Answer

 

Hi there,

 

Before changing anything else, I would suggest getting a compression test done.

 

For code P1310, there are different codes and using the onboard diagnostic Unit would get a more accurate code.

 

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Volvo Self-Diagnostic System

 

System is capable of self-diagnostic functions through the use of Volvo diagnostic unit in engine compartment. System has 3 test modes. Test mode No. 1 is used to display and erase codes. Test mode No. 2 is used to verify operation of system components. Test mode No. 3 operates components in a certain order. Access to diagnostic system is provided by socket No. 2 on diagnostic unit with ignition on.

 

CAUTION: After displaying DTCs, ignition must be switched off BEFORE engine is started.

 

Test Mode No. 1 (Displaying Codes)

1. To retrieve codes, open Volvo diagnostic unit cover (located in right corner of engine compartment) and connect test lead to socket No. 2. Turn ignition on. Enter test mode No. 1 by pressing test button once for 1-3 seconds.

 

2. Observe LED, and count number of flashes in 3 digit series comprising a fault code. Because series are displayed at 3-second intervals, codes can be easily distinguished.

 

3. If a fault code is retrieved, note it down. Depress push button again, and check for additional codes. Depress push button a third time if necessary. If first code repeats, no other codes are present.

 

Test Mode No. 1 (Erasing Codes)

 

1. Codes can be erased only after all DTCs have been displayed and first DTC has been repeated at least once. To erase DTC, turn ignition on. Press test button on Volvo diagnostic unit and hold for more than 5 seconds. Wait for LED response.

 

2. Press button again and hold for more than 5 seconds. Turn ignition off and on. Start engine. All DTCs will be erased and all adaptive values reset.