replaced waterpump and thermostat and now car runs rough

[Acid0atm3al]

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.

[beewee]

check the sparkplug cable maybe its just accidentally removed.
after that, next suspect will be your fuel pump, how old it is.

or might be just some air leaks.

[brettski]

Are there any temperature sensor that you removed in the process of changing the water pump, did they all go back into place and get connected properly?

[Acid0atm3al]

the only sensors i removed is the coolant level sensor on the bottom of the surge tank, and the (temp?) sensor on the side of the radiator.

i did however remove the ac condenser, so the condenser fan plug is not hooked up to anything.

beewee: are you referring to the coilpack ground wire that goes on one of the waterpump bolts? if so, it was reinstalled.

[Acid0atm3al]

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.

[Jack Dabsy]

Any errors on the dash?

[Acid0atm3al]

no check engine light.

did dome troubleshooting, the 3rd coil from the rear of the engine isnt firing. have continuity from the coil plug to the wire splices where they all bundle together...

have swapped coils with another cylinder and still not getting anything.... im at a loss...

[Jack Dabsy]

At coil or at spark-plug?

[Acid0atm3al]

the coil itself isnt firing... i dont understand, maybe there is a problem with the wiring harness to that coil. but i dont have any idea how to troubleshoot it.

[Acid0atm3al]

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?

[Acid0atm3al]

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?

[beewee]

coincidence. nope, I mean the sparkplug wires or the sparkplug itself.
By the way, as I was asking How old is your Fuel pump?
are you sure there are no air leaks?

sometimes during the process, we remove some hose that we fail to return.

[Acid0atm3al]

fuel pump isnt too old, and i have proper fuel pressure.

there is no sparkplug wire, its coil on plug.

[Jack Dabsy]

If you swapped the coil and that same coil has failed on a different cylinder then that coil needs replacing.

[Acid0atm3al]

no, the coil worked on the other cylinder. #4 remained dead