my 1989 f 150 4.9Litre 6 cylinder starts good when cold and after work, but after i run it for 30 min. or more and shut it off it takes twice as long to start. once it starts it shows black smoke for about 5-10 seconds then clears out and runs great. all filters are clean. air, fuel etc. have installed new egr sensor. plugs have 13k on them and new pump in front tank. problem exist on either tank. any help will be appreciated. thanks

 

Check for any trouble codes . There are a few sensors that control mixture , you are obviuosly experiencing a rich condition with the black smoke . Let us know what you find .

 

ichecked for codes and the only code i had was a 34 which was egr sensor which i replaced. however the code did not clear. i did disconect the battery for a few min. after installation. it only is rich for 5-10 seconds at warm start.

 

How many miles are on the engine?Have you checked the timing? It will make a differance when the engines hot and timing is off.Also have you checked your fuel pressure at the schrader valve in the fuel rail??

 

[font size="1" color="#FF0000"]LAST EDITED ON 11-Sep-00 AT 12:17 PM (EST)[/font][p]> How many miles are on
>the engine?Have you checked the
>timing? It will make a
>differance when the engines hot
>and timing is off.Also have
>you checked your fuel pressure
>at the schrader valve in
>the fuel rail??

 

the engine has 114k on it and the timing was right on. however i have not checked it in the last 13k miles i have not checked fuel pressure. i will do that and let you know thanks for the responce.