dante2 Posted July 6, 2023 Posted July 6, 2023 When it first starts it runs ok and rpms hover around 730-750 for a few seconds. Then the rpms drop to 600-690 and the ST fuel trim bounces between 0-28. Readjusted the TPS (it was out a little) and indexed the distributor. It idles the same while in drive sitting at a light. I have a REM that I am getting the data from. I have another IAC I can try but any other thoughts on what is going on. Thanks for the help.
Ωhm Posted July 6, 2023 Posted July 6, 2023 ST fuel trim can stay and read low (0-28) as long as it doesn't keep lowering the LT fuel trim (128). Meaning both FTs work together.
dante2 Posted July 6, 2023 Author Posted July 6, 2023 Thanks Ohm I'll check on the LT tomorrow and see if it's fluctuating. I haven't been good to since I bought it. It has sat more than it's been driven, less than 3k miles in 7 years I believe. Started messing with it again last year and have been slowly bringing back to life. Last month I went through Cruiser's tips for the 2nd time since it was purchased. The idle has never been great on this truck and honestly I can't remember if it ever was. Some on here talk about how their idle is so smooth or purrs like a kitten. Mine sounds like a bear with indigestion.
87MJTIM Posted July 6, 2023 Posted July 6, 2023 If LTFT is >128, then STFT should be<128 to bring LT back down, on a normal operating engine. How high is LTFT?
dante2 Posted July 6, 2023 Author Posted July 6, 2023 87MJTIM thank you. Got some homework for tomorrow.
87MJTIM Posted July 7, 2023 Posted July 7, 2023 Download the complete manual. It’s very helpful. See the DIY section
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