help reading live data

[1kick]

hello i need help trying to understand what could be going on with my 97 eclipse gst i have some live data in the attached pdf file from a scanner it seems like all 4 injectors are stuck open it backfires at idle will rev sometimes its missing checked compression cold it had 100psi in all 4 140psi wet timing marks line up no dtc
i have also tested the wires from the injectors to the resistor box and to the ecu no shorts im stuck and need help please

 

[DSMPT]

I have never used this device but the coolant temp sensor and the air temp sensor are reading minus 40°F??? If so, should check the coolant temp / MAF (Intake air temp) sensor and the its connection/wiring. Possibly the issue is caused by a bad sensor(s) or wrong signal(s). Also reading the air flow "zero"?

 

[1kick]

thanks i will check does anyone have resistance values for these sensors the wiring is easy enough to check would these sensors contribute to the injector problem live data shows throttle at 100 percent could this be the throttle position sensor

 

[shinzon]

thanks i will check does anyone have resistance values for these sensors the wiring is easy enough to check would these sensors contribute to the injector problem live data shows throttle at 100 percent could this be the throttle position sensor

The lower the temperature reported by the intake air temperature sensor and the coolant temperature sensor, the richer the mixture will be, but it shouldn't cause the injectors to be "stuck open." What makes you think they are as opposed to the mixture just being extremely rich?

Since both the IAT and CTS are reporting bad values, and since they are both thermistors and receive the same 5v reference from the ECU, I'd suspect the wiring (powers/grounds) over the components themselves being bad, but you never know

I'd start with the CTS and check resistance, then check for power and ground on the CTS harness before moving to the IAT.

edit: did you reset your ECU prior to these logs? Short/long term fuel trims aren't reporting any adjustment--the ecu doesn't seem to think the car is running rich. Also strange is that the MAF isn't reporting any airflow, but the engine is clearly running in the log (and at wide open throttle??)...

Since so many things seem off, either I'm reading this incorrectly since I'm unfamiliar with this software, or your logger isn't reporting correct values

 

[1kick]

yes i just connected the battery prior to starting the vehicle i did not have the throttle open at all if i just turn the key on the fuel pump runs for a while stops then runs again there is also fuel in the oil when i pulled the plugs they were also soaked could the ecu be causing these problems i find it strange the check engine light is not on so if i have power and ground at the coolant temp sensor the ecu is working properly ant the sensor is bad

 

[jim95redgsx]

This sounds like a blown sensor ground in the ECU but it could also be a broken sensor ground wire (black wire) to ECU pin #92.
http://www.ecmtuning.com/wiki/blownsensorground

 

[1kick]

thank you so much so i opened the ecu the ground trace is burnt and broken i dont think it has a wide band i just purchased this car not running for really cheap so is the 02 sensor the only thing that could have shorted to cause the ground to blow what else should i check before i fix and reinstall the ecu

 

[rabenne]

I would try to find what caused the burnt ground trace... It could easily be caused by someone installing a universal o2 sensor incorrectly. Hate to admit I did that about 12 years ago... burnt the ground trace and wiped out the nearby transistor (maybe? long time ago).

good luck, and good work jim95redgsx.

 

[1kick]

thanks man hope i wont need a new ecu

 

[Dsm panda]

I'm sure the guys at ecm tuneing can repair it for ya my caps where bad and burnt the bord, looks good as new now. Definatly find why it happend or you'l more than likely have that happen again.

 

[1kick]

I hate threads that have no ending so the ecu was bad had a burnt sensor ground could not find the source that caused it to short installed an ecu I got from eBay it took a few driving cycles to get the vehicle to run right but it fixed itself thanks again for all the help now on to the next problem "overheating fml"