AZmoto
Well-Known Member
I have a brand new ATK LNF engine with a new engine harness. The first few times I started the engine it cranked right up and idled fine. The other day when I went to put it on the trailer for the DMV inspection it wouldn't start. After about the 3rd or 4th time cranking I would get a mild backfire. If I give it a shot of starting fluid in the air filter it starts and runs fine. It will also start again on its own once it's warmed up.
I pulled the codes and got one for fuel tank pressure voltage and another for the EVAP system. After some experimenting I found that the engine will start from cold with the EVAP unplugged. The line on the EVAP solenoid is capped but I've tried it both ways and it doesn't make a difference. I've disabled all of the EVAP functions in HPTuners but that only seems to affect the actual CEL and not whether it runs the self diagnostics.
So right now I can only cold start the car with the EVAP unplugged. I can plug it back in after it starts and it's okay. It seems like the ECM is changing it's starting parameters based on whether it detects the EVAP solenoid. Has anyone else run into this?
I pulled the codes and got one for fuel tank pressure voltage and another for the EVAP system. After some experimenting I found that the engine will start from cold with the EVAP unplugged. The line on the EVAP solenoid is capped but I've tried it both ways and it doesn't make a difference. I've disabled all of the EVAP functions in HPTuners but that only seems to affect the actual CEL and not whether it runs the self diagnostics.
So right now I can only cold start the car with the EVAP unplugged. I can plug it back in after it starts and it's okay. It seems like the ECM is changing it's starting parameters based on whether it detects the EVAP solenoid. Has anyone else run into this?