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Just had a used 2.8l v6 installed and it seems to be having a few issues. I think it's all from the ecu needing a tune. It idles low and high and drives a little as if it needs a tune up (which it does NOT) and when I ran trouble codes on it, it threw 5 codes then when I reset the battery it only threw 2 codes and after I cut it off and cut it on it on it idless normal then idles rough the next time any ideas??
Hey man, well I just talked to a guy about my troubles and he thinks that the car needs to be tuned/programmed. The reason being is because the previous owner had the engine bored .4 over and it threw codes such as rich idle, lean exhaust indicated, electronic control module fault or oxygen sensor or EGR solenoid #3 failure or fuel lean monitor
Last edited by Digs_do_it89; Nov 5, 2015 at 12:30 PM.
Reason: Typo
Hi there,
Wow. Well, first I have no experience with a code 55. I looked it up and it indicates your ECM may be bad. May be. But before you rush out and spend money on a replacement, check a couple things first. Check the connection to the O2 sensor; it may be reading faulty (that's what code 44 is saying) and it could be throwing off your ECM. Next, check the connections at the ECM, they might not be seated properly. Also, check the connecter for the TPS; this could be giving a bad reading. Once you are satisfied the connections are all seated properly, then reset your codes and check them again. One last thing - check that your battery is fully charged and your alternator is charging. If the ECM is not getting the proper voltage, it can go haywire!
If the connections are okay, then yes, you may need a new ECM or a tuned chip.
I would think if the engine was bored .40 over, the ECM could still handle the modification. The engine is now a larger size, but the ECM could compensate by holding the injectors open a little longer. The 44 and 55 seem to be indicating that the ECM is not able to compensate for the change even by holding the injectors open all the way, causing a too-lean condition. That seems improbable, since the engine is only approximately 1% larger; well within the ECM's ability to adjust the injectors. So it seems to be indicating something is very wrong.
So try all the connectors first, and see what happens.
Just checked one more thing: code 44 may be indicating a misreading O2 sensor. $13.00 at Rock Auto. This could be throwing off your ECM. Might be worth replacing the O2 sensor before dumping money on a new ECM or chip.
