Trying to help out someone. Has a 6 speed coupe that has had a consistent problem since we got it going last year. It was his Dad's car and had been sitting awhile.
If the car stalls it will not crank and he has to disconnect the battery and then it will restart. He has been teaching his girlfriend to drive a standard and it has made it less than optimum as she loses confidence.
It has had the same thing happen when going to start the car but only randomly and infrequently. Usually start right up and this mostly happens in a stall situation
I did install a new RCM last year and had it resoldered before installing. He did throw the old RCM back in and it did the same thing
The battery has been replaced. Ground cables replaced
He does drive it daily. So not sitting around
He has spent fair dollars getting maintenance up to date including having the plugs and wires changed but nothing else electrical
The fan is not running on high when key turned to on after 30 seconds.
Only post I could find remotely related was something to do with the Engine control relay but don't understand how it would be the same with his original RCM and new RCM.
Also how disconnecting the battery each time would correct it.
He has an off/on turn switch on his battery as it was not driven much by his father. He says he shuts the battery off for a bit then on and it will start.
He says that over the last year and a half it has done this nearly fifty times and rarely takes more than one shut off to reset it and start up.
I have another new RCM to try but thought I could give him a little confidence if someone could give me a clue where to look if it is not the RCM
I am not a mechanic or electrical guy but have done 15+ sticky keys and other fixes but can't figure this one out.
I have searched for months and not found anything so maybe Mark pizzaguy or DJ Tighed1 could give me some direction. Questions and suggestions appreciated. Thanks, Ron