I have an 01 Grand Cherokee Limited. Sometimes when you turn the key there is nothing. Gauges work, everything else works.Sometimes if you keep trying, all of a sudden it will start. It may start good for a month then it does it again. Sometimes I just hold the key in the start position for a minute or so and it will start. Had the battery load checked and it was fine. Battery connections were cleaned an tightened...??????
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Re: Won't start sometimes
Hmm, sounds like starter. Next time it will not start, don't hold the key for almost a minute. Try turning the key several times if no luck, grabb a hammer and LIGHTLY tap on starter. If it turns over normally then, starter is going out.
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This is a normal condition I will explain why. Your vehicle has an ETC(Electronic throttle conrtol) which mean the is not a throttle cable. It is control by onboard computers in the vehicle. There is a delay sometimes because the ETC performs whats called a sweep test. turn the key to the on position for 2 seconds for it will then fire right up. I hope this info was helpfull please rate it.
Bases on the limited info provided, most likely the ignition switch. If you list the symptoms you experience when it doesn't start it would be easier to diagnose your problem for example: does it crank? does the key turn and do nothing? etc. Hope this answers your question.
Poor grounding can cause many of the conditions you have listed. When checking power with a volt meter, this goes unnoticed because the meter does not draw enough amperage to cause the bad connection to break contact. Your battery is grounded to the engine block and also has a small lead to the fender. Many components have individual ground leads as well (including most computers) I would check all ground leads and clean the contact surfaces with sandpaper or a wire brush. Adding an additional ground wire is a good idea as well. Don't forget that the dash board frame must also provide a good ground as well. Many times this is all you need to do...sometimes though, control modules can be damaged because in having a partial ground, they build up heat, due to additional resistance in the circut. This may or may not cure your problem, but it's worth checking out. Grounding is often overlooked, especially if it has not completely broken down.