Ok so I just did a few things to the car and to start before the car was pulled apart start up was perfect with no issues what so ever with comp280s. The new mods done to the car as follows since it was taken apart

Bf272s
Buschur dual valve springs
Wisco hd. pistons
Eagle rods
New gaskets ect

Now when I try to start the car after it sits for 3-4 hours or sits over night the starting is horrible. I have to hold the gas, it mis-fires, and stumbbles for about a min or two then smooths out and runs good. Its a definate mis-fire related issue as when the car stumbles is goes rich when its not mis-firing its at around 11.0-11.4 on start up when it is mis-firing it falls down into the 10.0-10.4 range. Once the car has ran for about a min or two starting is not a issue. The car runs great other wise. The issue is not tune related, I have played with many things, switched back to maf and the problem is still there.

I dont know if it is something that these cams just "do" because there so big and pull only about -10 vacumn or what. Im not sure what way to go, I dont know if it could be someting stupid that im over looking or what.

Things I have tried so far
-New plugs
-Checking plug wires/coils visually, plug wires only have 2k on them and are oem.\
-Adjusted Maf comp vs. coolant temp
-Adjusted inital cranking ipw vs. coolant temp
-Adjusted desired iscv step in low coolant temp areas
-Adjusted Post cranking transiant enrichment vs. coolant temp

Ideas are appeciated.


Full setup on the car
Bf272s
Buschur dual valve springs
Wisco hd. pistons
Eagle rods
jm drag intake mani
ets t3 sc61 kit
delphi 1000cc injectors
255 hp pump
jm fmic with pipes
s.d. on 9653 rom
93 oct. gas

 

Stupid question but didn't see it. What fuel pump are you running.

 

Its karl, andrew Updated my first post btw.

 

Its been bitter cold out side in PA. My car has been taking a bit to crank over and throwing a mis fire code. So not sure what else it could be.. Sorry not much help

 

i have the same exact problem after gsc s2 cams. have to hold the gas for it to warm up a little otherwise it will stall

waiting for the weather to warm up a bit to get a new tune.

 

I had the same issue, make sure your cam angle sensor is pushed in all the way...mine was not and the motor would stall immediately after it would crank over.

 

might have to adjust the timming/fuel on the map. what do your logs look like? 272's and higher might need minor adjustments down low.

 

*PROBLEM SOLVED* well sort of. It appears to have been a bad fuel pressure regulator. After doing a compression test cold/hot it showed within 5psi cold/hot I moved on to other things. What I noticed is that my fuel trims were not -15% and on start up the car was very very rich for them few seconds that it would stumbble and make hard starting.

Today I went out and tapped on the regulator for a bit with a small hammer and bam, car started perfect and warmed up just as it did with the old cams. Now I just need to order a new regulator