what have i done?

[weazgti]

Not too sure because its not filling engine with fuel and i can start it but the relay goes nuts and cuts the fuel supply.
Thinking maybe when i took ecu out i might of somehow got water on the fusebox but then i cant really be 100 % till ive got a known working relay in there and taken the fusebox down. Im finding this disconnecting battery before removing ecu plug a bit weird because i have searched but found no answer to this and i ve asked mates that have taken ecu out without disconnecting battery and they ve had no problems.

[jamie_pyrite]

Maybe you've just been really unlucky then? It seems the biggest variable in this is your ECU.

Engine works fine

ECU is tampered with but nothing else

Engine no longer works.


There is a pattern, but there's also the possibility that it's a coincidence and it is something else! Have you checked all the plugs are firmly connected to the fusebox?

[mattkh]

......Thinking maybe when i took ecu out i might of somehow got water on the fusebox

Hi
Impossible beacuse the fusebox is on the drivers side and the ECU is on the passengers side.
When you unplugged the ECU, was it raining or is the car under a cover ?
Disconnect the battery and put it on charge.

Then unplug the ECU again and :
1. take a picture of the pins for us
2. use a hairdryer and blow dry on a very low heat to drive any moisture away
3. clean the pins with a maplins switch cleaner
4. allow to dry before pushing the plug back on
5. clean and redo the earth points

and away you go hopefully.

[weazgti]

Maybe you've just been really unlucky then? It seems the biggest variable in this is your ECU.

Engine works fine

ECU is tampered with but nothing else

Engine no longer works.


There is a pattern, but there's also the possibility that it's a coincidence and it is something else! Have you checked all the plugs are firmly connected to the fusebox?

......Thinking maybe when i took ecu out i might of somehow got water on the fusebox

Hi
Impossible beacuse the fusebox is on the drivers side and the ECU is on the passengers side.
When you unplugged the ECU, was it raining or is the car under a cover ?
Disconnect the battery and put it on charge.

Then unplug the ECU again and :
1. take a picture of the pins for us
2. use a hairdryer and blow dry on a very low heat to drive any moisture away

Yes you re right,probably just been unlucky and damaged ecu and hopefully try a mates one on there.
Ecu is drivers side same side as fusebox. I did it on a dry day outside but the area underneath the ecu was damp so will be giving the hairdryer treatment like you say. Also i havent had a chance to check back of fusebox ill try have a look today and get some pics of the pins on the ecu.
3. clean the pins with a maplins switch cleaner
4. allow to dry before pushing the plug back on
5. clean and redo the earth points

and away you go hopefully.

[weazgti]

cleaned pins and dried out and car starts fine. only thing is whilst testing i had the ecu cage laid against the bodywork of the car and it was sparking.
I put it all in and if i move it it sparks around the plastic nut and either stalls the engine or makes it surge. I tried putting another of the white plastic clips on the round locating pins in the scuttle because it looked like one should be there but that made it refuse to start.
Is the cage round the ecu act as an earth or something? Have cleaned all the crap out from underneath it and it starts and runs the same as before now so it was definatly that.
Perhaps someone could tell me if it supposed to have an earth or post a pic of there ecu in the car.

[rubjonny]

no that definitly should not happen, sounds like the ign amp is earthing itself thru the cage? check the earths around the battery -ve, there should be a chunky black wire with a ring terminal on the end, that runs from ign amp all the way to the battery.

also, have you tried replacing the ecu relay?

[weazgti]

Would that be one of the wires in the plug or is it just supposed to have an earth attached to the ignition amp somehow?
Hopefully this is the reason i cant time the car properly and why it runs worse with something switched on like the headlights.

[rubjonny]

ign amp should earth via that chunky black wire i mention above, if its earthing thru the casing to the ecu bracket something isn't right. might be the ecu thats damaged internally and earthing via the big metal heatsink on the back?  either way, shouldnt happen!

[weazgti]

This is all i have.The only chunky black wire off the battery is the one going to gearbox and next to battery.

[rubjonny]

the brown/white wire in that pic is the TCI unit earth, that one should run all the way to the battery -ve. its pin 2 on the plug, so you could check it for continuity to ground with a multimeter. you could pop the tci-h unit off the ecu bracket, then see if if the bracket still sparks to earth.