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Unread 08-29-2009   #1 (permalink)
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Unhappy 2000 Mustang Shuts off if idling and give gas suddenly

I Started Having a problem with my 00 mustang v6 when i start the engine in the morning it always accelerates for a little bit but when its going back down (rpm's) to normal it shuts off or when im at a light and have to stop it also shuts off unless i save it by giving it gas quickly before it stalls and also i got a OBD II code indicating that cylinder 4 is misfiring but i already changed all sparks and wires and still have the same problem and it struggles to gain speed at low rpms PLEASE HELP!!!!!!!!
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Unread 08-30-2009   #2 (permalink)
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What did the spark plug look like that you took out of the #4 cylinder? I would check the injector out. Maybe it is dumping gas.......
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Unread 08-30-2009   #3 (permalink)
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Originally Posted by shinerstang View Post
What did the spark plug look like that you took out of the #4 cylinder? I would check the injector out. Maybe it is dumping gas.......
+1, check the injector.

if you have a tuner or a scanner that has live data capability, find FRP, (fuel rail pressure). it should read somewhere around 51-52 psi. if you shut the car off and fuel pressure starts dropping quickly right away, you have a fuel injector stuck open.
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Unread 09-06-2009   #4 (permalink)
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i think that the code for the misfire is gone because i replaced the sparks and wires but the stalling still there and i was also cleaning the intake filter and i found oil in it and it comes out of the intake tube im also getting a vaccum leak code (large one) i checked all the vaccum hoses around the engine and they all seem to be ok i also replaced the purge valve and canister but the code wont go away and still stalling! THANKS FOR ALL YOUR HELP!
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Unread 09-07-2009   #5 (permalink)
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Originally Posted by eea0016 View Post
i think that the code for the misfire is gone because i replaced the sparks and wires but the stalling still there and i was also cleaning the intake filter and i found oil in it and it comes out of the intake tube im also getting a vaccum leak code (large one) i checked all the vaccum hoses around the engine and they all seem to be ok i also replaced the purge valve and canister but the code wont go away and still stalling! THANKS FOR ALL YOUR HELP!
there is no "vacuum leak code". post the DTC number if you can.

i think if you read the code again it will say "evaporative emissions system leak detected, large leak". that is not a vacuum leak; evap leaks and vacuum leaks are completely different.

if you have a vacuum leak, your car would be running lean. check your LTFT (long term fuel trim) on both banks 1 and 2. you want that number to be close to 0; ideally no more than +/- 10%. if it says -xx% then the computer is cutting away fuel due to a rich condition on that bank. if it says +xx% then the computer is adding fuel on that bank due to a lean condition. 25% is the maximum amount the LTFT will adjust fuel trim in either direction, so if you see 25% your car is running very lean.

LTFT1 = bank 1
LTFT2 = bank 2

if you find that your car is running lean, check for vacuum leaks. with the engine running, spray intake/brake cleaner on all the intake connections after the MAF, and all vacuum lines and around the upper/lower intake manifold gaskets. if the engine revs up or the idle changes, you've found a leak. if you dont find a leak, clean your IAC and your MAF.

however, if it is an evap leak, you'll need to smoke test the system to find the leak.

why did you replace the canister? they typically only go bad once they start breaking down internally. you can remove the canister from the car and shake it. if you hear a bunch of loose stuff inside it, then it's breaking down. also, you can tip them on their side and black chunks will fall out of it if it's breaking down.
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