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Old 10-03-2021, 02:47 PM #1
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Engine Sputtering and Very low Idle on 3.4L when Shifting to R/D

When I pop my truck in either R or D the idle gets very low and it starts to sputter/shake. I also noticed that if I leave my truck to idle for more than 5 minutes the check engine light turns on which is the bad o2 sensor after the cat but I don't think that's my problem. When driving, it does goes away but I want to know as to why my truck is giving me a very low idle when shifting to R and D. This is intermittent - when I tried to diagnose it, it wasn't doing it. Any tips to resolve this?
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Old 10-03-2021, 03:05 PM #2
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I'm gonna be cleaning the troubled IAC Valve right now and see if that fixes it.
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Old 10-03-2021, 04:55 PM #3
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What code are you getting for the check engine light?

Sounds like a vacuum lead possibly. Do a visual inspection for any cracked old hoses or loose or unattached lines.
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Old 10-03-2021, 05:18 PM #4
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Quote:
Originally Posted by 4runnerfiend View Post
What code are you getting for the check engine light?

Sounds like a vacuum lead possibly. Do a visual inspection for any cracked old hoses or loose or unattached lines.
I'm not sure on the code # but I know it was the o2 sensor code behind the cat. Hoses seem to be decent enough but I did find the intake hose near the throttle body cracked so I will replace it.

The IAC Valve was hella gunked up so cleaning it with TB Cleaner made it look and perform better and while I was there I also cleaned the TB itself. First inicial startup..... it ran normal but the idle drop was not present anymore so I hope it stays like that for good (the problem was intermittent).
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