AEM EMS series 2
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Joined: Jan 2008
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From: Daytona Beach, Fl
AEM EMS series 2
I have a boosted 05 running the AEM EMS series 2 and while driving and also just revving it will rev hang between 3.5k and 4.5k rpm range. AFR remains normal. it does it mostly when car is under a partial load. like 5psi of vacuum. the car is tuned and that helped it but it still hangs for appox. 1 to 1.5sec. Any ideas/help is appreciated. it bothers the hell outta me.
Joined: Mar 2002
Posts: 588
Likes: 7
From: Bellingham
I have the same rev hang issue which happens at 2.5k or 3k during decel - no load. It's not consistent.
A few other issues I haven't resolved:
1. Data logs show a fuel trim based on AIT that doesn't correspond to my Air Temp Fuel Trim table - When I zero out the table, the AEMTuner shows no real time trims but the datalogs show random Fuel Trims (AIT) in the 4-6% range.
2. The immobilizer key light on the dash glows brighter with RPM or maybe load - I haven't really diagnosed it but do notice it surging brighter when doing pulls. Is this a "feature" or a screwed up output?
BTW: Application is 2002 AP1 with 2.2 shortblock.
A few other issues I haven't resolved:
1. Data logs show a fuel trim based on AIT that doesn't correspond to my Air Temp Fuel Trim table - When I zero out the table, the AEMTuner shows no real time trims but the datalogs show random Fuel Trims (AIT) in the 4-6% range.
2. The immobilizer key light on the dash glows brighter with RPM or maybe load - I haven't really diagnosed it but do notice it surging brighter when doing pulls. Is this a "feature" or a screwed up output?
BTW: Application is 2002 AP1 with 2.2 shortblock.
Joined: Mar 2002
Posts: 588
Likes: 7
From: Bellingham
^ Thanks for the reply.
Regarding the rev hang. Assuming tps is calibrated properly, do you have a suggestion for tps vs idle mapping? Which table are you referring to? Idle% vs Target? Doesn't this only apply when Idle FB is active? If Idle FB is active below 1900 rpm, for example, can it still cause a rev hang near 3000 rpm?
Thanks again - we appreciate your advice.
Regarding the rev hang. Assuming tps is calibrated properly, do you have a suggestion for tps vs idle mapping? Which table are you referring to? Idle% vs Target? Doesn't this only apply when Idle FB is active? If Idle FB is active below 1900 rpm, for example, can it still cause a rev hang near 3000 rpm?
Thanks again - we appreciate your advice.
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Joined: Jul 2010
Posts: 239
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From: San Diego, California
Originally Posted by GEARHEAD' timestamp='1306251719' post='20609628
I have the same rev hang issue which happens at 2.5k or 3k during decel - no load. It's not consistent.
A few other issues I haven't resolved:
1. Data logs show a fuel trim based on AIT that doesn't correspond to my Air Temp Fuel Trim table - When I zero out the table, the AEMTuner shows no real time trims but the datalogs show random Fuel Trims (AIT) in the 4-6% range.
2. The immobilizer key light on the dash glows brighter with RPM or maybe load - I haven't really diagnosed it but do notice it surging brighter when doing pulls. Is this a "feature" or a screwed up output?
BTW: Application is 2002 AP1 with 2.2 shortblock.
A few other issues I haven't resolved:
1. Data logs show a fuel trim based on AIT that doesn't correspond to my Air Temp Fuel Trim table - When I zero out the table, the AEMTuner shows no real time trims but the datalogs show random Fuel Trims (AIT) in the 4-6% range.
2. The immobilizer key light on the dash glows brighter with RPM or maybe load - I haven't really diagnosed it but do notice it surging brighter when doing pulls. Is this a "feature" or a screwed up output?
BTW: Application is 2002 AP1 with 2.2 shortblock.
The "rev hang" issue the original poster is talking about is most likely caused from the tps not be calibrated properly and/or the tps vs idle mapping too aggressive. The IACV is able to bypass more air when lifting the throttle with either/both situation and the "rev hang" type issue will occur.
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Joined: Oct 2005
Posts: 14,614
Likes: 2
From: Denton, TX
as he said, go to the coil/injector template.
If you cant find sonething, click and look through all the tabs. If that doesnt work, then look in the help documentation.
#2 is caused from all the injectors selected in the coil/injector template. Only select Inj #1-4 and the issue will stop. Injector #9 output corresponds to the immobilizer light. You are actually watching the "pulsing" that the injectors are operating at (millisecond pulsing). Its an issue with the basemap that AEM has for the 6052 boxes in the v17 software.
