non random stalling


P

peiserg

GT Owner
Aug 15, 2010
284
Phoenix, az
Just had 2 stall events.. both times appear to be related to low speed (under 15mph) neutral coasting, while turning the steering. Almost repeated itself a couple times more, and all events seem related to turning steering wheel at idle while coasting in.

Yeah, my gas cap is fine. No I dont have any codes. In fact i was driving home from passing emissions, which requires an OBD read.

So if i coast straight... no problem.... if i crank the wheel... problem...

now what?

BTW this is a pulley/tune car with half a tank of gas.
 
when my O2 sensors are bad this sometimes happens (considering I run C16 all the time I change my O2's often). Also your tuner might be able to adjust the tune to increase the idle and this might fix it (did this to mine as well).
 
If you have a SCT tuner then connect it to a laptop run livelink and log the idle control valve, STFT, and RPM. The ECU should compensate for load from the power steering pump logging will see if that is happening.
 
Who's tune? One suggestion is to swap the tune back to OEM and see if you can repeat the problem. (Don't go rompin' around on boost without the right tune but no harm/risk to run lower RPM tests such as one you have described.)
 
Seasonal Gas may be?
 
Seasonal Gas may be?
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Is that a nice term for Eggnog fart?
 
Do they smell like eggs?
 
thanks for the suggestions guys. I've got the Heffner tune. usually pretty flawless, though i've had this issue intermittently in the past year.. maybe 5 times including today? I don't beleive the SCT tune that accompanies the tuner box has a "stock" option.. but i will recheck.. IIRC, it has a 91/93/100 tune. Is there some way to go back to stock with that being the case?
 
peiserg said:
thanks for the suggestions guys. I've got the Heffner tune. usually pretty flawless, though i've had this issue intermittently in the past year.. maybe 5 times including today? I don't beleive the SCT tune that accompanies the tuner box has a "stock" option.. but i will recheck.. IIRC, it has a 91/93/100 tune. Is there some way to go back to stock with that being the case?
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The SCT tuner has the OEM tune held within it as a process of the initial custom tune being loaded.

Now is your gal a TT or ?

Contact me as I would be glad to help

All the best

Shadowman
 
As said, the stock tune is in swapped into your SCT when you upload the Heffner tune.

peiserg said:
BTW this is a pulley/tune car with half a tank of gas.
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Shadowman said:
The SCT tuner has the OEM tune held within it as a process of the initial custom tune being loaded.

Now is your gal a TT or ?
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So, I'd guess it's the "or ?" type, not a TT. With the "or ?" being the one with a pulley/tune. LOL
 
You know, this is the one problem I had with my GT stock, with a Hennessey tune, and even a couple times after I had it tuned by another Ford ECU expert. Also had the dealer try to diagnose it and even made him change the fuel filler pipe. It just sorta went away as I modded the crap out of the car but it always bugged me I never figured out what it was.


I think at one point, it even happened to me coasting without turning the wheel but it was initially and most often just like you described it.
 
Would the aforementioned bad O2 sensor trigger a CEL? I'd prefer to avoid changing out things if that is the case. i'm thinking of a whipple at some point, assuming business improves.. would that do anything to "fix" it? Yeah,yeah... dumb question i guess, since i haven't figured out what's causing it!
 
peiserg said:
Would the aforementioned bad O2 sensor trigger a CEL? I'd prefer to avoid changing out things if that is the case. i'm thinking of a whipple at some point, assuming business improves.. would that do anything to "fix" it? Yeah,yeah... dumb question i guess, since i haven't figured out what's causing it!
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probably.
 
kumar said:
You know, this is the one problem I had with my GT stock, with a Hennessey tune, and even a couple times after I had it tuned by another Ford ECU expert. Also had the dealer try to diagnose it and even made him change the fuel filler pipe. It just sorta went away as I modded the crap out of the car but it always bugged me I never figured out what it was.


I think at one point, it even happened to me coasting without turning the wheel but it was initially and most often just like you described it.
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mine pretty much was like this too. Pulley and tune it did it. Once to TT/SC I'm pretty sure it did it a couple times too. Mine only did it while in neutral, going straight and coming to a stop.
 
Sounds like that tune isn't optimal for street use. I would bet Torrie has a tune that will fix it right.
 
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Mine has done the same thing, "in nuetral going straight and coming to a stop and died" , has done it a couple of times but fired right back up and ran fine

Mullet said:
mine pretty much was like this too. Pulley and tune it did it. Once to TT/SC I'm pretty sure it did it a couple times too. Mine only did it while in neutral, going straight and coming to a stop.
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I have had this same sequence happen on other fords with manual trans. Its usually a slightly sticky idle air bypass valve. Usually more prone on cars that sit alot or over the winter. Varnish coat inside the valve. Easy to remove, clean and reinstall.
 
I think you have a lose connection on a wire harness or fuse somewhere. We have had similar issues that turned out to be such. Turning the steering wheel would not have anything to do with this if it were an 02 sensor, filler neck, etc. Check all fuse boxes, computer wire harnesses, etc.
 
This is an old thread, but in the last month I had a couple of similar stalls, both as I was coasting to a stop at a light, very low speed, warm conditions. My car is tuned pretty edgy so my sense was that a large envelope of hot follow-on air from the car's draft caught up to us and rolled into the car's intake and the mixture suddenly went really rich as a result and it stalled. No lights. Started right back up. Hmm.
 
fwiw i've had no problems since my custom tune was done for my whipple. IDK if it will recur, of course. I do drive it a lot. I've been putting about 5k per year on the car.
 
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