On my 99. Is their any real gains. Is it safe with 140+k on the clock. Except for a header, its the only thing I haven't done yet. I do have a distributor. Thanks. Oh and I wanna do a safe advance. Not trying to blow her up.

 

The timing is not controlled by the distributor, but by the PCM. Moving it would not work.

 

ok. thank you.

 

Late models like his timing can be adjusted with tuning though correct?

 

Only way I know of to advance the timing is to modinfy the CPSs position.

 

you could always go internal and degree the cam.

 

True. But if I go that far I might as well buy a performance cam,lifters,timing set,and a water pump. But an option nonetheless. I guess ill just leave it be for now. I'm not ready to crack into the motor yet. Thanks guys.

 

Yes, Using an aftermarket power programmer will change timing advance, and fuel delivery parameters. I don't believe any of them allow you to change to your own values. you have to use their preset ones. Usually only a couple levels of tune.

 

Is a programmer really worth doin on a stock motor with just an exhaust system. It made a nice difference on my stang when I had it.

 

FWIW,

http://www.jpmagazine.com/techarticl...ies/index.html

 

I doubt you will see much difference messing with the timing or fuel on a stock engine............If you had ported heads, and different camshaft, then yes you probably would.

They work really nice on the stang, especially when you add headers, and a better exhaust.

 

you cannot adjust anything with the timing on the 4.0L engine. Period. End of story.

No reflash, no chips, no indexing, nothing. The PCM controls and adjusts all aspects of the spark and fuel timing using signals from the CPS and the CKPS, along with the other sensors.

 

Then the only option is to fool the PCM. So it has to be done mechanically degree the cam, put resistors in on certain sensors, get sensors that read differently.....

 

Ive heard of using the CPS to adjust timing, cutting slots in it so it can move over farther, etc.
Theres also rumor floating around t hat there is a "high altitude" CPS that is advanced.

 

good luck with that...

If you're doing it to match modifications like forced induction, an adjustable MAP sensor is the solution on these engines. Other than that if you engine is running like crap, fix the issue causing it.

The CPS functions using pulses, not variable resistance, so you can't modify it.

The lifters are hydraulic, not mechanical, so degreeing the cam will not do what you want.