weird start up

[tstang21]

so far the car is running good just input. whenever on a cold start up, the idle jumps pass 1500 rpms or so. im believing i might have to adjust my idle or or clean the IAC. any other suggestions would be great.

 

[Venom351R]

could be your idle, whats it settle down to once its warmed up?

 

[HISSIN50]

I agree with the above. If the idle is raised via the stop screw, the cold idle goes up too. Mine used to jump to 1500 upon start-up (for a few seconds). This allowed a hot idle of 850. The bleed screw was set 1.5 turns from seated.

Good luck.

 

[tstang21]

I agree with the above. If the idle is raised via the stop screw, the cold idle goes up too. Mine used to jump to 1500 upon start-up (for a few seconds). This allowed a hot idle of 850. The bleed screw was set 1.5 turns from seated.

Good luck.

it jumps to 1500 rpms and then settles at 850. it tends to move just up just a tad bit. it sounds like i have a cam in some sort. yet i do have the cats still on.
for example i have flowmasters 40 series catback and 1 of the guys i know says that they tend to have a "cammed sound". back to idle, im going check for any vaccum leaks. while im at, adjust the voltage on the tps.

i did however was fooling with the idle screw to fix the shutting down issue i had when downshifting. no more shut downs