Question about 2002 Jeep Grand Cherokee

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Starting problem. Is it the key lock cylinder, fuel pump...?? YIKES!

Hey mike, I just thought of something. When it does start, after a drive to the grocery store...it always starts first time. However, I tried to start it today with no luck at all! Does this "flat spot" progressively get worse? and after I drive it and the starter is not "stuck in the flat spot"....does that explain why it starts after a drive?? Thanks for your time and effort

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  • Ladd Aug 23, 2008

    thank you for all your help mike. I will let you know what happens.
    :)

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Hello again,

Think of a 'flat spot' as Starter Roulette. When the starter is finished turning the engine over, it spins down and comes to a stop. Random. There is a position where the contacts are worn down (presumably). If it happens to stop in this position - trouble.

You say it always starts when warm? Instead of a starter problem, it may be the Solenoid. You still need to remove the starter to get to it (its attached). But it's a lot cheaper to replace.

What the Solenoid does: It's an electro magnet. It's an electric switch. A very high amperage electromagnetic switch. The current needed by your starter when turning over the engine would melt (fry, smoke, burn, etc) your ignition switch. So instead, the start position on the key flips an electric switch that can handle it. Inside the solenoid, there is a rod or piston on a spring. The end of this rod has a disk with a conductive coating. When the electromagnet is on (Start) the rod moves against the spring. There are heavy contacts that connect to the Starter and the battery. Turn your key to Start and you hear a CLICK. That is the solenoid. The magnet activates, the rod moves, makes connects the battery and starter motor contacts, starter spins.

These internal contacts can get burned too. That conductive disk can spin. It can have a 'flat spot'.

To tell the truth, there shouldn't be a difference. Most of the time, heat makes things run worse, not better.

And yes, it will get worse.
Let me know what you plan to do.
Mike


Posted on Aug 23, 2008

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