weird misfire

[dsmike1]

hi everyone. im getting a cyl 2 misfire. its not a normal misfire though, it happens after i drive the car about 40 or 50 miles and the engine needs to be shut down once within those miles. for example: i have been swapping the battery back and forth so it will sit in my driveway for a couple days. i will put the battery in, drive to work, park the car, 8 hours later start it up. on the drive home cyl 2 will die completely. no matter what rpm. heres the kicker, while rolling down the highway shut the engine off and start it back up.and the skip goes away. then about 30 seconds to 2 min. later it starts skipping again.
so i limp home, grab my scan tool, and reset the cel. the problem will go away then after work the next day same thing on the way home.

it seems to me that it has to do with the ecu monitors. once i complete the drive cycle to set all of the monitors the problem occours. reset the monitors and it will go away untill i complete another drive cycle.

97 gst
2.3l 6 bolt w/2k on it
1000cc fic's
dsmlink v3
95 eprom
blacktop cas
stock coils

 

[DSMopar]

Sounds like someone didn't research a 6-bolt swap....

http://www.magnusmotorsports.com/wp-content/uploads/2010/02/1gina2g.pdf

Basically the CAS signal isn't as clean as the crank trigger on a 7-bolt and the ECU thinks you're getting a misfire and shuts cylinders down. DSMlink I believe has an option to turn off the monitoring of misfires...

 

[Timechg]

^on DSMLink on the DTC tab uncheck the box that checks for random misfire. This will solve your issues.

 

[dsmike1]

The thing is. I have already checked the box to shut down the misfire monitor.

 

[Timechg]

Did you save the settings? Have you done a blt?