Stalling, bucking, and Drivability issues at operating temperatures

[2023Mach1]

The bap and it's controller have long since been removed, ya?

How smart is the fuel pump? Does it not detect pressure on its own? Or is it a dumb device that the ECU must command on/off for flow and pressure?

BAP was removed. All back to stock connections.

I think it’s a dumb pump commanded by the ECU…

Pressure at the lift (I’m assuming that’s the low side pressure) was very close to matching.
But rail pressure was way off.

check my screenshot out above.

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[2023Mach1]

Curious if maybe one of the coil packs are bad.

I have not done a tune up yet but the only thing that points me away from that is the fact that it runs perfect in open loop. (Before sensors are used)

 

[K4fxd]

I have not done a tune up yet but the only thing that points me away from that is the fact that it runs perfect in open loop. (Before sensors are used)

These cars only run open loop for about 15 seconds when first started. Not enough time to say if it is running perfect or not.

 

[2023Mach1]

These cars only run open loop for about 15 seconds when first started. Not enough time to say if it is running perfect or not.

Hmmm… mine seems to run OL until it’s warm.

 

[Pistol_91]

Like K4 said. They should only be in OL for seconds. Not minutes while your car warms up

 

[K4fxd]

Hmmm… mine seems to run OL until it’s warm.

That shouldn't be, once the widebands heat up these cars go into closed loop.

 

[2023Mach1]

Like K4 said. They should only be in OL for seconds. Not minutes while your car warms up

That makes since. My car keeps dropping the CL- normal when the pressure gets to high so it seems to be doing it as protection to the engine.

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