Having problems with your 1999 Ford Expedition ?

Miss firing codes 303 and 308 persist after coil replacement..... Possible wiring issue or is there a ignition control module that will cause this issue???

Posted / edited by AnonymousUser on : 11-02-2019

Answers :

Check for engine vacuum leaks (common cause of lean O2 codes) around the intake, use a bottle of propane with a hose spray around the whole intake, all vacuum lines etc. if the idle speed changes u have a leak. Let me know what u find. Also clear the codes u have.
\015\012There must have been a problem with the wiring of the car.
\015\012Have it carefully rewired and the problem would be solved.
\015\012Take care
Repair Help & Product Troubleshooting for 1999 Ford Expedition

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