rough idle after warm up - F150online Forums



Pre-1997 Models

rough idle after warm up

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  #1  
Old 02-25-2012, 10:38 PM
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rough idle after warm up

Hi all, I have a 95 f150 302 auto 234,000 miles, been tuned up, plugs wires cap rotor fuel filter air filter, last week i took the upper plenum off cleaned it out with carb\intake cleaner (was really caked up with carbon) pulled the injectors cleaned them and rebuilt them new o rings screens pintle caps, replaced the gaskets cleaned the iac egr has been blocked off for years. engine runs\idles great cold after warm up it idles rough sometimes put lite throttle to it and it really misses like air before fuel then push the throttle more and runs fine did a vacum check all good sprayed starting fluid around all posible leak spots nothing checked tps (good) o2 sensor is the only thing i havent checked, no cel. ran rough till i did the cleaning then ran great till i took it for a ride then the rough idle started does it in park and in gear. the only thing i think it could be is weak injectors or a bad o2 sensor. all input is greatly appreciated thanks.
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Old 02-26-2012, 07:08 AM
glc
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You might have to replace the IAC.
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  #3  
Old 02-26-2012, 10:48 AM
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when u rebilt the injectors u didnt snap the tiny adamizer off the end when u were taking the old caps off did u. its an easy thing to over look ive done it once myself. and it caused a shutter a 1700 rpm and rough idle
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Old 02-26-2012, 04:12 PM
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thanks for the replies, i figured it out and you aint going to believe what it was. i took everything apart again and checked, cleaned, and reasembled everthing i had off, still did it. (wtf really pissin me off) thought i would recheck the distributor for play, put it back in and hooked my timming light up and when i unplugged the little button on the fender it stopped running rough idled real smooth here i must've not tighted the hold down bolt enough and the distributor moved last time after reassemble so no more miss and rough idle. WOW!!! so thanks for the help.
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Old 02-29-2012, 11:06 PM
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ok so what was the "little button" ???
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Old 02-29-2012, 11:23 PM
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hes probly talkin about the spout conector
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Old 03-04-2012, 04:35 PM
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yes sorry i forgot the name of it it is the spout connector
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  #8  
Old 03-04-2012, 05:32 PM
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yea the spout makes the distributer not advance so u can time it its the same as taking the vacum line off the vac advance distributer
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