LG5 Corsica hatch, coolant switch conundrum??
Posted: Mon Sep 10, 2018 12:27 pm
bought this car with the 2.8 3spd, block got so hot it split between two cylinders, pulled the heads and tossed the block (except for misc. external parts) I have a few donors and did the LG5 5spd swap, but used the same harness for the most part. Custom tune, 42lb injectors.
Anyway I run it at 160°, and once we were up and going it became clear why the 2.8 over heated, the fan refused to kick on. I had already put a brand new switch in below the thermo housing, before putting the new block in, fan still dead.
okay I went into wiring with my ohm meter. Beautiful ground, clear and concise according to the meter. went all the way into the ecu checking to make sure the switch had a clear path to the ECM. it did, I moved on. My guage works fine, it the temp sensor works. according to my datalog acquisition, the ECM again, sees the correct engine temp, but the SWITCH, reads -38 on the laptop.
But I changed the switch twice now, checked the wiring to no prevail! Still -38. Pulled my prom and told the ECM to leave the fan on at -38 so I can drive it without overheating, but as you can imagine it WAY over fuels, incredibly rich. Like 9 MPGs lol and I don't move it much to avoid engine anguish, I've spent to much on the motor.
Is it possible, the ECU itself has an internal short or disconnect? The wiring to the ECU is fine. I don't ask many questions but I'm pulling my hair out over this one.
-38 no matter what I change. Is this a problem? My donor is a Beretta 5spd a TGP and a few corsicas. I have parts.
thanks..
Anyway I run it at 160°, and once we were up and going it became clear why the 2.8 over heated, the fan refused to kick on. I had already put a brand new switch in below the thermo housing, before putting the new block in, fan still dead.
okay I went into wiring with my ohm meter. Beautiful ground, clear and concise according to the meter. went all the way into the ecu checking to make sure the switch had a clear path to the ECM. it did, I moved on. My guage works fine, it the temp sensor works. according to my datalog acquisition, the ECM again, sees the correct engine temp, but the SWITCH, reads -38 on the laptop.
But I changed the switch twice now, checked the wiring to no prevail! Still -38. Pulled my prom and told the ECM to leave the fan on at -38 so I can drive it without overheating, but as you can imagine it WAY over fuels, incredibly rich. Like 9 MPGs lol and I don't move it much to avoid engine anguish, I've spent to much on the motor.
Is it possible, the ECU itself has an internal short or disconnect? The wiring to the ECU is fine. I don't ask many questions but I'm pulling my hair out over this one.
-38 no matter what I change. Is this a problem? My donor is a Beretta 5spd a TGP and a few corsicas. I have parts.
thanks..