won't idle on its own

[noah89t]

i have been searching for a while and trying to figure out this problem for a couple weeks now.
i installed an emanage a while back and found out it didn't work, so i removed it. then the car started idling like shit and threw the "no rpm signal code", and of course "over boost". Well i just checked my codes and there are none, but i have to keep the car idling with the pedal, and the car has a severe miss at idle, when i drive, it seems to go away. i let my friend thomas adjust the cps while i held it at 800rpm. it was right to begin with but he played with it a little, hopefully he got it back where it was. the cps is the only thing i haven't changed, only cause i don't have a spare. my fuel pressure was and is still set according to the tsrm.
things i've changed to identify the miss and rough idle: not in this order
ecu
plugs
wires
coilpack
igniter pack
isc
fuel rail
went from 550's back to 440's
went from lexus back to stock


adjusted tps a few months ago

I know it is a pita to diagnose problems without being near the car, but i could use some help.

 

[MDCmotorsports]

Check static timing on the cams and CPS (with fault jumper wire installed) Noah.

Also, do a boost leak check just for shits & giggles.

Hows the wires on your water temp sensors?

 

[noah89t]

wires are fine, i also changed the water temp sensor after chicago.
i will try to find a good cps to try, wonder how much they are new, if they can still be bought

 

[87M-GTE]

mine did that also, It made code 31. (afm) and I still have the stock afm. maybe check that. was it doing that with the lex afm or stock?

 

[noah89t]

it started idling like crap while all the upgrades were on. but i never saw that code.

 

[noah89t]

just got done changing the cps, and the car started up, but, i can't check the timing since it won't idle on its own and i don't have anyone local to help me at the moment.

 

[MDCmotorsports]

Make sure Noah that you have the diagnostic jumper installed when trying to check timing.

 

[noah89t]

i know john but thanks for looking out for me bro.

 

[ForcedTorque]

Noah, my Buddy Bill in Theodore (maybe 20-25 miles from you) helped me with my timing last weekend, and we adjusted my idle as well. I'm sure he would be more than happy to help. If I remember correctly, we rigged your water temp wires just before that Chicago return trip got interesting. Did you ever get a good pigtail for that? I'm trying to source good pigtails myself right now, and I think Ken in Texas has me hooked up on them.

 

[noah89t]

that wire you are thinking about has been reconnected. setting my timing is not the problem, it's trying to figure out why my car won't idle on its own.
today i was able to spray some carb cleaner around my intake manifold and upper plenum and the car did idle up dramatically within 2 seconds, so i guess i somehow have an intake leak, which i will address. it's weird though, since all my gaskets only have about 13k miles on them.

 

[CajunKenny]

Since we're all stabbing in the dark here...have you re-checked all of your intake bolts and intake fittings, clamps, and such since you last replaced the gaskets? It's funny how things work loose.

Just a thought...

 

[noah89t]

indeed i have, but tomorrow i will be ordering new gaskets for the intake side just to knock one more thing off my check list. it new gaskets don't help, i guess i will find out where to get a leak down tester or find someone who has one.