Last night driving my '99 cobra, i took off in first and brought it up to about 6700 rpm pretty drawn out. When i slowed down right away the engine hesitated, seemed to miss, and ran extremly rough. After goosing the throttle for about 20 seconds It stopped wanting to die and just idled horribly. I gave it gas and took it about a block or two to the local gas station, and the whole time it misfired quite a bit. When i stopped, it ran a little better but still much rougher than usual. I popped the hood to reveal a knocking/ticking sound. I originally thought it was a rocker or lifter, than realized it was coming from around the crank pulley area, not the heads area. I shut off the car and turned it back on and it still did it. Than i revved the engine to about 3500 to 4000 rpm and when it settled, the ticking/knocking stopped, the engine shook a tiny bit and than it miracously idled like normal. I've beat on the car before and it's never done that. After that i drove around all night with no problem at all. The only thing i can think of is if oil stopped circulating well under such a load or that the traction control system (which was on) messed with the timing or something. I'm really not sure and i just recently bought the car. Please try and help because i just bought this car and I hope it's not a serious problem. i've put about 500 miles on the car and numerous hole-shots without the least bit of problem. As far as i can tell this cobra is in superb mechanical condition, but that whole ordeal just got me thinkin. Please tell me if im just making a big deal out of a fluke.
Engine problems please help!!
- Thread starter Yournamehear119
- Start date
03ghoststang
Well-Known Member
03GTconv
New Member
Man u better hope u put your pulleys on right!! I F___ED up my 00 Gt cause of the underdrives. It did the same thing and in the end i ended up givin up my GT cause of the damage. U cant just bolt on underdrives bro theres a technique. I found out the hard way.
Well, I am not convinced it is for sure the pully install but here is more info:
14520
4.6L 4V Pulley Instructions
Some 1996-2001 Mustang owners, for engine performance purposes, are adding a special front drive pulley kit to reduce front accessory drive speeds. When removing and replacing the crank pulley, if the large bolt used to hold the crank pulley undertorqued, the keyway will shear and cause major engine damage. The resulting engine damage is not warrantable. If the crankshaft pulley bolt is removed it should be replaced as it is a torque to yield bolt. The installation of the crankshaft pulley requires that a specific torque operation be adhered to. The crankshaft pulley bolt must be installed using these 4 steps: 1) Torque to 75 lbs/ft 2) Back out one turn 3) torque to 45 lb?ft 4) continue to tighten and additional 90 degrees.
14520
4.6L 4V Pulley Instructions
Some 1996-2001 Mustang owners, for engine performance purposes, are adding a special front drive pulley kit to reduce front accessory drive speeds. When removing and replacing the crank pulley, if the large bolt used to hold the crank pulley undertorqued, the keyway will shear and cause major engine damage. The resulting engine damage is not warrantable. If the crankshaft pulley bolt is removed it should be replaced as it is a torque to yield bolt. The installation of the crankshaft pulley requires that a specific torque operation be adhered to. The crankshaft pulley bolt must be installed using these 4 steps: 1) Torque to 75 lbs/ft 2) Back out one turn 3) torque to 45 lb?ft 4) continue to tighten and additional 90 degrees.
03GTconv
New Member
I would man, take it and have it checked out. Im tellin ya those underdrives will mess ya up if not properly installed. The "FiX" is related to the 99 cobras. At launch they unfortunatly didnt meet up to the 320 BHP that they were rated at. So ford recalled them and had them fixed to the right Horsepower rating.
PonyboyIsaac
New Member
- Aug 20, 2004
- 79
- 1
- 0
umm all i can say is what the heck is up with people reving there engines so much, thats not good on these engines so expect problems if u rev the crap out of em.
never rev above 6100 on a stock modular(unless its an 03,04 cobra) is my rule.
never rev above 6100 on a stock modular(unless its an 03,04 cobra) is my rule.
the98stang
Active Member
Yournamehear119 said:
I'd get a compression test done and make sure she's holding enough pressure..
ok if i wa you i would have that underdrive crank pulley looked at.
some underdrive pulleys when they come loose will cause this exact problem. whats causing the idling rough and misfires when the pulley comes apart, the crank sensor NEEDS to see the crank pos. correctly or you will have misfires or even a no start.
i had a friends gt do this. he found his crank pulley fell apart and was loose.
some underdrive pulleys when they come loose will cause this exact problem. whats causing the idling rough and misfires when the pulley comes apart, the crank sensor NEEDS to see the crank pos. correctly or you will have misfires or even a no start.
i had a friends gt do this. he found his crank pulley fell apart and was loose.
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