VW Polo 1.6 AEE 1.6 - Starts but onkly runs for a few seconds - Fixed #Archived Message
Posted by Roger Jordan on December 4, 2008, 9:42 pm
This car would start but only run for a few seconds, seemed like classic fuel starvation. We had an identical situation a couple of weeks ago which was traced to faulty coil/amplifier assembly, to try to save time a known good coil assy was swapped across from an identical vehicle with no improvement at all but suspect unit worked fine on donor vehicle. A quick look inside the distributor revealed a disaster area, cap and rotor arm burnt to a frazzle rotor arm shaft bearing missing with swarf particles in the bottom of the cap. A new distributor is fitted along with a new coolant sensor (four wire type) as this was the only fault code found, car now starts and revs fine for around five minutes or so when the idle becomes progressively more uneven as the engine warms up eventually stalling. I started the engine without realizing the coolant sensor was unplugged and the engine idled fine, on reconnecting the sensor the revs soon drop and get progressively worse until the stall occurs again, as I have five volts on the blue supply wire to the sensor I am now thinking the signal on the brown/blue wire back to the ECU is getting corrupted, it appears to go from the coolant sesor via the hall sensor and inlet manifold and throttle sensors, now this is where I am getting confused, I would expect the signal wire to go direct to the ECU, does anyone have any ideas if this is the case or have I got my wires crossed, by the way I was unable to carry out throttle adaption with Vag Com although the butterfly does move when engine idling , I do not appear to be able to make comms with throttle body at all, in group 98 the figures do not relate at all. Any pointers would be most welcome as the new distributor has doubled the value of the car !! but I had to start from some sort of good base. Best regards Roger.