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Ran the test again. Cleared the codes. Restarted a cold engine. First two minutes the engine idled fine. Throttle responded normal. After running four minutes the rough idle started to return. ...

I’ll have to try it again. As best as I remember I was trying things all morning. So the car wasn’t dead cold. When I cleared the code, I restarted it and ran it a couple of minutes each time. ...

We’ll continue looking.👍

Just some thoughts. If the engine runs preferably after wiping the codes, and then after a number of restarts it runs roughly, then one of the sensors providing input to the SBEC unit must be...

Some additional information on the problem. I can disconnect the battery to reset the SBEC unit. The car starts and idles prefect. Playing with the throttle everything is just fine. After doing...

It would be hard for me to think the harness is bad. I’ve had the car since new. Only 19,000 miles. There could be some wire corrosion on a connection other than the SBEC. I have two SBEC units....

Sorry, I haven’t got back on line sooner. I was out of town for the fourth. I’ve done the vacuum leak testing with the propane method. After about an hour I could not find anything. The gas should...

Our Shelby #128 is for sale. One owner. 19,000 miles.

Thanks for the suggestions. I’ll give them a try. With no EGR valve, it explains why it looks different. Don

I purchased this 1989 CSX new. It only has 19,000 miles on the car. The car developed a rough idle. It is a rough idle like is caused by a bad EGR valve. From the Haynes manual and EGR pictures...

FWD had an engine control module for the CSX. Thanks cordes. PS the part number for the 1989 Shelby CSX is 4516837. Not sure where the 04549811 comes from.
Don Klepel

Thanks cordes, FWDperformance may have the engine control module I need. Don Klepel

Cordes, thanks for explaining the abbreviations. I’ll try contacting them.
Don Klepel

Chromguy, I’ll keep you in mind. When I figure out what I need to do, I’ll get back to you.
Don Klepel

Cordes, I’m not familiar with your abbreviations FWD and TU. To me FWD is four wheel or front wheel drive. So please fill me in. Thanks. Don Klepel

We’ve had the car since it was new. When it was 7 years old I had to replace the engine control module. This spring it died just as it had 23 years ago. At that time I could purchase a module from...

I’m looking for help finding a SBEC engine control module for our 1989 Shelby CSX. Part number 4516837.