I have been running into some pretty big problems with my stang here lately.
The worst issue so far is a hard cold start. When my car sits and cools down and I go to start it it wants to idle down to 500 RPM and eventually die. It acts this way for at least 3 minutes until it gets warmed up, then it will start up without a hitch and idle right down to 650 RPM. I can also repeatably start it once it is warm, its only on cold starts that it acts like a fool.
basicly i have tried replacing my Pro M meter with the stock one, switched to a different throttle body, replaced the EGR and both O2's because that turned up on a code scan, messed with the TPS to no end, turned the idle up and down, replaced every gasket in my intake tract from the lower on up, cleaned and greased my 10 pin harnesses, replaced the IAB, and turned my mass air sample tube every way possible and still no beans. I even did a leakdown and the engine passed with flying colors on all cylinders.
This problem just popped up about 2 weeks ago and has gotten progressively worse since then. When i first installed this cam it would start right up no problem! the car throws no codes or anything like that and it seems that if i try to drive it off when its in this state it will sometimes backfire and pop a little. it also seems that the throttle has no real bearing on it, if i give it gas it revs right up but sometimes will hesitate a little if i hold it at a set RPM below 3000 when it is having its fit. I have pulled the plugs and it fires so well that you cant even tell the plugs are getting used. All headers are hot so it is firing on all cylinders. the cam is a lunati grind.. .500/.510 lift. I also have a 75mm bullet calibrated for my cai and 19# injectors.
I just cant figure it out. Its either some sort of electronic issue, a fuel problem, or a spark problem. I have done everything i can think of to make sure its not an air problem. The fuel pressure stays set at a constant pressure durring all of this, it doesnt fluctuate or drop or anything like that. After 3 minutes or so the car smooths out and wil hold an idle just fine and runs great. as long as the temp in the block is still warm it will start right up every time.
I need some suggestions or im either going to swap back to the stock cam or rip the fuel injection clear off the car and go carb if i dont sell it first.. its driving me nuts.
The worst issue so far is a hard cold start. When my car sits and cools down and I go to start it it wants to idle down to 500 RPM and eventually die. It acts this way for at least 3 minutes until it gets warmed up, then it will start up without a hitch and idle right down to 650 RPM. I can also repeatably start it once it is warm, its only on cold starts that it acts like a fool.
basicly i have tried replacing my Pro M meter with the stock one, switched to a different throttle body, replaced the EGR and both O2's because that turned up on a code scan, messed with the TPS to no end, turned the idle up and down, replaced every gasket in my intake tract from the lower on up, cleaned and greased my 10 pin harnesses, replaced the IAB, and turned my mass air sample tube every way possible and still no beans. I even did a leakdown and the engine passed with flying colors on all cylinders.
This problem just popped up about 2 weeks ago and has gotten progressively worse since then. When i first installed this cam it would start right up no problem! the car throws no codes or anything like that and it seems that if i try to drive it off when its in this state it will sometimes backfire and pop a little. it also seems that the throttle has no real bearing on it, if i give it gas it revs right up but sometimes will hesitate a little if i hold it at a set RPM below 3000 when it is having its fit. I have pulled the plugs and it fires so well that you cant even tell the plugs are getting used. All headers are hot so it is firing on all cylinders. the cam is a lunati grind.. .500/.510 lift. I also have a 75mm bullet calibrated for my cai and 19# injectors.
I just cant figure it out. Its either some sort of electronic issue, a fuel problem, or a spark problem. I have done everything i can think of to make sure its not an air problem. The fuel pressure stays set at a constant pressure durring all of this, it doesnt fluctuate or drop or anything like that. After 3 minutes or so the car smooths out and wil hold an idle just fine and runs great. as long as the temp in the block is still warm it will start right up every time.
I need some suggestions or im either going to swap back to the stock cam or rip the fuel injection clear off the car and go carb if i dont sell it first.. its driving me nuts.