Hello,

I have a 1992 e-150, 4.9L with E0D4 trans. cc is factory.

I just realized that the cc does not work.

But how do you troubleshoot a cc problem. All fuses "in cabin and under hood" are ok, horn and lights, wipers, fan and other accessory are all working properly and we do not detect "hear" a vacuum leak. <O



What next???
<Othanks

 

I'm in a similar situation with my 302 EFI.

First, check/replace all of the vacuum lines. Then make sure the CC vacuum solenoid holds vacuum.

Get the factory EVAC diagnostic manual. I bought one off Ebay. Now if only I had the time to use it...