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A collection of helpful articles based on reader submissions
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Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by ALLDATAdiy.com users over the course of many years.
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  Jim Grant's Tech Tips

'98 Chevy Blazer, Shuts Itself Off

Q: My ‘98 Chevy Blazer will shut itself off with little or no warning. “It simply dies”. Doesn't matter whether you are driving on the highway (higher speeds) or in stop and go city driving. It will start right back up again after the switch has been turned off, however the cruise control will no longer function unless you are able to place the vehicle in park before trying to restart. Before dying, you feel a sudden loss of power. The check engine light does not usually come on during this time. When it does, and the system has been put on diagnostics, it simply says that the engine was "missing". What could be the cause of this malfunction? PS; This does not happen every day. It could happen once and then not reoccur for another week or so. It has been happening off and on since the middle of June.

- Michael W.

A: Do you want to see some real funky facial expressions? Just watch a tech’s face when the caller on the phone says the problem doesn’t happen every day or all the time. Intermittent problems like the one you’re describing can be and often are hell to diagnose. I did find one thing interesting though. You stated that the cruise control stops working until the vehicle is turned off and put in park after this problem occurs. The cruise control system on your vehicle works with the vehicle’s computer. They are connected and share information. Might I suggest unplugging the cruise control module and driving the vehicle to see if the condition/problem goes away. It is just a thought. Other wise I would suggest checking the computer grounds and connecters for a possible bad connection, corrosion or even signs of water entry. The problem with sporadic problems like yours is they never break or act-up when the tech is in the vehicle or with diagnostic equipment connected. I would suggest closely watching for related operating conditions that might be bringing the trouble on. Often times there is something else occurring that brings the problem out. That little piece of information can lead to diagnosis of intermittent stalling problem like yours.

 
     
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