I have a 2001 ITR with a Built 84mm motor. I am running a P28ECU chipped for hondata. I recently sold my hondata but kept the P28 ECU. My car has been running fine with the Chipped P28 but cant rev past 4000rpm. That is perfectly normal. My car is running normal.

here is the Problem:

I tried to switch out my ecu with a stock P72 OBD1 GSR. Car barely started and was puttering and jerking to get going. smelled like fireworks just went off. I put a P61 ecu which is a B17 ecu in and it does the same. I decide to put my Chipped for hondata P28 ecu back in and my car wont start. I reset the ecu and it still wont start. I put my friends 2000 B16 Ecu in and my car starts and then immediatly shuts down. It wont start. for each ecu i am throwing a Code 3(mape sensor). I change out the map sensor and still the same problem. I dont understand the fact that my P28 wont work and make my car start anymore.

can anyone help out. thanks.

 

The problem you are having seems like you might not have a check valves or missinglink in order to trick the ecu when it comes on boost. There isn't a map for the honda ecu passing 100 kpa, so therefore the check valve or missinglink tricks the ecu that the motor is running base on a N/A fuel and ignition map. make sure you have a FMU with your application as well. Good luck!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by James L. &raquo;</TD></TR><TR><TD CLASS="quote">The problem you are having seems like you might not have a check valves or missinglink in order to trick the ecu when it comes on boost. There isn't a map for the honda ecu passing 100 kpa, so therefore the check valve or missinglink tricks the ecu that the motor is running base on a N/A fuel and ignition map. make sure you have a FMU with your application as well. Good luck!</TD></TR></TABLE>

Sorry guys I forgot to tell you.

This is a brand new built motor with just 3000 miles on it.

with no Turbo set up on it yet. Just a regular motor

 

When i first got the motor running, my friend let me run his P72 obd1 ecu just to get the motor broke in. He needed it back because someone wanted to buy it. Then i had no codes at all. everything was perfect. I put the P28 chipped ecu in and couldnt rev past 4000rpm which is normal and my car still ran fine. I switched to a different P72(this one was a short looking box). the one my friend let me borrow was a normal looking ecu box.

I just dont understand

 

There is a possibilitie that when a map sensor got blown, the hole on the throttle bodie that the map sensor get its vacum might be plug up. So you might want a check that because I seem it happen before. Or try to pull the vacum somewhere else in the intake manifold for the map sensor. When the map sensor is plug up and the map sensor is good, it is going to give the fuel map that's at 100kpa, so therefore it throw a check engine because the motor is so loaded with fuel.