.

 

[07VistaChicago]

Clean throttle body very well, then consider the tune. When I say clean the throttle body, I mean take it off, and really get every bit of oil residue out! Have to do it basically with it off the car to make sure you get everywhere. I had the same problem.

 

[b00stedgt]

What did you clean it with? I have breathers so there really shouldn't be any oil in it

 

[Fuerte]

What did you clean it with? I have breathers so there really shouldn't be any oil in it

Throttle body cleaner. Same thing happened to me when I switched out my battery.

Sent from my SCH-I535 using Tapatalk 2

 

[ChiDiddy]

when i had my whipple, thsi would happen to me. On ther freeway sometimes when i let off the gas, and when pressing the gas again to gain some speed, no response and lighst will all come on and car shuts off.

 

[b00stedgt]

I am glad I am not the only one with this issue. I will try cleaning the throttle body today and report back.