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Underbody braces, turbos and more!

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PostPosted: Sun Apr 10, 2016 4:46 pm 
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Joined: Thu Apr 15, 2004 12:27 am
Posts: 3064
Location: Aruba
So I went to a buddy with my '91 gti to install an apexi neo in his '92 GTi.

We removed the dash in order to remove the heater under the dash. He's going turbi and want to install a lot of things under the dash (catch can, water meth tank etc.).

After the dash was removed, I installed the apexi neo. I installed the A6 (maf wire) wire in a way that if he wanted to take out the apexi, he can reconnect the A6 wire without a problem because I used the male/ female plugs.

I triple checked that every wire of the apexi is connected right. And than we went ahead and connected the battery.

Switched to on, apexi went on. I selected the settings for the GTi. Tried to start the engine, engine doesn't want to start.
There's no spark! That's weird. Before we even started with the install, car started and it ran fine.

Anyway, I took out my car's ecu, installed it in my buddy's gti, and it started the engine. It started it with and without the apexi. We even added fuel in the apexi and we could hear engine' rpm change.

Ok, now comes the weird part.

I took my buddy's ecu and installed it in my gti, and guess what, it started my GTI!! Everything was fine.
No check engini nothing. So I took it back out of my gti, and reinstall it in my buddy's car, again no spark!!
I put a fuse into diagnostic terminal and it gave code 12. Supposedly everything is fine. It doesn't want to start tge car with or without the apexi. But it starts my car without a problem. And my car's ecu will start my buddy's engine, with and without the apexi.

What's going on???

How come the ecu that used to work fine, won't give spark to start the engine, but will give spark in my gti to start mine?
Both ecu's are mk3.
My car is mk2. My buddy is mk3.

Any hint?

1991-GTi: JE 75mm 11:1 pistons,Ported head, Single UD pulley (OCC),Sandros chip,Aluminium flywheel,3tech 222/365 cams, Cultus headers,Cultus IM,50mm tb,Crane cams adjustable cam gears,Apex suspension, 4.39fd GB.
1989-GTi: 3Tech 210/340 Cams,Cultus IM, B&G springs, TD04L turbo, Apexi SAFC, Suzukird UD pulley, Circuitse7en dual boost controller, AEM wideband, AEM water / meth injection kit, HKS bov.
2001-Altezza AS200: Stock.-sold
2003-EVO7 GT-A
Aruba "one happy island".

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