93 LX FiveO

My car keeps throwing this code along with Code 11 which has no description and Code 12 which reads: Could not hold RPM's during self-test

these are key on engine ready codes

with key on engine off code 11 pops up and thats it

i cleared them and they all come back. car is running pretty decent at the moment. still a few little things out of place.

93 LX FiveO

im pretty sure its the air pump or something emissions-related. i have an exhaust leak somewhere in the h-pipe but the O2's are good and no CEL

Twisted

Well, when I had that code (thermactor inoperative on left or right bank), I tested the whole thermactor system, part by part, but found nothing wrong. Then I pulled the metal tube that runs between the two heads, behind them, and found that it was clogged rendering the thermactor ports in my left head inoperable. I cleaned out the tube with a coat hanger and various other homemade items, and the code went away. It's not too hard to pull the tube; you may want to have a look at it, if everything else checks out ok.

mattdel

code 11 is a pass code, means no fault found. code 12 i'm lookin up right now.

mattdel

ok code 12 is an idle speed code, probably caused by a dirty/sticking IAC or binding throttle plate/linkage. 94 is the air system, coming back Inoperative. numerous causes here. look for kinked lines, cracked vacuum lines. Diverter valve or thermactor pump inoperative would cause this. Also the Air management solenoids.

Twisted

Just some more thoughts. That code 94 only indicates that one bank of the thermactor system is inoperable...if memory serves. I would think that if the smog pump or diverter/bypass valves were inoperable, he would be getting the code for the other bank being inoperable as well. I think the same would be true if the vacuum solenoids were bad also, but could be wrong. No doubt, he should check these items anyway...we won't know for sure until the problem is solved. I seem to remember also reading that a bad o2 sensor could cause that fault...although it should cause other codes as well.

AdderMk2

94 is a left side code for the thermactor.. it is also, but may not be currectly triggered by

Thermactor air system fault,
Transaxle switch solenoid fault,
Secondary air injection system inoperative (left side)

90Lxstanger

I ran codes, and mine threw a 94, i have no smog/air pump though

Ecstasy

Joel5.0

A code 94 will not trigger the CEL, if you have the Thermactor system still installed (AIR pump, valves, solenoids, etc), and no code 44 is showing up.....the most likely cause for the code is a clogged crossover tube tube to the LH cyl. head...same case Twisted had.....code 11 is a System Pass....worry when it doesn't show up... .....Code 12 KOER = system couldn't raise rpms to self-test range.....usually a bad IAC not opening to increase idle.......