GT stalling at idle in stop go traffic :( - Page 2 - Ford Mustang Forum
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post #16 of 23 (permalink) Old 03-08-2019 Thread Starter
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Originally Posted by Dalton2006GT View Post
I personally don't see anything wrong. However, I am betting it is your maf curve not being where it should be. If you were to do a wide open pull, with the car fully warmed up, let's say from 2nd to 3rd or 3rd the 4th and come to a stop, I would bet the car would die due to the maf curve not being where it should be. To fix this, you would need to send a data log to your tuner. I would recommend getting a tune from lund racing and data logging after you get a tune.

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Originally Posted by LiveReckless010 View Post
A screenshot at idle is only a drop in the ocean compared to everything that the PCM looks at. Would need a playable datalog (preferably when the car stalls) to really be able to tell whats going on. I agree with Dalton2006GT, the MAF table could be off OR you could have a similar issue as what I actually have currently going on with my Whippled 2011. Turbulence in the air intake that trips the MAF out after a hard pull. Is your filter element open or enlcosed? Mine is enclosed, using the fresh air feed thru the front bumper as the main way in. After a hard pull, Ill drop into neutral at about maybe 80-90, it'll idle for a bit then fall on her face, while the car is moving. Caught the stall on datalog and Lund wasnt too concerned about it, just attributed to turbulence in the intake tube around the MAF as the MAF is RIGHT behind the massive-ass filter for the Whipple setup.

However, I will say that my stalling issue BEFORE the whipple sounds VERY similar to what youre experiencing, and I was able to trigger it by doing a hard pull (2nd or 3rd gear 2500 to 6000rpm) but it would only stall after coming to a stop and trying to maintain idle, not like now where itll stall while im moving in neutral.

See if you can trigger a stall and catch it on a datalog. PM me for my email so you can send me the datalog that way and I can try to take a look at it.

hmm im not able to duplicate this. I have been pulling hard the past few hours and stopping abruptly and nothing weird happens.I have seen this happen before on my older 01 gt though i just dont think its the same thing. The MAF card and CAI are solid after inspection. like i said in the opening post i have had this vehicle for 5 months almost and its only given me issue in one extreme circumstance- of stop and go traffic. could be a correlation without causation though.If you still want to see the data logs il be happy to do that i just havent caught the stall yet. im going to try letting it idle for 30 minutes in my drive way tomorrow and see if that does something

side note its a shame i have to pay again to get a custom tune.I guess Diablo "doesnt do that". I'll keep this option in my back pocket once i get more evidence its the tune.

appreciate everyone feedback

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Alright bud, just let me know! Im no expert, but I know enough to be dangerous and to tell you at least where to start looking lol

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Did you check the KAPWR voltage?
Is it throwing any fault codes?
If not, it's probably the tune.
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post #19 of 23 (permalink) Old 03-18-2019 Thread Starter
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THanks guys. I have someone working on a custom tune now. I'll see what that does once he is done
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Just a thought. Make sure your o2 sensors are working properly.
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post #21 of 23 (permalink) Old 03-31-2019 Thread Starter
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I have been in touch with a tuner who has been working with me with a bit more granularity. He his suggesting perhaps a vacuum leak somewhere. I have searched the CAI up and down and cant find anything suspicious other then the attached interface. but its snug on there. Anyone have a rundown of other vacuum lines i can check for? im new to this engine bay

He said the fuel trims are off 30% and should be obvious. I hope thats so am i just being a dummy
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First, you should check to see if you didn't put your mass air flow sensor in backwards, the opening should be facing the filter. After you checked that, I would listen for hissing or vacuum leaks. If you have done a intake manifold swap, there could be a leak somewhere around it causing it to have unmetered air coming into the engine. Also, check under the throttle body where the coupler is to make sure you don't have a gap from the rubber coupler to the throttle body. Make sure you pushed your pcv connectors on tight, the one after the throttle body can be a little hard to snap on sometimes. Hope you find your problem.

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