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AWD - No or Slow Crank with Hot Engine

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No or Slow Crank with Hot Engine V70-XC70 2000

I've had some poor cranking problems on my V70. I have had the starter/solenoid replaced and also the P-N-P switch.

Now it starts perfectly every time when cold and runs great cold or warm.

Only issue is once hot, it sometimes won't crank at all or if I let it cool a little bit it will crack really slowly and eventually start.

I know the battery is not the issue because it starts cold every morning with no issue and is only two years old. I could take it to an indy to load test the battery just to rule it out for sure.

Wondering what else could be the issue? Sounds electrical related.





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    No or Slow Crank with Hot Engine V70-XC70 2000

    Getting here late, but I think you should measure voltage drops on all connections between the battery and the starter (and the B+ line to the fuse box too). Compare the voltages to what you measure at the big red wire on the back of the alternator. The 2000 model year cars are particularly prone to corrosion problems in the positive cable, and as others have noted, they get really hot.

    The positive cable is a pain to replace if you route it the original way, where it passes through some kind of cable tray near the bottom of the engine compartment. I routed mine outside it, but covered it with wire loom covers. Some of the aftermarket replacement cables are very dodgy quality, but the Volvo ones are outrageously priced. You may be able to find a cable that is sufficiently long with a stud on it for the B+ connection, which has a 10 mm stud and nut on it.

    Good luck!





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      Question about resistive starter cable ends/crimps V70-XC70 2000

      Hi Herb,

      Good suggestions. I wonder if corroded crimp connectors in the starter/battery harness can reveal their voltage drop with an IR thermometer? If the cable crimps/ends are resistive and cause the starter to lug, they should get very hot at the resistance.

      Bill





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        Question about resistive starter cable ends/crimps V70-XC70 2000

        Hi Bill:

        I am pretty sure you could diagnose with an IR thermometer-- when my cable was bad you could feel it by touch easily. Some people have had luck re-soldering and shrink wrapping the original cables.





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    No or Slow Crank with Hot Engine V70-XC70 2000

    Starters can suffer from - heat soak - which causes them not to operate.

    To check for heat soak, pour cold water on the starter to cool it off the next time the problem occurs. If you can then start the car, this is your problem.

    You may need to make up a funnel and hose to cool the starter.

    I think that this problem has been discussed in the RWD section a number of times.





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    No or Slow Crank with Hot Engine V70-XC70 2000

    Sounds like a red wire problem. The wire going to the starter is probably down to one strand of copper at the battery connection.
    --
    Keeping it running is better than buying new





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    No or Slow Crank with Hot Engine V70-XC70 2000

    Not with a Volvo, but have had similar experiences on vintage cars with 6 volt systems. Weaknesses in electrical systems are exposed early when running only 6V.

    Two main starting culprits I've experienced in my 6V cars:

    1. Starter drag. When the starter end shaft bearings are worn/out-of-spec, the starter armature will "rock" out of its normal aligned position just enough to drag on the field coil when cranking. More pronounced when motor is hot. Will barely crank, if at all. Cranks normally when cold. Some rebuilt/reman starters are better quality than others, with all components inspected and replaced when out of spec.

    2. Connections & Grounds. Particularly with the heavy cables. If corrosion or poor connections are present, high resistance in the circuit shows itself when the motor is hot. Good to check all connections. If the cables are very hot to the touch, there's a problem.





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      No or Slow Crank with Hot Engine V70-XC70 2000

      Agreed: Check grounds, cables/wires and all connections for damage, tightness and corrosion.
      --
      Will I buy another Volvo??? We'll see....





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    No or Slow Crank with Hot Engine V70-XC70 2000

    Checking your battery's condition as well as the connections is "a great place to start".
    A cheaper battery losing its oomph at 2 years of age isn't unheard of.

    How long ago was the starter replaced? .....by a good mechanic?
    When the starter engages does it sound the same as it always had? I'm thinking of my youth when a starter could be mounted such that the small gear could "jam against" the torque converter's gear ring.
    --
    Our 3rd V70





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