Shudders when accelerating from full stop

2015 SUBARU CROSSTREK
74,000 MILES • 2.0L • 4 CYL • 4WD • AUTOMATIC
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LEONRAH
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I have a Subaru xv 2.0i 2015 CVT. Converted to LPG.

The car is jerking when moving from a full stop.

If I disconnect the battery and reconnect it drives perfect for a day or so.

And then it's jerking again when its about 1,500 rpm and moving from a full stop.

When is write jerking (shudders) I mean the car is jumping.

I did the throttle relearn. And it's the same.

I can not figure this one out and neither the garage.

May one of the computers in the car cannot calibrate itself that which one?

I replaced the CVT ECU and it did not help.
tested the camshaft sensors and got 5v from them when no metal near them when putting a metal its drops to 0v. remove the metal again it stays at 0v putting back metal it goes up to 5v... so I think its the camshaft sensors but didn't yet replace them as they are pricey $300.00 for a unit and this car have 4 of them.
Aug 23, 2019 at 7:26 AM
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JACOBANDNICKOLAS
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Welcome to 2CarPros.

If the camshaft sensors are causing the issue, the check engine light should be on with a specific trouble code indicating which sensor is bad. Has the check engine light been on while the engine is running? Has it blinked on and off with the engine running?

Let me know.

JOe
Aug 24, 2019 at 8:35 PM
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LEONRAH
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No check engine lights at all. Scanned with launch. No codes.
Aug 24, 2019 at 8:39 PM
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JACOBANDNICKOLAS
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Welcome back:
The one thing that I can think of that may or may not set the check engine light is crankshaft position sensor. Take a look through this link. I realize the vehicle isn't stalling, but it can cause a miss.

https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

Let me know.

Joe

Aug 24, 2019 at 10:27 PM
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LEONRAH
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I will take a look at them. thank you
Aug 25, 2019 at 7:37 AM
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JACOBANDNICKOLAS
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Welcome back:

You are welcome. Let me know what you find or if you have other questions.

Take care,
Joe
Aug 25, 2019 at 7:30 PM