Originally posted by wayneboitz
The old harness and computor, MEFI-3 only read air coming in and the new harness and computor MEFI-4 reads air coming and going out, it has a 02 sensor. The computors have different part numbers and the harness are not the same. It sounds to me like the first series was a design problem and they tried to correct it with the new one. The moter was expensive and the original computor didnt work and the upgaded kit helped it idle some what better but it still serches,and standing behind the car running gags you. I have checked for vaccume leaks and are none.
if its doing about the same thing as it was doing to start with then it probably is the same thing, When the computer find something wrong, that's what it does. it searches until it finds the best setting, but if the problem is out of its range then it cant adj. to it. cant the system be checked for codes? sounds like a vac. leak or a bad sensor and the computer is trying to make up for it by making the motor run richer. have you hooked a vac. guage up to it. with computer motors when something is wrong with it, it dont sound or act like a conv. motor, because the comupter has changed the fuel and timing settings trying to fix the problem. id look hard for a problem with the motor or sensors