Vitara (G16B) Shunting/Missing issues

[eXc]

Hi All,

My car (Vitara G16b, EFI) started shunting while driving (not at idle) about 8 months ago. It only did it once, then it was fine for a few weeks. It got worse and worse, now does it almost all the time.

It used to only happen once the car is warm and it happens any time now.

It shunts in a range of situations. It has missed at revs between 2500 and 4000 ( I rarely go above 4000). It usually happens if the car starts to 'bog down' say mid way up a hill. However it has happened on the flat, just crusing at 60 in 4th.

It has done it in 2/3/4/5th gears.

if I remove the Coolant Temp Sensor, the problem goes away mostly. It has happened a few times over a 4 hour trip. The problem is it uses an extra 25% fuel leaving it unplugged.

After a new temp sensor it didn't fix it. Figured it must be computer, replaced computer, same issue.

I have a mate that had an oscillioscope, so we have run it over all the inputs and outputs, the only one that put out an error was the output from the computer to the injectors, which has a point where it cuts.

What else could be in play here, for it to not play up 99% if the sensor is unplugged, but it does when it is plugged in?

Things I have done;
- New Coolant Temp Sensor
- 2nd hand computer
- New spark plugs
- New leads
- Cleaned throttle intake
- Cleaned air filter
- Replaced dizzy cap/rotor (not the whole thing)
- New Fuel Filter
- New Fuel Pump

Videos that show what it is doing;

http://www.youtube.com/watch?v=gtSc6I99NcE" onclick="window.open(this.href);return false;

http://www.youtube.com/watch?v=VWchWChOZ6s" onclick="window.open(this.href);return false;

Cheers
Chris