Devilsfutbol17
15+ Year Contributor
- 406
- 48
- Jul 27, 2007
-
Bellingham,
Washington
I have been running lean for quite a while and just about 2 months ago I did a few upgrades and all of a sudden I couldn't idle properly. I found my capacitors leaked and shorted my ISC drivers, but I now have a different ECU from my friends car and it solved my ISC issue, but I'm still not able to get my idle perfect.
Before recent upgrades, I had only a 3" exhaust and a crushed 1g BOV on my car for mods and my fuel trims were all maxed at 139% and my exhaust would pop on deceleration.
All these upgrades were at the same time, and after doing them my idle went to shit:
~Fidanza Aluminum Flywheel
~ACT 2600 Clutch setup
~2g ported Exhaust Manifold
~Megan Racing Tubular O2 Housing
~1g Intake Pipe
~Relocated my battery to the intake canister position
~1g Alternator
~Evo 3 16G
~EGT gauge
~Miata Battery
I found one of my caps leaked and shorted my ISC driver and my MAF was throwing a CEL , so I replaced the ECU and it helped dramatically, but replacing the MAF did nothing really.
Now It doesn't matter where I adjust my idle, it will never sit steady at any rpm. It will move up a little, then down a little, like between 812-906 rpms. Then sometimes it will even stall. Most of the time my O2 doesn't cycle at idle either.
Other things I have checked:
~No exhaust leaks
~All boost leaks fixed
~New Denso O2 sensor
~Idle switch it working properly
~TPS is set at 10% at idle
~No extra slack or tension on throttle cable
~Ground strap is attached to downpipe
~Removed all vacuum lines & blocked off EGR
~Bypassed FIAV
~Resistances are good on ISC
~Set my base timing correctly
As to the fuel, I recently swapped in a Fuel Lab AFPR and set the pressure with the hose plugged to 38 psi. I also put in a walbro 255 hp pump and replaced my fuel filter.
I don't know what else could be causing my idle to not behave properly. The only thing I can think of for my fuel trims is that my injectors are clogged.
Any help is appreciated. Thanks
Before recent upgrades, I had only a 3" exhaust and a crushed 1g BOV on my car for mods and my fuel trims were all maxed at 139% and my exhaust would pop on deceleration.
All these upgrades were at the same time, and after doing them my idle went to shit:
~Fidanza Aluminum Flywheel
~ACT 2600 Clutch setup
~2g ported Exhaust Manifold
~Megan Racing Tubular O2 Housing
~1g Intake Pipe
~Relocated my battery to the intake canister position
~1g Alternator
~Evo 3 16G
~EGT gauge
~Miata Battery
I found one of my caps leaked and shorted my ISC driver and my MAF was throwing a CEL , so I replaced the ECU and it helped dramatically, but replacing the MAF did nothing really.
Now It doesn't matter where I adjust my idle, it will never sit steady at any rpm. It will move up a little, then down a little, like between 812-906 rpms. Then sometimes it will even stall. Most of the time my O2 doesn't cycle at idle either.
Other things I have checked:
~No exhaust leaks
~All boost leaks fixed
~New Denso O2 sensor
~Idle switch it working properly
~TPS is set at 10% at idle
~No extra slack or tension on throttle cable
~Ground strap is attached to downpipe
~Removed all vacuum lines & blocked off EGR
~Bypassed FIAV
~Resistances are good on ISC
~Set my base timing correctly
As to the fuel, I recently swapped in a Fuel Lab AFPR and set the pressure with the hose plugged to 38 psi. I also put in a walbro 255 hp pump and replaced my fuel filter.
I don't know what else could be causing my idle to not behave properly. The only thing I can think of for my fuel trims is that my injectors are clogged.
Any help is appreciated. Thanks
