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car dying, idle issues with maf-t gen2


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#1 kaaos

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Posted 04 August 2018 - 04:33 PM

So in still troubleshooting my maft- gen 2. The tune seems to get jerky at times.
i noticed at idle my afr will shoot up really lean like 20 or so. sometimes it will die.

my isc voltage is stuck at .3 not .9
I was thinking about going back to stock and cutting out the maf-t gen 2 but i think it will not help much if my isc is not at the specified .9 has anyone else had this problem? should i get a new harness? or where is the voltage dropped and provided to the isc?

I also seem to be getting a o2 code at the factory ecu but this may be because on every startup or if i ever kill the car while driving the innovate lc-1 older version i have may have an issue with this.
when i am driving under load and when i slow down alot of times it will kill. the rpms dip too low. Even though I have tried the same maf-t gen 2 settings as everyone else to fix this issue it seems to make it not run at all. I do have a fidanza aluminum flywheel.

Edited by kaaos, 05 August 2018 - 12:11 AM.

Maf-t Gen 2 gm 3" maf
Rebuilt motor Wiseco 8.0 compression forged pistons
Race prepped rods
Arp rod and headgasket studs.
Headworks valve Job factory polished valves Polished chambers
1989 ECU, BSEK, Ajusa HG, Extensively ported and polished head (Alabama NJV)/intake/exhaust manifolds, Aeromotive fpr, Hallman MBC, all new brakes and bearings, *DM 2.5" exhaust with a Hooker Aerochamber.
stock 12a, hope to change soon to a small 16g.
240mm Fidanza aluminum 10.5 pd flywheel xtd 225mm clutch
1989 Transmission with 36k





#2 TexasQuest

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Posted 05 August 2018 - 12:44 AM

Have you tried an ISC/TPS reset?
88 Fiji Blue -Tsi
Zoom clutch, Fidanza flywheel, Stedebani shifter, KSport coilovers, ST swaybars, abs delete, a/c delete, cruise delete, JVE, BSEK, TEP steel brake lines, LSP braided cooler lines, CX Racing radiator,  MK1 silicone hoses, MK1 pullies, *DM hard pipes & intercooler,14G turbo, ported exh. manifold, MAF Translator, 3.5" GM maf, Turbo XS RFL bov, *DM 3" exhaust, Cusco front strut bar, TEP rear strut bar, Enkei 92's, HKS turbo timer, AEM wideband, AEM boost gauge, AEM oil pressure gauge, Hallman boost controller
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View PostJohnnyWadd, on 04 March 2010 - 10:01 PM, said:

my shaft was big i dont know what your talking about.

#3 kaaos

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Posted 07 August 2018 - 08:40 AM

yeah, I noticed when this issue is happening the tps voltage drops below .5 usually .3, Engine has two good new grounds on this side one on manifold and one down below by alternator.

Edited by kaaos, 07 August 2018 - 08:42 AM.

Maf-t Gen 2 gm 3" maf
Rebuilt motor Wiseco 8.0 compression forged pistons
Race prepped rods
Arp rod and headgasket studs.
Headworks valve Job factory polished valves Polished chambers
1989 ECU, BSEK, Ajusa HG, Extensively ported and polished head (Alabama NJV)/intake/exhaust manifolds, Aeromotive fpr, Hallman MBC, all new brakes and bearings, *DM 2.5" exhaust with a Hooker Aerochamber.
stock 12a, hope to change soon to a small 16g.
240mm Fidanza aluminum 10.5 pd flywheel xtd 225mm clutch
1989 Transmission with 36k

#4 speedyquest

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Posted 07 August 2018 - 08:52 AM

I'm guessing either your wiring is damaged someplace or you've got a grounding issue. It seems more likely that's it's grounding though. It would explain why both your tps and isc motor are not getting proper voltage. Maybe other sensors like your O2 sensor as well.

1987 Flatty Starion -- Widebody Conversion -- V-Mount Setup --  JDL Tubular Manifold  --  MX-6 Intake -- MS3-Pro -- AEM FPR  --  ARP head studs -- 3" hood exit exhaust -- Hahn Racecraft 16g --  Tial F38 Wastegate -- Tial Q Bov -- Short route piping -- 5 lug & LSD conversion -- Tubular Front End -- Manual Steering Rack Conversion -- Manual Brake Conversion -- Stack Digital Dash -- AEM UEGO -- D2 coilovers -- full GNT poly bushings & mounts -- four 8" rears -- car lightened significantly...  More to come!


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#5 speedyquest

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Posted 07 August 2018 - 08:53 AM

Another thought, have you checked and cleaned both your ecu ground and also looked at your fuseable link connections?

1987 Flatty Starion -- Widebody Conversion -- V-Mount Setup --  JDL Tubular Manifold  --  MX-6 Intake -- MS3-Pro -- AEM FPR  --  ARP head studs -- 3" hood exit exhaust -- Hahn Racecraft 16g --  Tial F38 Wastegate -- Tial Q Bov -- Short route piping -- 5 lug & LSD conversion -- Tubular Front End -- Manual Steering Rack Conversion -- Manual Brake Conversion -- Stack Digital Dash -- AEM UEGO -- D2 coilovers -- full GNT poly bushings & mounts -- four 8" rears -- car lightened significantly...  More to come!


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Build Thread --->  http://www.starquest...opic=143564&hl=


#6 kaaos

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Posted 07 August 2018 - 10:35 PM

I remember cleaning the ecu ground slightly, but did not check the wire very well. I need to go through the fusable link connections.

Edited by kaaos, 07 August 2018 - 10:38 PM.

Maf-t Gen 2 gm 3" maf
Rebuilt motor Wiseco 8.0 compression forged pistons
Race prepped rods
Arp rod and headgasket studs.
Headworks valve Job factory polished valves Polished chambers
1989 ECU, BSEK, Ajusa HG, Extensively ported and polished head (Alabama NJV)/intake/exhaust manifolds, Aeromotive fpr, Hallman MBC, all new brakes and bearings, *DM 2.5" exhaust with a Hooker Aerochamber.
stock 12a, hope to change soon to a small 16g.
240mm Fidanza aluminum 10.5 pd flywheel xtd 225mm clutch
1989 Transmission with 36k




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