New Member, New Problems - PICS ADDED POST 3, 1994 7A-FE with a couple of trouble codes Options

[boony]

So I'm getting code 51 (Knock Sensor) and 72 (EGR system) codes on my 1994 ST auto. I just got the car extra cheap as a beater and frankly know little about it. I know it is not stock.

The car runs (but is slow to me, but that's the nature of it I think). The engine runs and idles smoothly. The AC works, etc. These codes come on at random while driving and stay on until cleared (this has happened twice in my 100 miles of owning it). Gas mileage seems to be superb. The engine temp gauge on the dash barely goes above 1/4 of the way up, and it stays where it is after it reaches that position.

So, 6g gurus, what do you suggest. I will attempt to post some engine bay pics early this afternoon. This will soon be my only car and I need it to run well for at least another 50k miles. It has 190k on it, new belts (including timing), new seals (including rear main), and new gaskets.

This post has been edited by boony: Jul 30, 2009 - 1:07 PM

[boony]

PHOTOS:

From the driver's side looking down at the headers, which are obviously not stock - not that sensor hanging out down there.


And a bit closer up:


Back on the firewall, it looks like this. Note the sensor connector zip-tied up. There are actually three sensor plugs in that harness that are not plugged in:


Another angle of that area. The sensor plugs are a little out of frame toward the top:


Toward the firewall on the passenger's side:


Airbox - not that the battery is apparently backwards, so the ground is stretched taut. Looks like it should be slack. Also looks like there's some sort of hose elbow missing between the airbox and some duct that comes from beneath the fusebox:


Lastly, under the alternator and towards the passenger's side of the motor, there is (by the oil filter) a sensor. Is that a knock sensor? If so, there's a tiny strip of yellow wire that looks like it's on its last legs connecting it to something I cannot yet see. Could this be why I'm getting the knock code or have I misidentified that sensor? This is the area - if you had X-Ray vision, you'd see the wire I was referring to. :lol:


Any help is appreciated, guys. I know Imprezas, not Celicas. Tell me what's wrong with these pictures so I can go about getting it corrected.

[stephen_lee]

PHOTOS:

the sensor on the headers in your O2 sensor. that plug should clip into the fan shroud on the radiator


And a bit closer up:


these are the EGR sensors. one is to control the VSV, and the other is for the thermistor.


Another angle of that area. The sensor plugs are a little out of frame toward the top:


Toward the firewall on the passenger's side:


Airbox is pushed over towards the pass side. that may be a GTs airbox.


I believe that sensor & plug you are talking about is the oil pressure switch. Does your oil light come on when the engine is off and the key in the on position? and go away once it starts?


Any help is appreciated, guys. I know Imprezas, not Celicas. Tell me what's wrong with these pictures so I can go about getting it corrected.

i commented above certain pictures.