replaced waterpump and thermostat and now car runs rough
while out running errands today my factory waterpump (orange plastic impeller) went out. car got into the red for a short amount of time. replaced the waterpump and thermostat, and all related gaskets and now the car runs like it is missing on one or more cylinders.
anyone have any ideas? i took it out for a 20 mile trip to make sure the cooling system was well bled and to see if the problem would clear up. still doing the same thing..... I'm REALLY hoping that I didnt blow my headgasket...
after the trip I checked the oil and coolant for contamination, so far so good.
last time i changed the plugs i did notice a tiny bit of oil in the plug recesses in the head, do you think that when the engine got hot that the plug hole seals could have leaked more oil into the plug holes? i know from exp that can cause similar problems. guess i'll pull the coil packs today and check.
well, after further troubleshooting, i have found that the #4 coil is not getting signal to fire, all other cylinders will pulse voltage on the two outer pins of the coil connector... wtf could cause this?
after even further troubleshooting i found that pin number 50 is the wire that supplies a positive signal to the coil telling it to fire. i checked for continuity between pin 50 at the ecu and the black wire on the coil plug, continuity across the whole wire... so basically... i have a bad ecu/dme right?
Is there anything that i could have done to fry the ecu in such a way when doing the waterpump? or is this a freak coincidence?
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