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Rough Idle (Found new thing)
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gktrseat
New User
Apr 10, 2024, 11:42 PM
Post #1 of 6
(1313 views)
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Rough Idle (Found new thing)
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Hi everyone. First of all sorry for bad english but i think I succeeded 
New thing
I have news. (I told my problem under the message this edit new.) When i unplugged cable of MAP and Oxygen bank 1 sensor (both of same time) rough idle gone, engine run perfect. If i connect one of them ( just map or just oxygen or both of, 3 case do same thing) rough idle come again. Is it tell any story about broken part??
cylinder compression test is fine.
Old Message
My car 1.2 Tsi CJZB engine 66 kw manual. First my problem is starts when engine get warm. Before that this rough idle sometimes exists just one times or two times when engine cold, so it is not important. When engine raise to 80-100 degree engine rough idle every 2 seconds. And yesterday i recognized when i watch oxygen sensor bank 1 value up to 0.9 dropping 0.1 value as its supposed to be. but when it is dropping to 0.1 then my engine do like misfire rough. But absoluetly not misfre because VAG-COM didnt count any misfire and there isnt any fault code. Some mechanicer do lots of thing like change spark plug ,coil, clear throttle and similar things like check the timing belt and timing, but everything okay. But i pretty sure my problem exist when oxygen sensor bank 1 dropping 0.1 . so what part is broken? (if i press clutch or turn headlight, there is no problem because car go to rich fuel, oxygen sensor 0.9 for electric) Thank you.
(This post was edited by gktrseat on Apr 15, 2024, 1:29 AM)
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Hammer Time
Ultimate Carjunky
/ Moderator
Apr 14, 2024, 12:01 PM
Post #2 of 6
(1187 views)
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Re: Rough Idle with Detail Explanation
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This is not a car we have in the US so we don't have any specific info on it. Don't be so sure about the misfire count. PCM's don't always see them for what they are, especially if it's an injector problem.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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gktrseat
New User
Apr 15, 2024, 1:16 AM
Post #3 of 6
(1166 views)
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Re: Rough Idle with Detail Explanation
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Thanks for answer. I have news. When i unplugged cable of MAP and Oxygen bank 1 sensor (both of same time) rough idle gone. If i connect one of them ( just map or just oxygen or both of, 3 case same do thing) rough idle come again. Is it tell any story about broken part??
cylinder compression test is fine.
(This post was edited by gktrseat on Apr 15, 2024, 1:29 AM)
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Hammer Time
Ultimate Carjunky
/ Moderator
Apr 15, 2024, 3:58 AM
Post #4 of 6
(1144 views)
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Re: Rough Idle with Detail Explanation
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No, that doesn't tell you too much. It just forces the PCM to go to open loop default and ignore those sensors.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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gktrseat
New User
Apr 15, 2024, 4:46 AM
Post #5 of 6
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Re: Rough Idle with Detail Explanation
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First of all i am grateful for you replying. In my town mechanicers can't tell anything. Just some mechanicers said "you need new valve" but some mechanicers said "all cylinders compression fine, so dont need new valve" which one is true? Is it possible dirty valve with good compression? If it is, then probably problems it is.
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Hammer Time
Ultimate Carjunky
/ Moderator
Apr 15, 2024, 4:59 AM
Post #6 of 6
(1136 views)
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Re: Rough Idle with Detail Explanation
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If you truly have good compression readings on all cylinders you can eliminate a mechanical valve problem. Since it can run smooth at times by eliminating sensors, that would indicate some sort of fuel control issue that still needs to be determined.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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