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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

'90 Lincoln Continental, Fuel Injector Problems

Q: I have a ‘90 Lincoln that won't start. The fuel injectors are not getting any power to open, so the fuel will not go through. The fuel pump turns on for about 15 seconds and shuts off. I checked the grounds and tested each injector-they’re fine. Can you help?

A: Are you sure the fuel injectors are not getting any electrical power? When the ignition is turned on, with an electrical connector for the fuel injector unplugged, there will be battery voltage present at the red wire of the fuel injection connector. The other wire, goes to the vehicle’s computer which controls the operation of the fuel injector. There is a component called an Integrated Control Relay Module (ICRM) that is mounted on the driver’s side of the radiator under a plastic shield. The power supply for the fuel injectors is controlled by this module. The fuel pump is also activated by this module. Because you say the fuel pump is functioning then one would be led to believe that the power supply (fuse) to the ICRM is good. You’ll have to check the wire coming from the ICRM to the fuel injectors. If there is electrical power coming out of the ICRM but is not getting to the fuel injectors, then there is a break in the wiring that will have to be repaired. If there is no electrical power coming from the ICRM to the fuel injectors than it is likely the ICRM will have to be replaced. To save on cost of the replacement part you may check with a salvage yard for a replacement.

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