cylinders 2 and 4 running rich :confused: - Miata Turbo Forum - Boost cars, acquire cats.

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Old 06-04-2008, 02:36 PM   #1
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Default cylinders 2 and 4 running rich :confused:

So I'd been wondering why in the hell my car was cruising/idling/everything pig rich (like 11.5 and richer CONSTANTLY) and thought I'd change my plugs. This is what came out, cyl 1 on left, 4 on right:

Name:  DSCN0616.jpg
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Size:  92.9 KB
Name:  DSCN0617.jpg
Views: 6
Size:  81.1 KB

So, judging by those, I don't think it's my tune...

Here's two logs, just driving normally to and from work:
Attached Files
File Type: zip 3 jun drive home rich as crap.zip (284.3 KB, 55 views)
File Type: zip 4 jun drive to work rich as crap.zip (334.0 KB, 49 views)

Last edited by kotomile; 06-04-2008 at 02:57 PM.
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Old 06-04-2008, 02:53 PM   #2
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are you even getting fuel in 1 and 3?
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Old 06-04-2008, 02:58 PM   #3
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I would think so? There's a bit of soot on them, just not as much as 2 and 4.
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Old 06-04-2008, 03:03 PM   #4
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I don't know dude, I'd clean/replace the plugs and look again in a few days.
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Old 06-04-2008, 03:05 PM   #5
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Swap injectors around.
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Old 06-04-2008, 03:08 PM   #6
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I'd try swapping your injectors around and see if the problem moves with them. You might have two leaky ones.

*edit* sam beat me to it.
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Old 06-04-2008, 03:08 PM   #7
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maybe, but not unless/until the symptoms repeat.
identify a problem before looking for a solution.
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Old 06-04-2008, 03:35 PM   #8
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I should mention the car idles like a Subaru and bucks a lot during cruise, definitely NOT smooth anymore. I remember the cylinders are batch-fired and was wondering if that might have anything to do with it.
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Old 06-04-2008, 03:44 PM   #9
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i think the batches are 1+2 & 3+4. a quick trip to madracki would tell for sure.
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Old 06-04-2008, 04:32 PM   #10
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spark is 23 14
fuel is 13 24
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Old 06-04-2008, 04:37 PM   #11
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I'd assume you are getting spark on all 4 since its running super as nasty rich on 2 and 3 and the way its batched....

so either you have 2 dead injectors, or two leaky injectors, or im completely wrong.
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Old 06-04-2008, 04:46 PM   #12
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Leaky injectors would be a good explanation, but the fault in it is that it might not be that likely that both 2 and 4 started leaking simultaneously.

I just got the taillight too man, thanks!
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Old 06-05-2008, 02:14 PM   #13
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Could you post your MSQ? I'd like to take a look and see if there are any settings for different fueling on the separate injector channels.
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Old 06-05-2008, 02:48 PM   #14
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im sure Matt speaks of this....
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Old 06-05-2008, 04:25 PM   #15
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Quote:
Originally Posted by Matt Cramer View Post
Could you post your MSQ? I'd like to take a look and see if there are any settings for different fueling on the separate injector channels.
Absolutely, at work now but I will later for sure.
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Old 06-05-2008, 04:39 PM   #16
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Curious where that goes. I'm wondering if something burned out in the MS, just leaving the injectors on. That, or a short somewhere.

Did it happen suddenly? Does it always do it, or is it on and off?
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Old 06-05-2008, 07:22 PM   #17
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Here's the .msq \/

Abe: That's what I was thinking might possibly be the problem, but didn't want to jump to that conclusion lest it be something more simple.

It always does it, I can't remember when it started but it hasn't let up since I first noticed it happening. It's like clockwork; after startup, AFRs will be around 15:1, then climb to 17:1ish, then drop steadily to 11.5ish, sometimes 10:1 in cruise. Just measured my MPG - 16 MPG...
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File Type: zip 15 joe perez idle.zip (5.9 KB, 60 views)
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Old 06-05-2008, 07:30 PM   #18
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Oh, it doesn't happen for a while?

If you run it for a while, 20 min or something, shut it off then immediately start it again, how is it?

I wonder if it's electronics heating up....
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Old 06-05-2008, 07:32 PM   #19
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post a log too. needs more log.
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Old 06-05-2008, 07:34 PM   #20
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your ego settings and AFR table are screwy.


RPM Based ACCEL needs to be off.


ASE table should go to 0% at 160*


timing and fuel tables at idle look crazy low.


overboost is at -5.7psi, might screw things up.
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