humanz 3 Posted March 15, 2010 Firstly, i've had some idling issues from the go on my 1.9 GTI. I'm still trying to cure these. To this end, I recently got a 1.9 afm to match my 1.9 ECU for my 1.9 engine, after running the engine on a 1.6 AFM and ECU. But the 1.9 ECU has always behaved a bit strangely, which is why I was using a 1.6 ECU in the first place: once the car is idling in neutral, I can rev all the way to 6500 rpm without a miss. No problems at all. But once I'm really giving it the beans on the road, the car acts as if it has a fuel cut right around 5500 rpm. Something just stops doing what it's supposed to. Once the revs drop back down to below 5500, the car has some go again. I don't know what to make of it. Additionally, my ECU has this wire that comes out of it which is joined with a second wire leading back into the ECU. Any ideas what those wires could be for? Is it a known mod or something? I'm not using a tachy relay. The car only does this with the 1.9 ECU. The 1.6 ECU does not exhibit this, and will rev as far as I let it without a problem. I've recently changed the ignition amp, plug leads, coil, and swapped in a spare fuel pump I had lying about. I plan to purchase a new coil and uprated fuel pump in a few weeks. So is it just a bad ECU, or is it that the ECU isn't working well with some other component in the car? Share this post Link to post Share on other sites
welshpug 1,737 Posted March 15, 2010 have you tried a different distributor? or just the cap and rotor arm? Share this post Link to post Share on other sites
humanz 3 Posted March 15, 2010 Yes. Different distributor. Share this post Link to post Share on other sites
