IDC going to zero
#1
IDC going to zero
Hey guys I've searched but can't seem to find anything similar to what is happening to me. It's a fresh build on the factory turbo and so far the guy tuning it has it idling like a dream but anything after 29% throttle the IDC drops to zero. It also seems to want pedal assistance to aid in the startup. Now the car isn't in front of me as my friend has it at his shop since he has more room for it but this is stumping us and the tuner.
It has a new Walbro 450 that we tested and it is getting the correct voltage and everything was installed correctly. I relocated the battery to the trunk with some 2 gauge wire but I'm not sure if this could be causing my problems or not. It originally had some high impedance FIC injectors in it for startup and was accidentally started multiple times without the resistor box bypass installed so could have this damaged something in my ECU? We are going to try swapping the ECU's next week with one my friend has waiting to go into his Evo but I figured I would ask you guys in the meantime in case there is something we could be missing. Other than that nothing was touched on the fuel system or electrical side of things. Any help would be appreciated.
Thanks,
Anthony
It has a new Walbro 450 that we tested and it is getting the correct voltage and everything was installed correctly. I relocated the battery to the trunk with some 2 gauge wire but I'm not sure if this could be causing my problems or not. It originally had some high impedance FIC injectors in it for startup and was accidentally started multiple times without the resistor box bypass installed so could have this damaged something in my ECU? We are going to try swapping the ECU's next week with one my friend has waiting to go into his Evo but I figured I would ask you guys in the meantime in case there is something we could be missing. Other than that nothing was touched on the fuel system or electrical side of things. Any help would be appreciated.
Thanks,
Anthony
#3
Appreciate the reply, I'm on the V7 ROM and I'll check the Fuel Cut Multiplier/Load as soon as I can get back to the car tomorrow hopefully.
I also forgot to mention that the car can barely get to 2500 rpms so I'm not sure what could be causing my issues right now.
I also forgot to mention that the car can barely get to 2500 rpms so I'm not sure what could be causing my issues right now.
#7
The car idles perfect but when you tap the throttle it goes lean as hell and if you keep your foot on the pedal it wants to die. I don't think it's the TPS either because it reads signal just fine on evosacan. Whoever tuned it before me though tried to adjust it to read 0% throttle but we fixed that right away. You can pretty much watch the IDC go to 0% as you give it throttle.
I keep thinking it must be a sensor or something in the tune because the symptoms don't really make me lean towards a faulty ECU. My friend does have a working OEM ECU that I could try swapping in if you guys think that could possibly rule some things out though.
EDIT: It's only throwing one minor code for air intake temp which I figured was because of the SD and scaling.
Last edited by abnt89; Nov 7, 2016 at 01:09 PM.
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#8
Evolved Member
By fuel pump losing pressure I meant the actual pump maybe be not fully seat up into the fuel pump hanger.
Im no tuning guru but maybe you should eliminate the iat code?
Im no tuning guru but maybe you should eliminate the iat code?
#9
EvoM Guru
iTrader: (1)
Sounds like SD wasn't properly implemented in the tune. Find a new tuner.
#10
Account Disabled
The pump will be to big for the regulator.
You'll know this once you check the fuel pressure at idle with the vac line both on and off.
But with modified cars there's always more than just 1 problem.
You can't actually tune it until the pressure is stable.
You'll know this once you check the fuel pressure at idle with the vac line both on and off.
But with modified cars there's always more than just 1 problem.
You can't actually tune it until the pressure is stable.
#11
Thanks for all the replies guys.
#14
Does this all sound more like a tuning issue or a mechanical one like something being installed wrong or needing to be replaced?
#15
EvoM Guru
iTrader: (1)
Go over the basic: Boost leak test. All sensors are plugged in. If you have an OMNI MAP sensor, replace it. They are known to go somewhat bad and cause issues, especially older ones.