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Jim Grant Tech Tips Jim Grant Tech Tips
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 Chevy Blazer, Running Lean

Q: My son has a '93 S-10 blazer Vin W, Runs lean after warming up. The entire primary and secondary electrical system has been replaced, as well as TPS and MAP sensors. I have cleaned all the grounds and swapped in a different ECM. We also put in a new Spider assembly because we thought the injectors were plugged after he replaced the fuel pump. The problem started the day after he replaced the fuel pump and filter. I am also an ASE master tech, but I work in a government fleet operation, so I have expended my experience on this one.

A: I would first suggest checking the fuel pressure cold, warm and while being driven. The pressure should be between 55 & 61 PSI, if the pressure starts to drop below 55 PSI there is a problem with the fuel supply, pump, filter lines, etc.. If the fuel pressure stays within the limits, under all of the conditions, then the engine should be checked for vacuum leaks or incorrectly routed vacuum lines. If no problem is found then you have to start looking closely at the information the computer is reporting. If the fuel trim/adjustment information reported shows enrichment yet the engine is still running lean then go back to checking for vacuum leaks. Oh yes, don't forget that the set timing connector has to be disconnected to correctly set ignition timing on this vehicle. Also check the condition of the distributor. A worn distributor shaft or bushings will cause the tach signal to the vehicle's computer to be off. This can result in a fuel control issue, due to the computer needing that information to control the injector pulse.

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