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keninger keninger is offline
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Default Uneven Cylinder Timing - 03-10-2019, 04:51 AM

In most logs cylinder one timing is a bit different from all the others.

I have new index 12 injectors
I have new NGK plugs gapped @ 0.022
I have swapped coils on cyl 1-2 to test, but still, ign 1 remains different from all the others

I have not done a walnut blast on the engine yet, it has 70k miles on it

What could cause different cylinder timing?
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Default 03-10-2019, 01:39 PM

Quote:
Originally Posted by keninger
In most logs cylinder one timing is a bit different from all the others.

I have new index 12 injectors
I have new NGK plugs gapped @ 0.022
I have swapped coils on cyl 1-2 to test, but still, ign 1 remains different from all the others

I have not done a walnut blast on the engine yet, it has 70k miles on it

What could cause different cylinder timing?
“Perfect” timing isn’t going to happen every log. In fact, small corrections occur even when stock.

What you don’t want is big drops / cylinder to cylinder variance

Based on your log, I think everything looks healthy.

What fuel are you using?



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e92 AT 335xi 2.0
Doc Race Kit 6062
Fuel-It!Platinum DIY PI Kit + Stage 2BL
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keninger keninger is offline
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Default 03-10-2019, 01:49 PM

Quote:
Originally Posted by Dave @ BMS/Fuel-It!
“Perfect” timing isn’t going to happen every log. In fact, small corrections occur even when stock.

What you don’t want is big drops / cylinder to cylinder variance

Based on your log, I think everything looks healthy.

What fuel are you using?

I am using 100RON gas. I know that perfect timing won’t happen but what bugs me is that all the other cylinders are mostly working the same but ign 1 wanders off. I see sometimes dips in timings, it drops 3 on one cyl then it recovers, but I know that is normal. What I really don’t like that even on not full load all the cylinders can maintain the exact same timing but not cyl 1.
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keninger keninger is offline
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Default 03-10-2019, 02:00 PM

In this log you can see how crazy cyl 1 timing goes with that spike and how other cylinders are still working the same after the pull
Attached Files
File Type: csv 2019-03-08 15_59_43 Map-6 pad_2.csv (15.1 KB, 11 views)

Last edited by keninger; 03-10-2019 at 02:10 PM..
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Default 03-10-2019, 09:06 PM

Couple things you can try...

Close your plug gap a bit more... .018-.020 maybe

Compression / leakdown test that cyl- see if it’s close to the others

Knock sensors - you can try running the desensitized setting to see if that cleans up timing on all- this is NOT a recommendation, but if u want to try it, you can- it’s up to you if you want to.



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keninger keninger is offline
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Default 03-11-2019, 02:10 AM

I have tried gapping the plug down to 0.02 form 0.022 but no change.

Next up is a leak down test. If that comes out good, then I will try to desensitize the knock sensors and have a light cruise to monitor timing on cyl 1. I know the risk of desensitized knock sensors, that's why I just want to monitor regular driving not wot.
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Default 03-11-2019, 11:31 AM

Quote:
Originally Posted by keninger
I have tried gapping the plug down to 0.02 form 0.022 but no change.

Next up is a leak down test. If that comes out good, then I will try to desensitize the knock sensors and have a light cruise to monitor timing on cyl 1. I know the risk of desensitized knock sensors, that's why I just want to monitor regular driving not wot.
Sounds good- keep us posted

How many miles on the motor?



http://www.fuel-it.biz/

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Doc Race Kit 6062
Fuel-It!Platinum DIY PI Kit + Stage 2BL
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keninger keninger is offline
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Default 03-11-2019, 12:33 PM

Quote:
Originally Posted by Dave @ BMS/Fuel-It!
Sounds good- keep us posted

How many miles on the motor?
Only 70k miles
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Default 03-11-2019, 10:48 PM

Quote:
Originally Posted by keninger
Only 70k miles
Ok so all things considered fairly low. How many of the 70k tuned? Are you the Original owner?

Curious to see leakdown figures.



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keninger keninger is offline
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Default 03-11-2019, 10:59 PM

Quote:
Originally Posted by Dave @ BMS/Fuel-It!
Ok so all things considered fairly low. How many of the 70k tuned? Are you the Original owner?

Curious to see leakdown figures.
I am the second owner, the car was bone stock and I have been tuned for 15k miles. I was mostly using it on map 1-2-5. only had a bef and map 6 for like 3 months. But in an oil change interval of 4k miles it only consumes like 4 onces of oil. Also catch can barelly catches anything, no smoke from the exhaust, no smoke from the oil fill up at idle, so we will have to see
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keninger keninger is offline
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Default 03-14-2019, 02:23 AM

This is an answer I got from one of the groups.

“With a jb4, cylinder 1 is sampled at a quicker rate than 2-6 so sometimes it looks a bit different and spikes often won’t show up on the other cylinders. You’re good.”
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