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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 users over the course of many years.
If you have any questions, please feel free to email us.



Lincoln - Mercury
  Jim Grant's Tech Tips

93 GMC Jimmy, No Start After Tune-up
Q: My wife’s truck was running fine but was having a hard time starting. It’s a ‘93 GMC Jimmy w/ 4.3 Vortec V-6. I performed a standard tune up on it to include: cap and rotor, plugs and wires, ignition coil, fuel and air filters. Now I can't get it to start at all! I triple checked all connections, firing order, rotor placement even bought a new battery. No warning lights were present before tune up and no codes present when I performed the diagnostic check. I'm out of ideas, please save my dignity!...Tracy

A: Tracy did you think for one minute that I wouldn’t have a field day with your dilemma? Can I save your dignity? I wouldn’t want to be in your shoes when your mother-inlaw finds out what you did. My mother in-law’s frying pan can nail a guy at full run 200 yards outs. Gee, with this in mind I have to help. Did it occur to you that maybe you did just fine performing the tune-up? That the real problem fully manifested itself as you were performing the tune-up? Yea that’s it manifestation. First, check for spark at the coil. If present, is there spark at the end of the spark plug wires? If there is no spark, back up until you find what you missed. If there is spark then check the fuel system. If the fuel injection system on your vehicle uses an injector and popit valves. If the fuel pressure is too low, the popit valves will not open resulting in a no start condition. Guess what your vehicle starts like when the fuel pressure is marginal? Real hard. Spark, fuel and air in the right order and amount will make your GMC run. In the meantime, hide the small frying pans, they just can’t get the range as the big ones.

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