Ok on my Fc runs great in the high rpms, but when i try to get it to idle the engine just dies out under 1200 rpms.. i have searched and searched for vac leaks and my engine has 93 psi compression.. so if you have any ideas please let me know


Thanx

Dustin

 

things to check

TPS
AFM
fule pump
fule filter
timing

im shure thers mor but i cant think of it now

 

Timing!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

 

Timing? Are you ported?

Are any of the belt driven accessories dragging you down?

Got BAC?

Actually sounds like a bad-*** vac leak. Is she hard to start?

 

s4 is your problem mine does the same thing. i just drive it.

 

so did mine until i did my timing (off about 5 degees or so)

 

how did you check for VAC leaks??? Your description of the problem screams vac leak.

 

Well i have Removed all emmisions, and vacuum tubing.. i have changed all gaskets and blocked everything that needs to be blocked... No ps, or ac. i have not yet checked the timing mabee i should..

 

o yeah, it starts a litttle hard

 

Well i checked the timing on mine but its kind hard when it wont idle . So are you saying that you adveance or decreased the timing about 5 degrees to get it to run right assman?

 

I would be money that you have a vac leak.. while the engine is running spray some "Starting Fluid" around the intake runners and vac lines that you have left.

If the RPM goes up at all then you have a vac leak

 

You guys need to learn some old-school tricks, lol...

If a timing light won't work for ya, get her idling as well as you can, and tweak on the CAS until she runs lumpy, then tweak the other way until she's acting up again, then tweak it to the middle of the two extremes. This makes a good starting point for further adjustments later, when you figure out what else is wrong. If she runs like crap no matter where you tweak the CAS, either the timing is so far off that you need to restab, or you have definite other issues to resolve first before you even mess with the timing again...Like vac leaks

 

Well yea that is obvious lol i meant when you are alone and no one can help you.

 

I'm likely in the same boat as you with this S4. I'll tamper with the timing tomorrow