99 explorer misfire when cold

multiple misfire and both banks lean codes. Runs crappy only when cold

Welcome to the forum!

Have you done anything to attempt to resolve this? Which engine does your Explorer have? When was the last time a tune up was performed?

-Rod

At this time All I know it is a V6 and the tune up is about a year old but the plugs look good. Have not ohmed the plug wires yet. We are not getting the correct voltage at the map sensor from the harness. Any help would be fantastic...........

Under your hood it will say 4.0 SOHC on a plastic piece usually and the 4.0 OHV looks like this http://img74.imageshack.us/img74/574/xpic2sn4.jpg

It's my sons car and I won't be able to contact him till later. As soon as I find out which one it is I will pass it on. I am very interested in your input and appreciate everyones help.....Thankyou

At this time All I know it is a V6 and the tune up is about a year old but the plugs look good. Have not ohmed the plug wires yet. We are not getting the correct voltage at the map sensor from the harness. Any help would be fantastic...........

The MAP sensor has 6 wires to it, right? On the Red wire you don't have battery voltage, or are you referring to one of the other wires not having the correct voltage?

The Red wire to the MAP shares its feed with a lot of other components, including the fuel injectors, fuel pump relay coil, oxygen sensor heaters, PCM, and Idle Air Control.

-Rod

Thanks for all your help!! After reading other posts our problem is in the intake gasket. We used propane to search the leak out. where it didnot show up before (because the engine was warm) it leak was found and is currently being repaired. Again thanks for all the help................

No Problem Anytime, We Try To Help As Best As We Can. :)