Allantés with 4.5 liter engines have potting material used in their fuel injector coils that ethanol in the fuel supply seems to attack. Over time, the coil resistance drops, and the injector ceases to function. The bad coils can also cause an engine computer module problem. Only the 4.5 liter injectors of the 1989 through 1992 Allantés seem to be affected by the

ethanol. The 4.1 liter engine on the 1987 and 1988 Allantés uses a different fuel injector, as does the 1993 Northstar.

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When we first started seeing the failures on the 4.5 liter engine fuel injectors a couple of years ago, we replaced just the injector that had failed. As the problem escalated, we made harness adapters so we could quickly check the condition of the injector coils. A good injector coil will have 12.5 ohms resistance. So we started using the arbitrary value of 9 to 10 ohms as a threshold for a minimum acceptable value. Any injector coil less than nine ohms would be replaced.

Tools for the job

After a while, we realized that anything less than 12.5 ohms showed the injector had already started to fail. In one of my

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own Allantés, we had installed a set of reconditioned original injectors that were tested and were found to be at 12.5 ohms

resistance. About six months later, running problems started to show up again. We retested and were surprised to find that three of the 'good' ones had already failed. At that point, we knew we needed to find other injectors. We now have a

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type of new aftermarket injector and also a reconditioned injector we have been using for over a year with zero subsequent failures. This trial and error process, done

in our own Allantés, got us to this point.