04 cobra stalls out

MustangChris

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Heya everyone.


As you know, I dropped a 2004 cobra engine into my 96 GT.


It runs great, and it doesnt give me any problems, but last sunday I took it out and it stalled after a bout of "spirited driving" .... through 3rd and 4th gear I pushed it pretty hard to finally start to see what it can do (now that it's been tuned and the clutch has some miles on it.)


After taking my foot out of it, and putting it into 5th, the car would stall out on me.


. .... fast forward to today and I'm driving home from work and I push it in 5th. I only go roughly a city block or so simply to test the car to see if re-creating the problem is possible. Which it is.


After going WOT, the car dropped oil PSI to about 10 PSI so I pulled over and killed the engine. It would restart, but then stall. I opened the throttle a slight bit and it started just fine. drove it home with no issues.


The exhaust does have a slight backfire, which seems kind of random... (does it when its hot, cold, cruising on the highway, at a stop light....) ..


Let me know what you guys think!










car specs:
*2004 cobra engine - late build, 9 thread heads.
*2004 cobra computer system from headlight to tail light.
*dyno tuned, list of modifications a mile long, but major ones include fuel, ported/pullied blower, and bolt ons.
 

1997gtRioRed

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i would say take it back to your tuner, but im guessing you want the car back before next spring.......
 

1997gtRioRed

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my car kinda did that when i had a massive vacuum leak. ran great during normal driving, but it wouldnt idle. not sure if its the same for blown enignes though
 

white95

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Man, take it back to the tuner! The back firing sounds like a timing issue to my non-modular edumacated mind.. However, my archaic, dinosaur motors do that when the timing is off or the fuels octane is too low for advanced timing. Hope it's something simple Chris.
 
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MustangChris

MustangChris

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well its on e85. so that makes me feel better. lol.

Also, I'll get it on the jack stands and poke around for a little while before i take it back to the tuner. it was a 9 week wait-list last time.
 

Mystic SVT

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Sounds like you could have a vaccuum leak somewhere, could also be an issue with the tune.
 

ram360

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put a gauge on it an see what kind of vacuum your pulling at idle.
 

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