89 bronco 4.9 liter 6 cylinder idle problem

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smokeysbronco

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My 89 bronco is running rough at idle but fine at higher rpms I have changed the plugs,wires,cap,rotor,fuel filter.and aic valve on the fuel injection. run great going down the road just when idling very ruff what should i check next?

 

miesk5

96 Bronco 5.0
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yo SMOKEY,

WELCOME!

Try a Self Test for Diagnostic Trouble Codes (DTC)s by my pal, BroncoJoe19

http://broncozone.com/topic/14269-code-reader/?&pid=74587&mode=threaded

The engine temperature must be greater than 50° F for the Key On Engine Off (KOEO) Self-Test and greater than 180° F for the Key On Engine Running (KOER) Self-Test.
Run it around to heat the engine up and shift thru all gears incl Reverse. Then turn off all accessories/lights, etc.

Make sure A/C is off and transmission is in Park (automatic) or in Neutral for a Manual & release clutch.

Do Key On Engine Off (KOEO) portion first.And Post em here according to:
KOEO
&
KOER

This if for rough idle in a 94, but process is same

http://www.thedieselstop.com/faq/9497faq/maint/vra/vra07015.htm#vrachart9

For vacuum issues;

see Vacuum Line Acronyms, leak test & gauge pic OCT 2013 at http://broncozone.com/topic/23994-90-58l-getting-continuous-code-33-and-running-code-44/

post #20

 

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