4efte swap in a Corolla E11 4efe

[frankieflowers77]

Hi guys.

i swapped the engine and there are issues to fix. Communication between dasboard and ECU/sensors like RPS signal, alternator doesn’charge, engine check light on. The car doesn’t start at first ignition. It need several cycles before it starts running. The problem happens only when you leave that car off for 24 hours. Any help?

[Red_Corolla]

You will need some diagnostic equipment to have an idea what the electrical issues are. For the starting issue, I would connect a pressure gauge to the fuel line and make sure you have good pressure from the first turn of the key. I don't know about your car, but sometimes there is a non-return valve in the fuel pump which can fail and then the line drains back into the tank overnight.

[frankieflowers77]

17 hours ago, Red_Corolla said:

You will need some diagnostic equipment to have an idea what the electrical issues are. For the starting issue, I would connect a pressure gauge to the fuel line and make sure you have good pressure from the first turn of the key. I don't know about your car, but sometimes there is a non-return valve in the fuel pump which can fail and then the line drains back into the tank overnight.

Thank you. I think that is the issue because it happens only at the first start. I will try to figure it out and I will change the fuel pump that I bought for the new engine. It’s a WalBro 255 LPH.

[frankieflowers77]

23 hours ago, Red_Corolla said:

You will need some diagnostic equipment to have an idea what the electrical issues are. For the starting issue, I would connect a pressure gauge to the fuel line and make sure you have good pressure from the first turn of the key. I don't know about your car, but sometimes there is a non-return valve in the fuel pump which can fail and then the line drains back into the tank overnight.

Does the charcoal pirge canoster regulate (eith the vacuum pipes conneted) the return fuel pressure? It seemes that the car doesn’t start immediately in the morning without it. Probably because the fuel pressure goes down without it?

[Red_Corolla]

6 hours ago, frankieflowers77 said:

Does the charcoal pirge canoster regulate (eith the vacuum pipes conneted) the return fuel pressure? It seemes that the car doesn’t start immediately in the morning without it. Probably because the fuel pressure goes down without it?

No, but it could be the cause of your issue. The system collects fuel vapour from the tank and vents it into the intake to be burned by the engine. The venting is controlled by the ECU using solenoids and a pressure sensor inside the tank. If the solenoid is stuck open, it can be the same as having a vacuum leak. Do some research on how Evap systems work.

[frankieflowers77]

On 9/13/2021 at 2:21 AM, Red_Corolla said:

No, but it could be the cause of your issue. The system collects fuel vapour from the tank and vents it into the intake to be burned by the engine. The venting is controlled by the ECU using solenoids and a pressure sensor inside the tank. If the solenoid is stuck open, it can be the same as having a vacuum leak. Do some research on how Evap systems work.

I will change the furl pump and see if it solves the problem. I did put the canister back with it’s pipes bit it still has lack of pressure at first atart. Thanks