'99 Toyota Corolla running rough with check engine light

I got this customer car that he/she bought a couple days ago from our dealership. The complaint was the car runs rough sometimes and the check engine light is on.

The first thing I did was to check what was the codes that brought up the check engine light. I had a feeling it was a misfire code. I was right!! The codes were P0300 random misfire, P0302 cylinder#2 misfire and P0303 cylinder#3 misfire.

Next step I did was to remove #2 and 3 spark plug and check the plugs visibly if its good. Both spark plugs looked fine. Then I looked at the ignition coil pack that was connected with #2 and #3 spark plug wires. The casing looked fine. So I decided to remove the spark plug wires that was connected to it and look inside where it connects.

I found the problem. It was water inside the plug wires where it connects to the ignition coil pack. #2 and #3 cylinders share the same coil packs so obviously it caused the misfire and check engine light on.

You might be thinking, how did water get inside there? Well, when it's sold, before the car is given to the customer it gets detailed from top to bottom, inside and out. When the detailer cleaned the engine bay he used the pressure washer to get rid of all the dirt. While doing that the ignition coil pack got wet.

What I did to clean the coil pack and both plug wires is to spray it with contact circuit cleaner and then air hose it dry. Then I plugged it back and went for a 30 mile test drive to set the monitors on the car.

Came back to the dealership with the car with no check engine light and no rough idle.

I'm fucken good!

2005 Chrysler Town and Country with no heat blowing

It took me about two hours to find the problem!! I've checked all the fuses and relays related to the heating and air conditioning and found no problems.

I also looked at the wiring diagrams if there was any hidden relays or fuses and found nothing. Then I physically looked at the actuators of the: Blend door, Mode door and Recirculation door. They are all in working condition. But still it wasn't blowing hot from the vents.

So while I was under the dash looking at the actuators I decided to feel the hose going to the heater core that provides heat to the cabin.
The hose was not hot at all!! Funny, I was expecting to get burned.

I jumped out the car and looked at the engine bay and found the hose was bypassed from the heater core.
I think the owner did that because the heater core is leaking. I will find out soon enough when i reconnect it.

I'll be back!!


Got hoses connected to heater core and did a pressure test. Found out the heater core was leaking. Come to find out the customer just bought that van. Charged $600 to customer and had a new heater core installed.