I'm not sure if anyone has this problem.

Bone stock 20v Blacktop. Cold morning start easy like a charm. But when its warmed up, it needs to be cranked 1-2 seconds before it starts. Other than that, engine runs well. I have tried changing 255lph fuel pump but didn't solve it. Anyone can share some advice?

IAT sensor ok and mounted either in an intake plenum or near the inlets of the ITBs?

gotzoom? wrote:IAT sensor ok and mounted either in an intake plenum or near the inlets of the ITBs?

Yes. But how to check if it's not OK?

One respected tuner told me to change the crank sensor to a 4g93

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There is no crank angle sensor on any variation of 4AGE. The factory service manual has the test procedure for the IAT sensor. The ECU uses the IAT temp reading to adjust the fuel mixture, so if it is not reading the same temp as the air entering the throttles, the engine isn't going to run correctly.

gotzoom? wrote:There is no crank angle sensor on any variation of 4AGE. The factory service manual has the test procedure for the IAT sensor. The ECU uses the IAT temp reading to adjust the fuel mixture, so if it is not reading the same temp as the air entering the throttles, the engine isn't going to run correctly.

IAT sensor, I unplugged it and there is no CEL. I will run a diagnosis.

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Will it start quickly if the throttle is held 1/3-2/3 open?

allencr wrote:Will it start quickly if the throttle is held 1/3-2/3 open?

It won't.

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allencr wrote:Will it start quickly if the throttle is held 1/3-2/3 open?

Maybe just a little effect. Minor