the HO computer doesn't let for data stream... you need the NON HO PCM for that.. also the injector firing order for the HO engine is different than the ignition firing order on the factory 289 firing order.. lil things that need to be addressed...
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Thread: ECM options
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02-28-10, 12:39 PM #1Senior Member
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02-28-10, 09:16 PM #2Junior Member
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That little thing has been addressed with a 351 cam. After changing the firing order for the injectors and running fine I found that the o2 sensors cause the ECM to bank fire the injectors only for the rich/lean cycle. Thuse I had a rich bank and a lean bank all the time that the ECM could not compensate for. So I installed the 351 cam and returned the injectors to thier stock location. Last year everything was clean as a new car. Somethings or things have failed sence then. This is why I need help. When I tested the MAP sensor it said I was about 1500 ft below sea level, this would certainly make the engine run a little rich. I replaced the MAP sensor and it improved a little all across the board, but I still have CO's about three times the allowance, while HC's are little high, they are not bad. This is why I am looking for way to get the data stream to see what is going on. If I install a non H.O. ECM, will this creat different problems as that would run the same firing order as the stock 289?
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