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Old 08-17-2012, 02:54 PM   #1
Ky///m3
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Lean Issue, Need Help

Guys,

first of all, i have been in contact with HPF and we are trying to sort out the issue, but i felt maybe you guys could aid in the process by maybe catching something that myself and HPF may have missed.

I am running lean in pump mode. afr go straight to 10.5 of 11 upon going full throttle, when i hit 6000 RPM, afr hit 12.5.

things checked

-race gas added to tank to insure gas is not bad
-no vac leaks around injectors/rail
-no vac leaks by wideband/boost sensor
-no vac leaks by fuel regulator
-fuel pressure tested and is fine meaning both pumps are working correctly
-map sensor tested and functioning properly
-wideband tested and functioning properly

i am making HPF a video tonight and then sending them my EMS and wideband/boost sensors, harness and injectors.

Chris seems to think that possibly it could be an issue with my vanos. Have any of you all had issues such as this where the vanos was the culprit? what do you all think is causing the issue?

thanks in advance
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Old 08-17-2012, 05:41 PM   #2
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Originally Posted by Ky///m3 View Post
Guys,

first of all, i have been in contact with HPF and we are trying to sort out the issue, but i felt maybe you guys could aid in the process by maybe catching something that myself and HPF may have missed.

I am running lean in pump mode. afr go straight to 10.5 of 11 upon going full throttle, when i hit 6000 RPM, afr hit 12.5.

things checked

-race gas added to tank to insure gas is not bad
-no vac leaks around injectors/rail
-no vac leaks by wideband/boost sensor
-no vac leaks by fuel regulator
-fuel pressure tested and is fine meaning both pumps are working correctly
-map sensor tested and functioning properly
-wideband tested and functioning properly

i am making HPF a video tonight and then sending them my EMS and wideband/boost sensors, harness and injectors.

Chris seems to think that possibly it could be an issue with my vanos. Have any of you all had issues such as this where the vanos was the culprit? what do you all think is causing the issue?

thanks in advance
How long has this been going on? Did you catch it right away? No alarm, right? Have you always monitored your AFR's like a hawk or just glance at them once a day? I am thinking of rigging up an audible lean alarm for my car. Just for such an occasion like yours!
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Old 08-17-2012, 06:18 PM   #3
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I haven't had any problems with my vanos but there is definitely a whole lot that can go wrong with it...whether this would cause a lean condition? I dunno. Sorry I'm not really of any help on this.
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Old 08-17-2012, 06:22 PM   #4
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Have you actually watched the fuel pressure during an entire pull?
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Old 08-17-2012, 06:51 PM   #5
Ky///m3
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Have you actually watched the fuel pressure during an entire pull?
I will upload the video I made and post it shortly
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Old 08-17-2012, 07:13 PM   #6
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You have a stage 1 right Ky? That's just a single intank uprated fuel pump right? If not is it possible your secondary pump isn't coming online (if you have two)?
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Old 08-17-2012, 07:39 PM   #7
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Quote:
Originally Posted by Bdave View Post
How long has this been going on? Did you catch it right away? No alarm, right? Have you always monitored your AFR's like a hawk or just glance at them once a day? I am thinking of rigging up an audible lean alarm for my car. Just for such an occasion like yours!
Jp tuned that into the aem from the start. You just gotta wire it up

And i dont think its vanos.....at all. You do have two walbros. So if only one is working youll still have peak pressure thats correct. But not volumn

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Old 08-18-2012, 08:49 AM   #8
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Made these yesterday. Shows fuel pressure taken from port on regulator
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Old 08-18-2012, 09:23 AM   #9
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Something seems wrong with your fuel pressure. It should go smoothly up with boost 1-1 against load. Yours jumps up 5 psi at one point but I do not see it rising with boost. Not sure why it jumps up like that.
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Old 08-18-2012, 11:19 AM   #10
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you fuel pressure goes to 80?
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Old 08-18-2012, 11:37 AM   #11
Ky///m3
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you fuel pressure goes to 80?
Max for the test was 85ish per the guy recording
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Old 08-25-2012, 01:12 AM   #12
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Not sure if this will help but I know my car went lean at HPF when the fuel sock came off the pickup tube in the tank. John caught the problem and remounted it before dyno run could commence. It resolved the problem in my case.

Maybe Clogged or Faulty injector? I know u can send them in to get re flowed
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Old 08-25-2012, 09:28 AM   #13
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Something seems wrong with your fuel pressure. It should go smoothly up with boost 1-1 against load. Yours jumps up 5 psi at one point but I do not see it rising with boost. Not sure why it jumps up like that.
Clogging and unclogging fuel filter maybe? Is it possible that these are symptoms of a fuel pump going bad?
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