Hi, I just swapped a d16z6 in to replace a busted-*** y8 a month ago. The y8 was running odb1 with a chipped p28 ECU. The chip (supposedly) was a y8 stock fuel map, disabling a few sensors, and enabling the use of a 1 wire o2 sensor.

When I did the swap, I had a few minor issues, but never saw a CEL come on. I found out just recently that this was because there was no CEL bulb in my cluster! After replacing the bulb, I have a constant CEL. When I jump the blue service connector, nothing changes. The CEL stays solid, never blinking.

I have found in searches that this is supposed to mean that my ECU/Chip is bad. I'd like to check this out, but I know that if I was to swap in a virgin p28 ECU, the car probably wouldn't run right. This is because of the 1 wire o2 sensor and the lack of a knock sensor and some other goodies.

Right now, the car runs reliably but has a surging idle, only gets 20mpg, and I have no Vtec.

Would getting a new chip or a new socketed ECU for the chip I have be a good idea? If not, what should I do to fix my mpg and get rid of the CEL?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Maireeka &raquo;</TD></TR><TR><TD CLASS="quote">I have found in searches that this is supposed to mean that my ECU/Chip is bad. I'd like to check this out, but I know that if I was to swap in a virgin p28 ECU, the car probably wouldn't run right. This is because of the 1 wire o2 sensor and the lack of a knock sensor and some other goodies. </TD></TR></TABLE> Well you are just in luck, the D16Z6 doesn't have a knock sensor and as long as it's just the One-Wire Oxygen sensor instead of a million things wrong it will limit your codes to Code 41 / 42 (Whichever is the Oxygen Heater Code) and then what is wrong in your system.

 

ok, so you agree that the ECU is probably bad? Then the car should run good, with decent mileage, if i swap out ECU's? I thought the 1 wire o2 on a non-chipped p28 would cause me to have worse mileage than I already have.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Maireeka &raquo;</TD></TR><TR><TD CLASS="quote">ok, so you agree that the ECU is probably bad? Then the car should run good, with decent mileage, if i swap out ECU's? I thought the 1 wire o2 on a non-chipped p28 would cause me to have worse mileage than I already have.</TD></TR></TABLE> Well if it makes you feel any better, I managed to pull 38 MPG on my first leg of Orlando --&gt; NC throwing the Oxygen Heater code.

 

ok, now i'm looking for a virgin p28 to put in this car. think it should help my mileage?

thanks for your help.