missfire, stalling out

[F_T_F]

ive had this problem for a while but i just thought it was a tuning issue as a resuld of a clogged cat and it still might but im running an unrestricted exhaust no cats. anyway at idel car sounds like its missfiring and sometimes even stalls. i checked timing that was ok TPS is ok spark plugs are new but checked them anyway and appeared to be ok. can anyone offer any insite im lost. oh and i noticed at idel car goes way rich like 10.2 but not all the time

[mkIIIman089]

Codes?

[F_T_F]

Codes?
nothing that wasnt there already code but it was a 51

[mkIIIman089]

51 Switch Signal


Diagnosis

* No "IDL" signal, "NSW" signal or "A/C" signal to ECU, during diagnosis check.

Trouble Area

* A/C switch circuit
* A/C switch
* A/C amplifier
* Throttle position sensor circuit
* Throttle position sensor
* ECU

[F_T_F]

51 Switch Signal


Diagnosis

* No "IDL" signal, "NSW" signal or "A/C" signal to ECU, during diagnosis check.

Trouble Area

* A/C switch circuit
* A/C switch
* A/C amplifier
* Throttle position sensor circuit
* Throttle position sensor
* ECU
i measured the resistance on the throttle position sensor and it came back normal.

[mkIIIman089]

Welp, any vacuum leaks or big holes in the IC piping?

[F_T_F]

Welp, any vacuum leaks or big holes in the IC piping?
nope vac on my guage reads ~10 in hg. and checked around the manifold for leaks and nada. ill check the ic and report back but i dont think ill find anything its in tip top condition.

[F_T_F]

checked piping and intercooler no holes or leaks what so ever

[mkIIIman089]

Well, my best guess would be the TPS or something causing the AFM to send an incorrect reading.

Mods?

[F_T_F]

Well, my best guess would be the TPS or something causing the AFM to send an incorrect reading.

Mods?
map-ecu, megan racing downpipe, custom cat back exhaust, hks bov, horsepower freaks intercooler, ct-26 with 57trim.

[Nick M]

10 inches of vacuum indicates a vacuum leak, or horribly weak engine.

[F_T_F]

10 inches of vacuum indicates a vacuum leak, or horribly weak engine.
i got the reading off my boost/vac gauge.
and i was a little off its closer to 15

[Nick M]

In Denver (I didn't even notice that part ::dunce::) that is close to normal.

Does the air fuel ratio constatly roll, or is it just sometimes that it moves?

[F_T_F]

In Denver (I didn't even notice that part ::dunce::) that is close to normal.

Does the air fuel ratio constatly roll, or is it just sometimes that it moves?
for the most part at idle it stays around 18 but sometimes it drops down to 10 and will idle at 500rpm then sputter and die. if i rev my engine up to 5000rpms or so that seems to correct the problem but its annoying having to rev it up at every freaking stop light just to keep the car from stalling out. i cant seem think of any other relevant information.

[Nick M]

The idle will die when you come to a stop?

[F_T_F]

The idle will die when you come to a stop?
yea

[Nick M]

You better take it to Toyota don't you think?

[F_T_F]

You better take it to Toyota don't you think?
if i must i was hopin to avoid it

[Imnotcreative72]

Do you have a spare set of coilpacks or know someone close by you could swap them with.

[F_T_F]

Do you have a spare set of coilpacks or know someone close by you could swap them with.
no but ill look in the parts section. you thinkin its the coil packs themselves

[Nick M]

No.

[mkIIIman089]

I'm blaming something on the map-ecu now.

It won't cause low vacuum, could cause that code though.

[cheverlot]

what type of spark plugs are you runing are they ngks or champions? what is the heat range?

[F_T_F]

thats a good question i know there ngk. ill check in the morning

[F_T_F]

well the spark plugs were acctually bosch platinums and they were no good so i went out a bought a set of NKG 3330's. as soon as the rain stops im going to put them in see if it makes any difference.