Engine Performance problem
1990 Ford F150 6 cyl Two Wheel Drive Automatic 180000 miles
I have a rough idle (it will stall when stopped). This will happen for a few days then run great for a few days. When it is happening the truck still has plenty of power, runs fine during acceleration but dies shortly after I let off gas. When it is running bad it is running VERY rich (that is why its running rough I think) but I can't figure out why its running rich. In the past few months I have put in new plugs and control module. The check engine light is NOT on but I checked it and it gives me a code 44, which is the Thermactor System. I followed the Haynes manual and found no problems with the system. I have cleaned the throttle body. I checked the voltage on the idle speed control and cleaned it. I installed a spacer kit under the speed control as per old Ford bulletin, checked fuel pressure (50psi) and cleaned injectors. I have read lots of forums and found people with this exact problem (on Fords) but no answers on what fixes it. The fact that it is intermittent and shows no codes is killing me.
have the same problem?
Tuesday, September 8th, 2009 AT 4:10 PM