Symptons-
Boil over, lost coolant, and false indication on temp gauage.
The electric coolant fans can be triggered by -
1) ECU/PCU - Low/high speed @ certain temps (205F-230F range)
2) HVAC - On high max cool
3) Disconnect the ECT to trigger open loop condition.
Caution - Make sure your Low/High speed coolant fans are working proper, the engine or transmission isn't very forgiving when it comes to heat damage.
Suspect - fan fuses, fan relays, ECT sensor, coolant fan resistor, or control module.
Anything missing on a 4-stroke engine can cause random misfires on random cylinders.
Don't always count on DTC's , Test's, and new parts!
Security System -
Air System - Air filter, Dirty throttle body, unmetered air leaks, Air Intake, IAT, MAF, or MAP sensor.
Fuel system - Bad fuel filter, relay,pump, or regulator.
Ignition system - ICM, COP's, plug wires, cam sensors, crank sensor, broken connector or signal wires on cam or crank sensors, or a bad ECU/PCU.
Exhaust system - Plugged catalytic converters.
Profile the Automobile by <year><make><model><mileage> , and see what routine maintenance might of been forgotten.
Example - fuel filer, air filter, dirty MAF sensor, or dirty throttle body.
Single misfires on signal cylinders -
Coil on Plug (COP)
Coil
Plug wire
Plug
Fuel injector
Bad compression
Broken fuel injector connector or signal wire.
Broken COP signal wire connector or wire
Always clean connections with CRC electronic cleaner + use dielectric grease.
The IPAD with a Sprint mobile hot spot service is the ultimate personal phone, gps, multi media, and entertainment system.
1- IPAD, 1- Sprint mobile Hot spot service and get free Google voice, Google Maps, Google +, Youtube, FB, Twitter, and WWW.
For a a small service fee, you can get Pandora, Netflex, and Hulu plus.
No Land Line phone service, No cable bill, No cell phone service, no Blue-Ray, DVD's, VHS, CD's, flash drives, cassette tapes, 8-track tapes, and LP's.