hey guys wondering if you have any ideas what my problems could be, heres a list of what im running so far
h22a
9.1:1
gtx3582r
built head/bottom end blah blah blah

anyway i have the s300 with coil on plug it was my first startup today and car was running like bag of sh*t. i have a 4 bar map sensor and its weird cuz i only have 12" of vacume with it so i thought it might of been faulty so on base map put as stock and car had 17" vacume but still low, very rough idle when set as 4 bar.
thats my first problem.

second is solid engine light intake air temp,but i dont think that would cause low vacume, i took the car down the street with map sensor set at stock but get ign cut at 2500rpm. im changing the iat sensor tomorrow but i dont think that would cause my vacume or ignition cut problems.

does any one have any thoughts what would cause this and no theres no vacume leaks

thank you

 

yes, that iat problem will cause all the issues you're having. it's going to limp mode because of it, and is running super rich and retarded, which would not allow it to idle at all normally. but the ecu is maxing out the idle valve to maintain an idle, which is why you have low vacuum.
and the low vacuum and rich/retarded conditions are the reason it's idling like crap.
the 2500 ignition cut is also due to the iat sensor fault code.

by the way, iat sensors almost never go bad unless you physically break them. check your wiring, may be a wiring issue.

fix the iat issue before doing Anything else, as that is a HUGE issue that will affect everything in a very major way

 

thank you wired sensor direct to ecu and still code pops up so putting in new sensor thanks for reply

 

I've never had a car that went into limp mode from an IAT code. Ever.
It sounds like you just need to calibrate the MAP sensor correctly. 4bar MAP settings in SManager have never worked right for me, I always have to customize it. Make sure your atmospheric pressure is the same as your MAP at KOEO. If it's not, adjust the scales until it is.

 

ya so i fixed the problem with iat wired direct to ecu along with map and iacv and tps. i figured out that wireing harness
was botched, bad soldering i belive cuz when i jiggle wires runs good for a bit then throwes codes so im just going to junkyard and going to get another harness.

hopfully thats where my problems end but i doubt it.

thanks again

 

the ecu with throw an iat code if it detects any issue with the iat sensor whatsoever. if it's only a blip in incorrect signal, it'll throw a code. if it realizes iat is higher than ect, it'll throw a code. but the only way it will go into limp mode is if the ecu detects no signal at all from the iat, or if it reads pegged full hot or full cold.
you probably have just never had an iat sensor fail completely to a point where it goes into limp mode. or, maybe you have obd2 where you have an ambient temp sensor too. if you have an ambient temp sensor, and the iat sensor fails, the ecu will not go in limp mode and will just use the ambient temp sensor as a failsafe for iat's

 

I've tuned hundreds upon hundreds of Honda swaps, many where the IAT was disconnected, broken/cut off, or switched with the IACV. I've never experienced limp mode from it. Not once, on any application.
Ask any experienced PGMFI developer, this is not a characteristic of a Honda ECU.
The MAP and TPS will certainly cause limp mode however, which was the case here.