FD3S Strange Overheating after injector change
01-24-17, 06:26 AM
#1
Junior Member
Thread Starter
FD3S Strange Overheating after injector change
Hi Group, I have recently upgraded injectors on my single turbo FD3S from the stock 550/850 to end fed Siemens 110324 (850cc) Primaries and Bosch 0280 150 846 (1600cc) Secondaries... And now the engine struggles to keep cool where previously this was never a problem.
Whilst I had the UIM off I re-wired the crispy wiring, removed the OMP, blocked the OMP injectors and run 100:1 premix and removed the secondary butterflies and the water hoses to the throttle body.
I joined the water feed from the secondary Iron to the nipple on the thermostat housing and bled the cooling system so as to keep coolant flow as similar as before
I run an Adaptronic Select ECU and changed the injector settings from 550 to 850 and 850 to 1600 to suit the new injectors. I have not as yet adjusted the ECU with the new injector dead times, leaving the "Stock" factory injector settings intact.
After running the car for the first time it ran considerably hotter than previously and started chucking out coolant. ECU was logged at 122 deg C coolant temp.
I found an open circuit MAT sensor which was open circuit. I remedied this and refilled the engine and also checked for potential water seal failure. (No exhaust steam, No bubbles in the coolant when cold, no water in oil and the engine sucks back displaced water from the reservoir.
I run an innovate wideband and this is at 14.7 AFR at idle, buy the engine still runs considerably hotter than previously. I run a 3 core alloy radiator and the fans are working much harder to keep the engine at 85c.. Fans on at 87 and off at 85c. When the engine is left to cool overnight coolant is returned from the overflow to the engine which suggests a good vaccum. and or the cooling system is not being pressurised?
PLEASE NOTE *** I have never had any cooling problems prior to fitting the new injectors to the engine and apart from re-wiring and re-terminating the wiring loom including injectors, crank angle sensors and temp sensors, new fuel rail and injectors, changing injector sizing in the ECU, nothing else has changed. I am at a loss to as why I now have a cooling problem.
Could I have rewired a CAS incorrectly and the engine is running retarded? Ironically the engine appears to idle fine and displays a good AFR.
I am rather lost for ideas and would appreciate any suggestions on where to go from here.
Many thanks and thanks for reading :-)
Whilst I had the UIM off I re-wired the crispy wiring, removed the OMP, blocked the OMP injectors and run 100:1 premix and removed the secondary butterflies and the water hoses to the throttle body.
I joined the water feed from the secondary Iron to the nipple on the thermostat housing and bled the cooling system so as to keep coolant flow as similar as before
I run an Adaptronic Select ECU and changed the injector settings from 550 to 850 and 850 to 1600 to suit the new injectors. I have not as yet adjusted the ECU with the new injector dead times, leaving the "Stock" factory injector settings intact.
After running the car for the first time it ran considerably hotter than previously and started chucking out coolant. ECU was logged at 122 deg C coolant temp.
I found an open circuit MAT sensor which was open circuit. I remedied this and refilled the engine and also checked for potential water seal failure. (No exhaust steam, No bubbles in the coolant when cold, no water in oil and the engine sucks back displaced water from the reservoir.
I run an innovate wideband and this is at 14.7 AFR at idle, buy the engine still runs considerably hotter than previously. I run a 3 core alloy radiator and the fans are working much harder to keep the engine at 85c.. Fans on at 87 and off at 85c. When the engine is left to cool overnight coolant is returned from the overflow to the engine which suggests a good vaccum. and or the cooling system is not being pressurised?
PLEASE NOTE *** I have never had any cooling problems prior to fitting the new injectors to the engine and apart from re-wiring and re-terminating the wiring loom including injectors, crank angle sensors and temp sensors, new fuel rail and injectors, changing injector sizing in the ECU, nothing else has changed. I am at a loss to as why I now have a cooling problem.
Could I have rewired a CAS incorrectly and the engine is running retarded? Ironically the engine appears to idle fine and displays a good AFR.
I am rather lost for ideas and would appreciate any suggestions on where to go from here.
Many thanks and thanks for reading :-)
01-24-17, 09:36 AM
#2
Off hand , I'd suspect air in the system and/or check the t-stat. What ratio coolant to water are you running? 122 C. is pretty hot. About 115 C. is where you have to start worrying about coolant seal damage.
What is ambient? Are you moving when seeing these temps or stationary? Is the under-tray in place?
What is ambient? Are you moving when seeing these temps or stationary? Is the under-tray in place?
01-24-17, 12:39 PM
#3
Aside from the overheating, does the car run pretty good?
If the cooling system is working correctly and has been bled correctly, then I would next look to make sure your coolant hoses are not kinked and the radiator is free of any obstruction.
Do the cooling fans come on? You could have potentially damaged the thermoswitch while under there
If the cooling system is working correctly and has been bled correctly, then I would next look to make sure your coolant hoses are not kinked and the radiator is free of any obstruction.
Do the cooling fans come on? You could have potentially damaged the thermoswitch while under there
01-24-17, 04:49 PM
#4
Junior Member
Thread Starter
Hi there, I should have mentioned that the car is still in the workshop and has not moved yet since the injector upgrade. Apart from re-routing the throttle body coolant lines and re-filling the coolant, the cooling system has not changed. Radiotor fans come on as per normal.Coolant is de-mineralised water with 30% antifreeze.
Hopefully it is a CAS that I have wired up the wrong way that is causing the engine to run retarded. I am planning on locking the ECU to TDC and checking the timing marks with a timing light as I am hoping the overheating are sysmptoms of an engine with too much retard.
Hopefully it is a CAS that I have wired up the wrong way that is causing the engine to run retarded. I am planning on locking the ECU to TDC and checking the timing marks with a timing light as I am hoping the overheating are sysmptoms of an engine with too much retard.
