Wont Idle when HOT
Posted: Sun Sep 22, 2019 12:08 pm
A conundrum for you. Car drives, generally pulls like a train but hunts around like a baddun at 1800rpm (all gears). Idles okay when cold, actually idles quite nicely. But it won't idle when hot. Specifically revs will drop to about 600rpm (indicated) and the battery low light will flash, then sometimes it will flare back up to 1200rpm then start to settle out till it hits 600rpm. Sometimes it will just stall.
Have pulled the connection to each injector and this seems to make things worse (which I take as good, injectors are working, wiring is working). Have pulled the Coolant Temperature Sensor (CTS) which triggers the MIL but makes not difference. I've measures across the CTS and got 280Ohms which based on the table below suggests a good reading.
I've just repaired/replaced the ignition harness (ECU to Amp to Ignition Coil) so I guess it could be this, but having checked it electrically the wiring is sound, resistances low and good supply to the coil etc I noticed there is a small crack in the potting on the top of the coil (Ducellier), but going by the dirt that's in it, its been that way for a long long time.
So, suggestions?
Have pulled the connection to each injector and this seems to make things worse (which I take as good, injectors are working, wiring is working). Have pulled the Coolant Temperature Sensor (CTS) which triggers the MIL but makes not difference. I've measures across the CTS and got 280Ohms which based on the table below suggests a good reading.
I've just repaired/replaced the ignition harness (ECU to Amp to Ignition Coil) so I guess it could be this, but having checked it electrically the wiring is sound, resistances low and good supply to the coil etc I noticed there is a small crack in the potting on the top of the coil (Ducellier), but going by the dirt that's in it, its been that way for a long long time.
So, suggestions?