Suspected misfire - idle log
Originally Posted by rotarywanker
(Post 4729951)
I was referring to the point about rear o2 sensor readings contributing to any of the symptoms. They would not.
I will add a "however" lol, I have read that the rear o2 sensor COULD affect readings if BOTH front and rear are showing signs of failure. This was a while ago, so I'll have to hunt the info down. Anyways, I believe that deep down inside that I was trying to say your FRONT o2 sensor could be giving bad readings. I'm still recovering from too much booze last week... :40oz: |
Originally Posted by RX8Soldier
(Post 4729968)
Ok, I had a serious brain lapse. You're right that it's the FRONT o2 sensor that gives the readings. I know that, but I think I've just been reading too much elsewhere and not paying much attention and mixing up my points.
I will add a "however" lol, I have read that the rear o2 sensor COULD affect readings if BOTH front and rear are showing signs of failure. This was a while ago, so I'll have to hunt the info down. Anyways, I believe that deep down inside that I was trying to say your FRONT o2 sensor could be giving bad readings. I'm still recovering from too much booze last week... :40oz: |
Originally Posted by rotarywanker
(Post 4729978)
Ugh who knows though. May as well test everything.
Just wait until you delve into the modding world. THAT can and will drive someone with OCD nuts! :icon_no2: |
Originally Posted by RX8Soldier
(Post 4730066)
Yeah man, this is unfortunately what's required when dealing with troubleshooting. Not everything is cut n dry as we'd all like it to be.
Just wait until you delve into the modding world. THAT can and will drive someone with OCD nuts! :icon_no2: |
When I had my car tuned I got the idle bumped up to about 800-900rpm.... the dips happen way less frequent for me now. I only noticed it in like 50deg weather and less..... but its sporadic and happens to me every once in a while. Say every 10th time I start it cold and let it idle to fully warm. If I drive the car, get the revs up there then stop and let it idle the popping doesnt exist, it's only when warming up from cold. I have a known very small exhaust leak on my downpipe though too, where the air pump ties into it. I will be blocking that off in the spring, the car is in storage now for the winter.
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Originally Posted by 9krpmrx8
(Post 4729887)
Dips to 4.7 or averages? It will dip if the idle speed dips. Have you done a vacuum reading on your engine at idle warmed up?
Thoughts? http://youtu.be/-8DUdX-Jh1s |
Originally Posted by rotarywanker
(Post 4730544)
Just did a vacuum test at idle, fully warm. Its pulling just over 16. Here is a video.
Thoughts? http://youtu.be/-8DUdX-Jh1s What elevation are you at? The FSM says MT- 19.6 to 16.6 in Hg. |
Originally Posted by 9krpmrx8
(Post 4730548)
What elevation are you at? The FSM says MT- 19.6 to 16.6 in Hg.
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Well just over 16 is technically below spec but not drastically.
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https://cimg2.ibsrv.net/gimg/www.rx8...be2f174f2.jpeg
Originally Posted by 9krpmrx8
(Post 4730550)
Well just over 16 is technically below spec but not drastically.
Im certain of the leak just because i get a slight whistle, almost like a mini turbo spool, at very light throttle in third gear at 3100-3300 rpm. I capped the vfad nipple to rule it out. I also have a hand vacuum pump if there is a specific line you think i should test. But this would explain the low maf flow reading and high fuel trims at least. https://cimg3.ibsrv.net/gimg/www.rx8...239e5f26e.jpeg |
The slight whistle could just be TB whistle
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