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Old 16-07-2020, 13:38   #1
Vault
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Rough idle evo iv

So startup is normal, ICV functioning, MAF clean, plugs replaced, no vacuum leaks, no intake/boost leaks. And NO CEL O2 sensor is reading .019 on idle Occasionally displaying just 0 with evoscan, fuel trim low is like -3 to -4 on idle and rpms stutter from 840-925. I feel like this points to LAMDA, but havenít had the chance to grab one. Any other input?
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Old 16-07-2020, 14:16   #2
grants
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Forget about evoscan for the time being

You need too reset idle parameters by driving the car for 20 mins or so,job
done
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Old 16-07-2020, 14:49   #3
Vault
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Quote:
Originally Posted by grants View Post
Forget about evoscan for the time being

You need too reset idle parameters by driving the car for 20 mins or so,job
done
Iíve let it idle for an hour with the A/c on, again with the A/c off, driven it forever, reset base idle. Literally have done everything and itíll idle perfect until I drive it. Once I come to a stop it just sounds like itís loping like crazy then drives fine until I stop and it attempts to idle again. The problem randomly appeared a few days ago and nothing Iíve tried will get rid of it
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Old 17-07-2020, 05:57   #4
pmugabi
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Sounds like an air leak post MAF
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Old 18-07-2020, 09:42   #5
r3k1355
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Throttle body is a common leak point isn't it? Can get a seal kit for the shaft and stuff
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Old 21-07-2020, 10:10   #6
Vault
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Throttle body is a common leak point isn't it? Can get a seal kit for the shaft and stuff
No leaks. So if forcing the car to remain in open loop makes the problem disappear, then front O2 is shot? Iím only trying to guarantee itís the front O2 because paying for parts locally in japan, the shop time for me to fix the vehicle myself, and pulling/re-installing the radiator are all things I donít wanna do just to shotgun a part at the car and not fix it
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Old 14-09-2020, 10:01   #7
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Quote:
Originally Posted by Vault View Post
No leaks. So if forcing the car to remain in open loop makes the problem disappear, then front O2 is shot? Iím only trying to guarantee itís the front O2 because paying for parts locally in japan, the shop time for me to fix the vehicle myself, and pulling/re-installing the radiator are all things I donít wanna do just to shotgun a part at the car and not fix it
Same here......I forced the car into open loop and idle is solid as a rock....back to closed loop and
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