Chrysler has very little trouble with their engine computers. Why did you replace it originally? What are the exact fault codes it is setting? You need to be addressing those codes. The computer is detecting those problems, and the codes tell you what the computer found. Replacing the computer will not fix the problems it detected. Also, be aware that unplugging the computer erases any fault codes it had in memory. You are doing yourself a disservice each time you do that.
For the failure to start and idle speed is too low, that is real common with a real involved solution. I will devote the entire last paragraph to the solution. You caused at least part of this by unplugging the computer. Disconnecting the battery or running it dead will cause the same problem. The computer loses its memory when power is removed. Fuel trim data and sensor characteristics will be relearned as soon as you start driving, without you even noticing, but that does not apply to "minimum throttle". Specific conditions must be met that tell the computer when your foot is off the accelerator pedal. Then it takes a reading from the throttle position sensor and puts that in memory. From then on, any time it sees that same voltage, it will know it must be in control of idle speed. Until that occurs, you may need to hold the accelerator pedal down quarter inch for the engine to start and stay running. You will not get the nice idle flare-up to 1500 rpm at start-up, and it will tend to stall at stop signs.
To meet the conditions for the relearn to take place, drive at highway speed with the engine warmed up, then coast for at least seven seconds without touching the pedals.
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Monday, October 30th, 2017 AT 7:38 PM
