How do I find the problem


Asked by Mar 29, 2015 at 07:07 PM about the 1990 Ford F-250 2 Dr XLT Lariat Standard Cab LB

Question type: Maintenance & Repair

My 90 f250 will start but will not idle.

1 Answer


The most common on these Fords was the ISC unit, they either got dirty and the port wouldn't open or the DC motor just failed, pull it off, clean the ports on the valve and manifold, put it back on and then check to see if it idles, if not, then try pulling the codes to see if something else is causing the problem.

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