sorry to anyone for the re-post of this , as it appears in the "INLINE SIX" fourm as well , but I believe i have a FUEL INJECTION, issue more then engine , or other portion of it.. will look forward to any of your idea's........... here are the original post's.......


"ROUGH IDLE"

1994 f-150 / 1/2 tn / 2wd / 5 spd / w-o air / just replaced stock motor , 6 cyl. 300 Y 4.9L MFI complete long block. runs great in general. now have 56 miles on new motor & when started all seem's great , sound , feel , look BUT !! after initial start up ( about 30-45 second's) the idle drops & a rough idle condition now exsist's.. i have done multiple check's on vacum , NO leaks . timing is set at 10* BTDC with all vacum plugged & spout pin connector removed. timing is perfect from what i can tell ( original dist. used / TFI-IV with remote mounted ICM module) I AM LOST .. truck ran great before with old motor ( motor replaced due to damage from wrong water pump installation - bolt thru #1 cylinder) , anyway,, even performed self test by jumping EEC-IV self test ( STI) system on board. and only got 2 codes , 111 system pass & 522 Vehicle not in PARK or NEUTRAL during KOEO. HUMM..............even tried both advance & retard timing from spec , but no difference in correcting condition... any & all help would be welcome.. before i must take to dealer shop... please post here or for faster result's PLEASE e-mail me @ coorslight4u@attbi.com..... or even phone help ( i pay long distance),,, thank you ...............MICHAEL


"UPDATE to ROUGH IDLE (16 post ago)"

i have noticed two things since my previous post ............. sounds more like a dead miss a friend ( who is a mechanic, but not expert in fuel injection ) thought... so i played around with that thought , and found that if i unplug the fuel injectors one at a time , a considerable difference in idle is a result of unpluging each , with the exception of # 3 injector,, humm must be a proglem with # 3 ij. , (yes the volt's to it is correct or at least same as rest), now i did clean the injector's & rail , when re-installing on new motor, new o-rings the whole nine yards .. maybe i lodged something in side of it instead of getting it out ? , if i want to test it off the truck, how to hook power to it ? straight 12 batt. ? i don't think so ,, don't want to burn it up yet either ... also it appears as if # 3 plug is wet when i remove it , i have tripple checked the gap & condition of all pluges even re arranged them from one cyl. to another . and # 3 is still comimg out slightyly wet ?? also if i unplug the # 3 wire , it as well makes no difference really,, yes it is fireing , se a spark jumping frim tip os screw in end to frame,,, anyway , it must have something to do with # 3 cylinder,,, but what ????? going to get a compression & leak down test done... it is just a real drag with new motor that other then roughness is great feeling & sounding, also going to clean the entire throttle body component & upper intake completely.... will wait for your help... or post any updates ... remember my e-mail is " coorslight4u@attbi.com ",, please be sure to read my first post,,,,


in close i believe that the # 3 IJ is not sending correct amount of fuel, maybe too much , that would explain the wet plug... any other idea's ?? i have been doing alot of cross reference on part numbers , and found many years of truck's & van's same part number , so i am going to my local "pull-a-part" , and get a few IJ"s in morning & will try them out , before I go & buy a new one ,, my local shuck's & napa are about even $50.00 each... ,,, will post fix if i find it...





:-X11

 

Before you go replacing injectors @ $50 a piece, I'd switch around the injectors and see if the problems transfer to the other cylinders. If they do, then replace the injector and see if that helps.

 

yes i did this & there was no change , swapped several ij even.. SO ! ,, i know there is a problem with my # 3 cyl. today i started to check vavle's.. well i pulled valve cover & re-installed all equip. so i could start & run with out vavle cover & when i did this I started to tighten & lossen # 3 I & E rocker arm's,, guess what ,, all of a sudden it ran great , when i lossenen them uop a few turn's,, and further more with them lossened up & i unplug the # 3 IJ wire harness , it makes a diference ( drop) in engine , as do all the other,, so i detirmened valves were to tight & not allowing all of gas to burn off , well problem with this is with them so loose to make it run good , they continue to back out & lossen even more to point of a rael bad rattle & fear of the bolt coming out ??? also i am able to turn the push rod's by hand with engine running.. only on # 3 thou-.. so possibly i have colappsed lifters ?? they not pumping up it appears.... or do ihave a problem with valves ?? hummm..... wish i new more about the actuall working's of an engine inside,, ....

 

have decided i have a miss with my # 3 cly , not fuel related so will be moveing my complete post away from here , you can still help me thou- @

https://www.ford-trucks.com/dcforum/DCForumID9/1354.html


thanks...