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So you have a mobile aquarium and mini zoo, did you remember to feed the fishes? ;)
I guess the leaking should be resolved first if you wish to continue to keep this car. Electrical control units are like cats, they do not like water. Rats loves wirings which cause the death of circuits.
It is possible the ECU is damp causing internal shortings of the curcuit and this would not allow the vehicle to run or keep running.
Remove the ECU and dry it out first. Clean and resolder the circuit board if required. The replaced relay could be the PGM-FI main relay but these items are known to cause intermittent failing even though they might be new. Get Jay to remove it and resolder the circuit board. That should eliminate the relay faulrt.
As to the wirings inside some rats tummy, if they had been repaired, they should be ok but you would need to check for new missing portions.
Since the vehicle starts most of the time, it most probably is not the distributor. As the mechanic is not able to encounter the problem, maybe you should learn some trivks so that if the problerm occurs, at least you can try some basic testing to see what is missing to cause the non starting.
It should be either ignition or fuel and here is a link that you can go through to get some idea what to look for. Any additional information that you can provide the mechanic is going to narrow down what to look out for.
Does the PFG-FI indicator light stays on when you are not able to start?
Sunday, October 11th, 2009 AT 3:57 AM