While car was running I pulled back the spark plug wire (connecting spark plug 1 and the coil on top of spark plug 4) and there was no sparking. I tried same with other wires and coils and there was sparking. I rotated the coils just to see if coil was bad and once again when pulled back the wire connecting to 1 there was no sparking. I changed spark plug 4 and tried again. Once again no sparking. I did not do any testing etc with spark plugs or wiring at 1 3 or 5 as they are covered with the exhaust manifold
With the key 'on':
I checked all the fuses and no bad fuses. I checked the wire harness to coil 4 and it responded the same as coil 6 - left most terminal was hot with 12v light tester. I do not have diagram of the electrical connector at the coil but have attached diagram of the wire harness leading into all the coils.
I checked the throttle valve sensor and it did not feel bound up - I did not hook it up to any diagnostic equipment as thought the ignition failure probably caused the the throttle code. I hope I put it back correctly- if you have tips on how to judge let me know.
Any idea what is is causing the 1/4 mis fire? Could the new sensor be faulty?
have the same problem?
Tuesday, July 14th, 2015 AT 9:53 AM