DTC 26 is not just for the EVAP purge solenoid in a 93. Its for quad driver module #1, which controls:
-AIR pump
-EGR vacuum solenoid
-EVAP solenoid

You used a 94/95 code list. Several codes are different in the 93's. Read Shoebox's list, 93 code differences are shown on the right column:

http://shbox.com/1/Dtcs.htm

If you know you have a code, why not fix it?

 

I checked the key...not the problem.

As for not fixing the DTC26, I was in the process of trouble shooting that one and it wasnt that urgent to fix it since I only drive about 5mi to work and thats really all I drive the car. I replaced the solenoid but the DTC 26 was still there and I have not had an oppertunity to dig deeper. Seems I cant keep up with the car falling apart.

A side note, the opti was a GM replacement which is why I am still holding out on just replacing that. I would think it would last longer than a year.

 

Replacing the EVAP solenoid didn't fix it because it was one of the two other items that can cause DTC 26 on a 93. I'll put my money on a blown fuse for the AIR pump.

 

No, VATS does not affect spark. Remember, I said you may have more than one problem.

 

From the sounds of it, maybe I should take it to the dealer and have them figure out what the problem is and if its something I can fix then I will pick it up and fix it. If not then I will pay an arm and a leg to have it fixed.

 

Clear the codes (pull "PCM BAT" fuse for 30 seconds). See if DTC 16 comes back when you try and start it. If it does, that is a pretty good indication that either the Opti or the short Opti harness has a problem. Would seem a lot cheaper than giving up and taking to a dealer.

 

Thanks injuneer. I got the car home today so I will try to trouble shoot it more and see if there is anything I can narrow it down to.

 

OK I cleared the codes and now the only code I get is DTC 16. All others are gone.

What now? How much is the short Opti harness and where can I get it? That seems cheaper than going all in for the opti. Can the harness be tested?

 

Look at both ends of the short harness, and the parts it connects to, for corrosion and bent pins. Make sure the clip that locks the connector to the Opti isn't broken off the harness connector.

Casper sells a cheap replacement, as does EFIConnection.

 

Both ends are in what seem to be good shape. Should I go ahead and order a new opti and harness. Is that the most likely thing(s) it could be?

 

If DTC 16 keeps coming back, it means the PCM is not getting the low res pulse signal from the Opti. It needs that signal to set the ignition timing. When it can't find the signal, it shuts down the fuel system, and the engine will not start. There is no other cause of DTC 16, besides the optical module in the Opti, the short Opti harness and the rest of the wiring from the short harness to the PCM.

 

Well, I finished checking the wires and it is looking like the opti. Espescally after what you (injuneer) said about DTC 16. Guess I know what I will be doing over this holiday weekend.

Thanks for your help and if I am way off and shouldnt get a new opti let me know that too.

 

Replaced opti...Still no crank and now DTC 41.

I also just replaced the coil with no luck. I followed the trouble shooting guide in the '93 Camaro service manual (led me to replace the coil).

Need help bad!!!! What would cause this and how do I fix it?

 

So just for the heck of it, I put an old ICM on the car and it started with no SES light. The car ran terrible so Im thinking that its the old ICM.

For all who helped me on this problem thank you!

So with a DTC 16 I replaced the opti and that went away. Was it really the opti that was bad?

Fo rthe DTC 41 I replaced the ICM with an old one and the car started.

Do you all think that I had multiple problems or did I just get it wrong in the first place? I hate that I replaced the opti if I didnt have to.

 

DTC 16 is set when the PCM does not see the low res pulse from the Opti for two crank revolutions. There is nothing else that will set the code.