What could be wrong with code_p0305_for_1998_Volvo_XC_turbo

code is for misfire on cylinder 4 , may just need the plug cleaning or may need a new coil pack , plug lead , or more advanced diagnostics to get to the exact cause

leak in the exhaust manifold

It should be clipped onto the air filter housing

This sounds like a problem with the ETM or electronic throttle module. You need to have someone with Volvo experience scan the engine management system for fault codes. Most likely you will have codes for the throttle module. This was a very common problem with 99 and newer cars. Volvo extended the warranty on the modules to 100K on the early ones. Still have issues occasionally with the later ones-just a poor design of the sensors for throttle position in the module.

The 1st things you need to do is have the engine control module scanned for fault codes and the fuel pressure tested for proper specs.

DTC P1014 - B Camshaft Position - Timing Over-Advanced or System Performance (Bank 1).
At engine start-up the control module checks that the camshaft is in the correct position in relation to the crankshaft. Diagnostic trouble code (DTC) ECM-62 is stored if the control module detects the camshaft in an incorrect position on start up.

Possible source:
Camshaft cogs incorrectly seated
Incorrectly installed camshaft pulley
Contact resistance in the terminals.

Condition:
Malfunction indicator lamp (MIL) lit
The engine misfires.



DTC P1237 - Turbo Control Valve
Looks like the turbo is not producing enough boost. Check the waste gate hoses and the waste gate itself to see if its bound up. If the waste gate is working right, I would suspect a bad turbo.

This is an advanced level repair. You may want to have Volvo do the diagnostics on this one. Your code is for low turbo boost pressure. The waste gate is a big silver actuator on the turbo. It has vacuum hoses going to it. See if they are all hooked up. Also see if you can move the lever that the actuator pushes on. If its jammed that may be your problem.


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DTC P0305 Code - Cylinder #5 Misfire Detected
A P0305 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #5.

Symptoms may include the engine may be harder to start, the engine may stumble / stumble, and/or hesitate or other symptoms may also be present. Other tips to solve it in the previous fault code link.

A code P0305 may mean that one or more of the following has happened:
Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression
Defective computer

Hope this helps and just keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa.

This shouldn't be a problem. I can't seem to send diagrams through this forum so please email me at [email protected] and please include the engine size and whether it is turbo or non turbo.

Check the chassey grounds, by the battery, starter and transmission. Clean the ground straps, removing where they connect to the car, wire brush these areas... any that you see, even check by the fuse box and computer. Reconnect and be sure so clean the battery posts too. Always remove the negative terminal first and install last. Be sure you have your radio code before removing the battery terminal cables to clean those.