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A good rule of thumb when multiple codes are present is to disconnect the battery to clear them then see which ones return. If there are still several codes indicated, begin troubleshooting with the lowest numbered code first, as each one is diagnosed and repaired, clear again and recheck...

Why guess when a little basic testing will give you a way better chance of fixing the problem? Use the link below for instructions on how to pull any stored fault codes using just a paper clip. Recovering the C4 ECM Codes - www.c4vettes.com If there are codes in memory use the information as...

Not on a 93, see this link Recovering the C4 ECM Codes - www.c4vettes.com

Delighted to hear you have made some progress John. I think my next step would be to clear the code, install a fuel pressure gauge and tape it to the windshield then drive to see if code 55 returns, keep a close eye on the fuel pressure at WOT to see if it remains within spec.

\ Fairy tale.:L

I would agree that one knock sensor is better than none, but don't understand why you don't replace the connector. It is available here, see the third row from the bottom. EFI Connection - TPI Pigtails The injectors do not need to quit firing to get a lean condition, all it takes is a clogged...

Sounds like you have covered most of the bases on the fuel system, the only thing I see remaining is injectors themselves. The resistance check only verifies the coil is within specs, the injectors could still be partially clogged and fail to deliver enough fuel. I too had the code 43 in my...

I would have to question the wisdom of moving the knock sensors, particularly because the FSM indicates that even adding more sealer to the threads can degrade the signal. Just my take, I'm not an engineer, just an old grease monkey.:L

Your theory sounds as good as any. It does not seem to be one of the first 93's built and I am not sure when the Ruby package was introduced. You might want to try posting this in that forum, maybe someone there will know. Have fun figuring it out, let us know what you discover.

That is an interesting window sticker, is the car a very early build?

My 93 has a gear change, high stall converter and other mods, the car is a toy that is only driven a couple days per week so I pay no attention whatsoever to mileage. On a daily driver I would expect to see a drop in fuel economy by lowering tire pressure.

As 93Rubie indicated the door sticker on 93 cars shows 35PSI. it is my understanding that was lowered to 30PSI starting in 1994 so I use that pressure in mine, definite improvement in ride quality and I have not noticed any increase in tire wear.:thumb

Glad you got it sorted out, the instructions were from my 93 owners manual

Oil Change Light Shut-Off Procedure 1. Turn the key to the RUN position but don't start the engine. 2. Press the ENG MET button on the Trip Monitor. Within 5 seconds press the ENG MET button again. 3. Within 5 seconds of step 2, press and hold the GAUGES...

The SES light indicates there is a fault code in the ECM, the fan runs by default when many codes are set. See the link to learn how to pull the codes using a paperclip. For best results troubleshoot the code using the correct factory service manual. The codes do NOT indicate a part is bad...

Think again, it is the clutch.

I just noticed a similar thread on the "other" forum, but it was a newer car with ASR, the servo on that system complicates the issue. The only thought that comes to mind for your problem aside from the cable is the pedal mechanism, any chance it could be worn and causing a bind?

Assuming your 94 is the same as a 93 (never a good thing) CCM code 41 is for ECM Serial Data Circuit ( loss of communication) This is the communication circuit between modules such as CCM, PCM, and EBTCM. As John Robinson pointed out wiring could very well be root cause of the problem. Since...

There is no "valve" in the passenger side cover, the hose you see from the throttle body to the valve cover is the fresh air supply to the crankcase mentioned by vetteoz.