Hi fellow 1uzfe owners, apologies for the long winded post, but this quite a story. We are in the middle of a transplant of a 92 1uz from a SC400, we have recently had issues with the beast not idling when cold. After research, we concluded that the ECU caps my be the problem. We took the ECU to a family member who is an electronic engineer and repairs all sorts of devices(but has never done an ECU). We bought all the capacitors from digikey.com after lots of research. The said family member had lots of trouble replacing the capacitors, and 1 was not changed due to access. A few were very tricky and he was not confident, but we pushed on as he did the worst looking capacitors. Before we installed the ECU again, we replaced the spark plug leads, rotor buttons, and dizzy caps, and re-sealed the rocker cover gaskets. After putting everything back together and starting the beast, it was clear that the ECU was not right, it still would not idle, and was running very roughly. All of a sudden the engine stopped for no reason, and would not turn with the starter motor. we removed all the spark plugs and then turned the motor with the starter, then one of the cylinders shot out a stream of fuel across the garage. We concluded that the injector for that cylinder was stuck open and the motor was hydralocked with fuel. We turned it with the starter motor for a few minutes to get all the fuel out. Next we got another ECU and plugged it in and it seemed to idle okay, but we noticed a knocking noise which seemed to happen every turn of the LH camshaft. We have taken nearly all of the front of the engine off looking for something to cause the knocking as it seemed to sound external. The only thing left on the front is the timing belt and idlers and tensioner. Today we checked the compression on all cylinders, and they are all over 175psi. This is driving us nuts! The other noteworthy clue is that if we turn the motor by had on the front crank pulley bolt, it locks when the same cylinder that hydralocked is at Top Dead Centre. If we force it, it will go past this point, but will always lock at the same point. We don't really want to tear the motor apart looking for the issue unless we really have to. Any clues would be welcome as we are stuck for ideas. Thanks in advance. By the way, we are running this engine in a 2000 Jeep Wrangler with plans of taking the beast off road eventually, as well as taking the caravan away every now and then.