compustar cs 600s tachless mode failure

I have installed hundreds of these starters and usualy have good results with them. Recently i  have had customers coming back complaining the car wont start, it trys to start 3 times and then shuts off. This is happening in tachless mode. I am having cars come back tha thave worked for one or two years then they start having this problem. I am seeing this problem in all types of cars not just one make or model. Usualy if the car starts in tachlessmode in the shop everything is good. But I dont understand how it couldwork for a year or two then have problems. A couple other shops that I know that use this model are having the same problem. I almost seems if the tachless mode fails or degrades over time.

When I do my installs I usualy solder my conections. I have found vehicals with thin ignition wires tend to not work wel lwith tachless mode.

Now for an example I have first noticed this problem with Ford Escapes they will work tachless most of the time but usualy will fall to start at some pont. So I will always hook up a tach wire when I do thes vehicals. I have installed some other brand starters like Scytec in this specific vehical and did it tachless and had no issuses with it starting

I really like the Compustar products but this problem along with the mysterous valet mode issues could be a deal breaker.

Have you tried programming option 2-04 to Opt 4 for those "one touch" start vehicles?

I've only used a few CS600-s so far and always connected to a tach signal.  Only thing I noticed is that they seem a little sensitive and will continue to crank if you did a Tach Learn at a fast idle.  They also have very good range for an AM transmitter.

Yes yes I use that option as much as possible.