rich fuel mixture

[murph]

My Bronco is running very rich. Everyone tells me to adjust the mixture but I can't find the procedures in the manual. Its a 91 with a 351W. Any help?

 

[Bully Bob]

"Everyone tells me to adjust the mixture"

This may help a rich idle.....? You prob. have needle & seat, or float issues if runn'n rich off idle. /emoticons/[email protected] 2x" width="20" height="20" />

 

[BLADE262US]

Wait Wait Wait you have a 91 with a carb ? Im not thinking so unless you or someone else has changed the intake and went to a carb system . If you fuel injection system is running rich there is a couple things you can check . Make sure the fuel presure is not too high , The coolant temp sensor may be bad telling the EEC that the motor is cold all the time , When was the last time you changed the air filter ? Have you ran any type of injector cleaner through it ( may have an injector hanging open ) If its fuel injected like its suposed to be try that stuff /emoticons/[email protected] 2x" width="20" height="20" />

 

[murph]

It's fuel injected. I'm dropping in a 302 in a couple months.

 

[ocalabronco]

also check your 02 sensors. those can send a bad reading to the comp, causing it to create a rich idling enviroment