ACDELCO Part # 19205364 MODULE,Powertrain Control w/ACTIVE BRAKE CONTROL(JL4) or 4-SPD AUTO TRANS(MU4) Base Model. Not sure which ACDelco model to pick there-Vibe is AT, FWD, base w ABS. Does a dealer have to do it, or can I do it myself? My husband thought of RockAuto as a place that might carry new ECMs. I’ve also read that swap outs may need programming. I’m wary of a used one (from eBay) unless I could get one from an owner who swears he got at least 30 mpg. Is there any way I can hack the existing computer to fix it to get better mpg? I’ve looked online for used and new replacement ECMs. I still think the lousy mpg is due to some defect in the computer. Hard to read those small numbers, but with a mirror, I think mine is 8746, so the chart said it was “good” and not eligible for the replacement under the recall. We had the tires rotated so the better ones are on the front. Since they were more worn than the back, I imagine the previous owner had had the same problem for some time. The Vibe was squealing the front tires when we would drive off from a stop. I searched for reasons for the poor mpg and found a thread about “jack rabbit starts and poor mpg of 19-21” and think mine may have an ECM computer problem. Plenty of power and no CEL, so we don’t think O2 sensors or catalytic converter would be the cause. Bought new spark plugs and PCV valve but haven’t put them in yet. We replaced air filter, put Techron fuel additive in two times, cleaned MAF sensor, using the excellent instructions we found on this forum. However, gas mileage is poor, less-than-expected 23 mpg, no matter city or highway, no matter gentle or more aggressive driving. Around 95,000 miles now and seems to run good. I bought a used 2006 Vibe base from a GM dealer a few months ago.
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