The "rev hang" issue the original poster is talking about is most likely caused from the tps not be calibrated properly and/or the tps vs idle mapping too aggressive. The IACV is able to bypass more air when lifting the throttle with either/both situation and the "rev hang" type issue will occur.
im having that same problem with the immobilizer light... how exactly do u fix it? i have the aem tuner installed on my laptop, so what or were do i go to fix it?
[/quote]
If you cant find sonething, click and look through all the tabs. If that doesnt work, then look in the help documentation.
Originally Posted by Evans Tuning' timestamp='1306291657' post='20612258
[quote name='GEARHEAD' timestamp='1306251719' post='20609628']
I have the same rev hang issue which happens at 2.5k or 3k during decel - no load. It's not consistent.
A few other issues I haven't resolved:
1. Data logs show a fuel trim based on AIT that doesn't correspond to my Air Temp Fuel Trim table - When I zero out the table, the AEMTuner shows no real time trims but the datalogs show random Fuel Trims (AIT) in the 4-6% range.
2. The immobilizer key light on the dash glows brighter with RPM or maybe load - I haven't really diagnosed it but do notice it surging brighter when doing pulls. Is this a "feature" or a screwed up output?
BTW: Application is 2002 AP1 with 2.2 shortblock.
I have the same rev hang issue which happens at 2.5k or 3k during decel - no load. It's not consistent.
A few other issues I haven't resolved:
1. Data logs show a fuel trim based on AIT that doesn't correspond to my Air Temp Fuel Trim table - When I zero out the table, the AEMTuner shows no real time trims but the datalogs show random Fuel Trims (AIT) in the 4-6% range.
2. The immobilizer key light on the dash glows brighter with RPM or maybe load - I haven't really diagnosed it but do notice it surging brighter when doing pulls. Is this a "feature" or a screwed up output?
BTW: Application is 2002 AP1 with 2.2 shortblock.
The "rev hang" issue the original poster is talking about is most likely caused from the tps not be calibrated properly and/or the tps vs idle mapping too aggressive. The IACV is able to bypass more air when lifting the throttle with either/both situation and the "rev hang" type issue will occur.
[/quote]
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.. THANKS DFWs2k 
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Joined: May 2004
Posts: 1,049
Likes: 5
From: Myrtle Beach
Any more info on the rev hanging issues? I'm having the same problem but when Im cruising at any speed, if I let off the gas to engine brake, te car continues on as if the cruise control was on. Then it starts to go between engine braking and rev hanging and causes the car to shake back and forth until I push in the clutch. Any help or advice would be appreciated.
Btw, 2002 with SOS sc @ 14 psi. AEM EMS v2. Stock TB. ID 1000s. Aeromotive 340. Okada coils.
Btw, 2002 with SOS sc @ 14 psi. AEM EMS v2. Stock TB. ID 1000s. Aeromotive 340. Okada coils.
Registered User
Joined: Oct 2009
Posts: 38
Likes: 0
Originally Posted by GEARHEAD' timestamp='1306251719' post='20609628
I have the same rev hang issue which happens at 2.5k or 3k during decel - no load. It's not consistent.
A few other issues I haven't resolved:
1. Data logs show a fuel trim based on AIT that doesn't correspond to my Air Temp Fuel Trim table - When I zero out the table, the AEMTuner shows no real time trims but the datalogs show random Fuel Trims (AIT) in the 4-6% range.
2. The immobilizer key light on the dash glows brighter with RPM or maybe load - I haven't really diagnosed it but do notice it surging brighter when doing pulls. Is this a "feature" or a screwed up output?
BTW: Application is 2002 AP1 with 2.2 shortblock.
A few other issues I haven't resolved:
1. Data logs show a fuel trim based on AIT that doesn't correspond to my Air Temp Fuel Trim table - When I zero out the table, the AEMTuner shows no real time trims but the datalogs show random Fuel Trims (AIT) in the 4-6% range.
2. The immobilizer key light on the dash glows brighter with RPM or maybe load - I haven't really diagnosed it but do notice it surging brighter when doing pulls. Is this a "feature" or a screwed up output?
BTW: Application is 2002 AP1 with 2.2 shortblock.
The "rev hang" issue the original poster is talking about is most likely caused from the tps not be calibrated properly and/or the tps vs idle mapping too aggressive. The IACV is able to bypass more air when lifting the throttle with either/both situation and the "rev hang" type issue will occur.