Ok I have a 1994 camaro I took the v6 out and I have what I think is a 85 to 87 5.0 tpi motor I'm putting in it I have a 7730 ecm with a 1990 tpi prom I'm having a lot of problems starts and dies once in a while it will run good how can I tell if the ecm is bad and the only way it will start and run is if I un plug the coolant temp sensor and plug it in to the map sensor that came off the v6 motor I took out of the car new fuel pump and icm cap wires plugs water temp sensor and timing keeps jumping around

 

You say you are plugging the coolant sensor wire into the v6 MAP sensor? That can't be right. Did you mean unplug the temp sensor and leave it unplugged and use the MAP from the old motor? Ill tell you right now, you need the temp and MAP sensors functioning for it to run right. You can either use a scan tool or bench test those two sensors to verify their operation. Then approach it logically, verify all sensors are working correctly, tps is adjusted correctly, fuel pressure is good and so on.

Did this engine and ecm run together before or is this a new setup?

 

I ment mat sensor not map

This is a new system and I have the air temp sensor plugged up under the upper intake

I bought a cold air system and it has a hole in it for some type of sensor and I stuck the one in it out of the old motor so it didn't suck somthing down into it I was trying to get it to start one day and it would start and die all day long so I unplugged water sensor and pluged it up to the old motor sensor and it did start ran rough but it did run I have never worked on a tpi system and don't no much about them.... I bought the painless wiring system hoping I would not have any problems...... but that's not the case so I need aLL the help I can get

 

Here is a video of what I am talking about
copy URL and past on YouTube please help


https://youtu.be/Qpgp25G9ok8

 

Ok I see what you are doing now. Those are two different sensors that happen to have the same connector obviously. It looks like the connector has yellow and black, if the painless wiring is keeping the color code from the factory that is for the coolant temp sensor so that is correct. The IAT and CTS sensors have similar if not the exact same resistance curve so when the engine is cold the air temp and coolant temp should red approx ambient so if it were 80 deg outside and the coolant is at 80 both sensors should be in the 2500ohm range. As the temp rises the resistance will fall. Now, the fact that it will run with an air temp sensor tells me we should check the sensor in the motor and verify it's value. If the value is lower it should be than there is a chance the ecm thinks the engine is warm and is not enriching to start. See the attached chart for values.

You should have a IAT sensor mounted in the plenum toward the rear? Is it connected? Check the resistance of that as well. EDIT: I just read you do have this connected, still should check for correct reading.

Last, are you able to get MIL codes if there are any? That will help give direction.

 

Thanks for the info I will try to check the car out after work when I get home and again thanks for taking the time to help me out