Have been spending some time working on the car over the past few weeks replacing items such ignition leads, dizzy cap, rotor button, plugs and fuel filter.
I also opened up my ECU and noticed some leaking capacitors. I decided to buy replacement capacitors from Digi-Key and attempt the repair myself. I did a bit of electronics when I was younger and still have a good quality Weller soldering station.
So far I have only replaced two capacitors out of the 8 inside the ecu. The results are amazing. A hesitation issue that I've been trying to track down since I've owned the car is gone and a recent issue of rough/rich idling is also resolved! It really is smooth now. I will probably attempt the replacement of the other caps when I have time next.
Whilst I was waiting for the caps to arrive I went ahead and bought a Blox Fuel gauge adapter and Turbosmart Fuel pressure gauge. I was suspicious that my rough/rich idling was due to a faulty fuel pressure regulator causing too much fuel pressure.
After connecting up the gauge and checking the pressures as per the BGB it turns out the fuel pressures and regulator are working fine.
https://www.digikey.com.au/ These are the CAPs I used which are the correct ones for a gen 3 3sgte ecu. I went with United Chemi-Con and Panasonic. I also bought some 1mm solder and some de-soldering wick. Pic below is of the package from Digi-Key. Very well packed!
C816 = 50v 10uf
C895 = 50v 10uf
565-1702-ND on Digikey - United Chemi-ConC002 = 63v 47uf
P15285CT-ND on Digikey - PanasonicC101 = 10v 100uf -> 50v 100uf
C894 = 10v 100uf -> 50v 100uf
565-3581-ND on Digikey - United Chemi-ConC823 = 35v 15uf -> 63v 15uf
565-1718-ND on Digikey - United Chemi-ConC004 = 35v 33uf
P14434-ND on Digikey - PanasonicC105 = 10v 220uf -> 50v 220uf
P12397-ND on Digikey - Panasonic