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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 09-03-2013, 09:33 PM   #1
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high positive Amul, seeking remedy

It's a 2002 89k 9-3 with a Nordic 3+ tune and all requisite hardware but the upgraded IC. I have been running this ECU for the last 4 months or so without any issues. Within the last week Amul numbers began to climb over the usual +500s territory. So much so that it hit +2045 yesterday while merging from an on ramp and later falling back to 1800s. MAF is original but seeing that both requested and calculated air numbers are pretty much identical, I'm assuming it's working well? New fuel filter was just installed and rear O2 sensor cleaned. Suspecting faulty FPR, I pulled the 3.5bar out (bought new from GS Taliaferro ) and swapped stock unit back in just to see if there was any difference. None, Amul still high. WIS points to a faulty MAF, low fuel pressure. Is there anything else I should be looking at? Would really like to bring it under control.
Appreciate any suggestions. Thanks !
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Old 09-03-2013, 10:17 PM   #2
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Often it's the AMM / MAF.
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Old 09-04-2013, 06:24 AM   #3
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Try cleaning the MAF and re-adapting the ECU. If it still persists, find someone with a good working MAF you can test with.
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Old 09-04-2013, 08:07 AM   #4
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Put the 3.5bar for back in and test pressure at the rail. With the stock 3bar you will see a high amul for sure.

It could also be the MAF, give it a good cleaning and/or swap a known good one if you can.




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Old 09-04-2013, 08:17 AM   #5
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Originally Posted by rabbit View Post
Put the 3.5bar for back in and test pressure at the rail. With the stock 3bar you will see a high amul for sure.

It could also be the MAF, give it a good cleaning and/or swap a known good one if you can.




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Thanks guys !
I will check the fuel pressure. As per MAF, I have a used back up unit and it's also showing nearly no deviation between calculated and requested air so I'm assuming it works well. I'm running injector cleaner as we speak.

Additional question: what is the hose that enters throttle body at the back right under the limp solenoid? I see some light cracking in it and I'm wondering if this could affect my A/F.
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