1992 300E 3.0L Has Check Engine Light on and when i hold the button down on the Diagnostic Box for three seconds and release it Flashes 18 times. What is that code please or what is the problem? Plus i know that its time for a new IAC Valve, ive clean ed it twice and it runs a little smoother everytime after i clean it. HELP! Thanks

 

You need a garage with the diagnostic machine to find exactly what it is... im sorry i cant give you an answer on your car ;(