I have a 90 honda accord lx model that my father and I recently have got running again. The previous owner knew little about cars and started taking the engine apart due to a loss in power. The actual problem turned out to be the catalytic converter, which has been removed. This car became my project for my first car but turned into a much longer endeavor. We just recently got the engine completely back together and started up. The idle immediately shot to 5000 rpms and kept climbing. After doing some research, I replaced the IAC valve and adjusted the HIC valve hoping to fix the problem. The problem persisted so we unplugged the IAC to see if that did anything. Starting the car with the IAC unplugged made the idle start fluctuating between 1000 and 2000 rpms like a typical vacuum leak would cause. We checked for vacuum leaks as best we could but did not have any success. I then started the car with the IAC plugged back in and the rpms were straight back up to 5000 and climbing. There is coolant going to both valves so it is not a coolant control problem. We are pretty much out of ideas so any suggestion you might have would be very appreciated. Thanks in advance.
Monday, June 24th, 2013 AT 7:15 PM