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How to detect a faulty Opti Spark How exactly can I tell if my opti spark is actually defective? Eractic idling is the most noticable issue from the engine. My drop down gear is not working anymore ( 4 speed automatic )and neither is the ASR. I have had my local mechanic take the readings...

I was told that since I have to replace the opti spark on my '94, I am better off buying a vented '95 or up version. Any thoughts on if this is recommended?

Reading your notes on the interior lights, I am wondering if this may be related to a problem I am recently having. My battery is going dead after a few days and I was able to determine that my interior light fuse was the culprit. There is quite a bit of current, when I disconnected my...

I appreciate all of your responses. All of the issues that I mentioned seem to have happened all at once, after a long road trip from Toronto to Boston last year. When I am driving the car, it will up shift normally, but once I pull out on the highway and accelerate, it won't "downshift" to...

I am trying to determine if I need to replace my Opti spark on my '94 Automatic, after 80,000 miles. The engine is idling irratically, the drop down gear won't work and my ASR service light is on. I just replaced the TPS and ECM and had all the codes cleared, but the above issues are still...

I'm not sure if you fixed your problem yet, but if you haven't, I had to replace the small plastic T valve that was located under the plastic Corvette shield that clips on top of the passenger side of the intake. There was a small hole on the under side of this valve and once I replaced it, my...

On the subject of improved sound, I have a '94 coupe and I would like my car to sound a bit louder. What is the recommended way of doing this, relatively inexpensively?

I don't know if this will work on your '96, but on my '94, I had the key turned off, took a paperclip and connected the #4 and # 12 pins, then turned the key on and wrote down my error codes. I posted this issue on July 25th, titled Error codes on OBD2 for a '94. Here is one of the responses...

I appreciate your replies everyone, to my problem. Answer to the question above: The codes came up on my dash, at my speedo location. The codes were in large letters / numbers ( probably 2 inches high ) and the related numbers were smaller, about a half inch high. It looked like this 1...

I asked Gordon Killebrew about the issues that I was having and he mentioned that it might be related to the Opti spark. ( ASR not working, passing gear not engaging, erratic idling ) He then told me to join the 4 pin and 12 pin, to get my error codes. The pin connector that I have has 16...

1994 LT1 I need some help deciphering what these error codes mean. I have a 16 pin DLC and I grounded the #4 and 12 pin, that was recommended for me to do. The error codes that came up, were as follows: 1 H32 1 H34 1 H36 1 H38 4 H22 9 H64 Can anyone help?

On my 1994, there is a cable coming off of the ASR box that goes to the throttle body. This cable has a plastic snap clip, that allows the setting to be moved up or down the cable. Does anyone know where the proper setting should be on the cable? My ASR is currently not working ( Service ASR...

I have located the upper and lower ball joint grease fittings on my 1994. In the repair manual that I have, that covers the C4 from 1984 to 1996, it indicates that there is / may be fittings for the steering linkages and the rear axle tie rods. Does anyone know if those grease fittings exist...

SYS Flashing The bearing went on my alternator pulley and I believe it was causing my "SYS" to flash. I just replaced the alternator yesterday, so I haven't been able to confirm if it stopped flashing yet. Question for Topless; How did you know that you had a dead cell in your battery?

1994 Grease fittings location Good evening everyone; Reading my 1984 - 1996 Automotive Repair Manual regarding chassis lubrication, it states that there is grease fittings for the steering linkage, ball joints and rear axle tie rods. On my 1994, I can find the upper and lower ball joint...

Drop down gear Thanks for Gord's full name and address. I will call him if it comes to that. I received the steps on the ASR issues and I will tackle it next weekend when a mechanic friend is coming for a visit. Referring to the first post I wrote, do you think the drop down gear and SYS A/C...

Carlisle Pennsylvania speaker Thanks for the welcome. There looks like some interesting comments throughout the pages. Hopefully I will be able to pick up a few pointers. My wife and I were at the Corvette Carlisle show in 2000 and there was a very informative guest speaker on C4's. I think...

I need some help regarding a few issues that happened during a long road trip I took in my 1994 automatic, last fall. The ASR light constantly stays on and does not currently work right now. My drop down gear won't work, when I step on the gas. Another issue that may or may not be related is a...