so heres my problem. I started to notice that my 91 f150 4.9l i6 rwd was running a little rough. So i got the plugs replaced and had the timing adjusted, but still didnt work. SO i took it home and cleaned the throttle body and man was it dirty. Put it back on and its actually worse! esp at 1000rpms the thing will vibrate then be clean, then vibrate again. Now for a 17 yr old truck i dont expect it to be perfect but last year it wasnt having any of this vibration. Its got a 120,000 miles on it and the engine is in mint condition. I was thinking mayby injectors? If that would be the solution how woudl i go about removing the fuel rail and where the hell is the schrader valve???? i coudlnt find it on this.
alright good cause i guess i did clean the IAC. I dont have a code reader so i guess ill have to use the check engine light to do it. Anyone ever try it? Im gonna go by the instructions @ www.fordfuelinjection.com and post the codes if anything happens.
Alright well i got the codes but they confused the **** out of me.....from the KOER test i got 13,11,16,53,85,36,53,21,15? But Im not sure i read them right so i made a video of the codes if anyone wants to see if they can figure it. I also got the KOEO and CM codes but same problem. Also i noticed while the KOER was doing its thing the truck was tripping all over itself?
Here are the videos
you have 3 digit codes
KOEO; 111, 111 no critical codes
stored codes 634 transmission manuel lever position sencor circuit out of self test
(so is mine but I know mine is not adjusted properly)
KOER; 116, 538, 536, 632
116 = ECT (Electronic cooling Temp) out of self test range .3 to 3.7v (this could be the problem)
538 = Insufficient RPM change during KOER dynamic response test/ Operator error (you may have to hit the gas durring diagnostic not sure)
536 = Brake On/Off circuit failure / switch not actuated during KOER test ( I am pretty sure you have to hit the brake durring test)
632 = Overdrive cancel switch not changing state (E4OD) ( and you have to hit this switch as well)
ECT is the only code worth looking at. I have had the same code with same symptoms.
Where is the ECT?
Is it the same sencor as as temp guage?
If temp guage is ok is the ECT ok?
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