car has problems at high RPM

[BlckCobra]

so my car was getting dynoed wendesday and at like 5,500 the hp just drops off... its never done that before... plus it turns off everytime i let off the gas... any ideas??

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[cyac5l8trfcar]

vaccume problem, maybe fuel pressure sensor on the rail acting up. Does it missfire?

 

[BlckCobra]

vaccume problem, maybe fuel pressure sensor on the rail acting up. Does it missfire?

no heres a video... of the dyno... and than a quick view of the chart drop off and a little drive....


http://www.filelodge.com/files/hdd9/220619/blckcobradynorun.wmv

 

[BlckCobra]

ttt help!!

 

[Ear Rak]

i'm goin with vacum problem too. very similar to my car when a vacum line wasnt plugged into the back of the throttle body (i know, i'm a noob, didnt see it) and it would rough idle and almost die out (never fully died though) but it did drop drastically like that and i had to keep it revved at 1k at lights just to stop it from dieing out.

 

[BlckCobra]

i'm goin with vacum problem too. very similar to my car when a vacum line wasnt plugged into the back of the throttle body (i know, i'm a noob, didnt see it) and it would rough idle and almost die out (never fully died though) but it did drop drastically like that and i had to keep it revved at 1k at lights just to stop it from dieing out.

thanks ill check that at like 8am and let you know... any more ideas are welcome... :biggthump

 

[blubyu]

Wow, good luck. When the car dies it looks like the lights are really dim when cranking. Not sure if it's related, but have you looked at your charging system / battery? Maybe mine does the same thing? I never paid attention.

 

[qwik01cobra]

Damm Nick my car does that same shit but doesnt die consistantly like that it only dies once in a while but the RPM's always drop to like 200 when I come to a stop. But it doesn' t drop like that after letting off the gas only when I come to a complete stop . I would have to say you have a vacuum leak or check you IAC. :headbang:

 

[qwik01cobra]

:headbang: By the way nice vid your car is so sick :alcoholic

 

[BlckCobra]

:headbang: By the way nice vid your car is so sick :alcoholic

hahah thanks!! to bad its messed up, i havent talked to the shop yet today... hopefully they'll get it running soon

 

[2k4gt]

A NICK I WAS HAVING KINDA THE SAME PROBLEM WITH MY CAR AND MY PLUGS WERE TO HOT AND THEY GOT FUCKED FROM THE HEAT AND IT DID THAT SHIT THATS JUST AN IDEA AND SOME TIMES WHEN I WOULD STOP IT WOULD ALSO DIE BUT WHEN I WOULD HIT ABOUT 5,000 IT WOULD JUST CUT AND EATHER DIE OR COME REALLY CLOSE TO IT THE RPM'S WOULD DROP LIKE CRAZY :burnout:

 

[BlckCobra]

they already checked all the plugs... so i dont think thats it... ... it doesnt die at high rpms, it drives like stock inless you push in the clutch, it will die... even at like 2,000 rpms... but if your just acceling and driving normal its fine..

 

[qwik01cobra]

My improperly gapped plugs made my car run like :fart:

 

[hj16]

vacuum leak?
dead idler?
MAF leak?

I have no idea...sounds weird

 

[BlckCobra]

vacuum leak?
dead idler?
MAF leak?

I have no idea...sounds weird

ya they changed out the idler air control, or whatever that part is... but that wasnt it... idk hopefully they'll figure it out today... :biggthump

 

[rdsnake]

it sounds like something stupid like a vacum leak...everything else would set off a MIL...check out the last thing you messed with..it usually endz up to be that....

 

[rdsnake]

it wouldn't be a MAF leak...you can unplug your maf even remove your maf and it will run rough but not die out....plus it will set off a MIL...usually on fords you can unplug almost ever sensor and the car will still stay running...thats way i say it has to be something non computer control...something dumb

 

[BlckCobra]

i love pizZA!!! :headbang:

 

[Dana]

As someone mentioned earlier, Did you check the fuel rail pressure sensor?
It may have blown out the diaphram. The symptoms sound similar.

Easy to check. Just pull the vacuum line off of it and check for fuel in the line. You may also smell fuel in the oil by checking the dipstick.

If you do smell gas in the oil, change the oil and the FRPS.

Dana

 

[03CobraRed]

My car used to do that with a bad superchips chip?